- Recent questions in PreAmps, Signal Processors and Monitoring Hardware

Studio Channel Does Not Respond to Mic or Instrument Inputs

Wed, 31 Jul 2024 20:41:55 +0000

I recently pulled my old Studio Channel out of storage to try it with a modified recording setup. It fires up (power light goes on) but I get no VU response or audio output from either input. Preamp gain is up. Changing settings on Tube Drive and Compressor make no difference. Dead Preamp?

Does the micro-station bt engage a crossover when sub is plugged in?

Tue, 02 Jul 2024 01:18:38 +0000

Does the microstation bt engage a crossover when a sub is plugged in?

What frequency range are sent to the sub. And what frequency range is sent to the speakers when a sub is plugged in?

Central Station Plus external talkback mic VERY QUIET

Thu, 23 May 2024 16:04:46 +0000

I have a brand new Central Station Plus. My normal talkback mic is a Shure SM7B, which I plugged into the external talkback mic jack on the back of the central station, and I pushed the button that enables the external talkback mic. I thought that the external mic option was not working, as I could not hear anything through headphones from that mic. I discovered that for the remote to allow the talkback mic to work, the volume control on the central station itself had to be turned up to max volume, and the volume control on the remote had to be turned up to max volume. At that point, I could barely hear myself talking through the SM7B. So I replaced the SM7B with a Shure SM58. With both volume controls turned all the way up, I do now hear myself talking through the talkback mic, but only if I get right up on the mic....3" away, I can barely hear myself.

Is this normal behavior??? I can live with the volume with everything turned up, but it is not ideal, and knowing this, I would never have bought this unit in the first place. Is there anything I can do to increase external talkback mic volume, and also, what is the recommended mic to be used as an external talkback mic?

R65 Acoustic tuning LEDs Flashing and speaker wont switch on

Tue, 21 May 2024 05:26:09 +0000

When I plug the AC power supply in and switch monitor on, my "Acoustic tuning LEDs flash. The front LED power supply indicator isn't on, and neither is the audio coming from sound. It apears to be a power fault, though I have tried multiple AC leads, even one that is successfully powering my other monitor.

My audio signal chain is MAC>Audient Interface > monitor. NOTE: It works fine with my other monitor. The issue occurred sporadically and I haven't altered my setup.

I have supplied this to PreSonus Support, yet just seeing if this is a common issue or if anyone has a solution. Cheers

Where can I find HD7 headphones frequency response graphic?

Sat, 09 Mar 2024 14:13:59 +0000

I want to have this information for research purposes.

Presonus 1810c, all input on the back (5,6,7,8) have Left softer than Right. Swapping L and R changes nothing

Fri, 16 Feb 2024 14:15:52 +0000

I plug in TS cables in 1,2,3 and 4 no problem at all. Levels are fine. I plug them in 5,6 and 7,8. In stereo setting Left is less loud than R. In mono same. I pan the L to the Left and I pan R to Right but it's completely not centered. Seems to be sort of centered when I pan R in the middle.
Interface has latest Frimware and I'm running the latest version of UC.

Can I use speaker output C to play back through a home stereo?

Mon, 29 Jan 2024 16:10:37 +0000

Hello,

My question: Can I connect output C from a Central Station to a home stereo amplifier and listen to the playback through regular home speakers? I asked this before and was told that - yes - I could do that by connecting a stereo TS to RCA cable. I tried this and it doesn't work. Do you have any advice?

Thank you,

Mitch Pariseau

No sound playing via Studio 24c on Mac

Tue, 23 Jan 2024 15:47:32 +0000

Hi there,

My new-bought Studio 24c is indeed recognised by my MacBook Pro 2019 (with macOS Catalina) : the light is blue). I can see the level moving in the outpout bargraph when strumming my guitar, but no sound is playing through the Mac speakers, or my Blutooth cask...

Any idea, kind experts ?

Many thanks for your tips,

Ground loop/electrical noise with Microstation BT

Mon, 01 Jan 2024 00:04:22 +0000

I own the micro station BT as a monitor controller for my ES-9 euro rack modular interface - which lacks a volume controller for the main output) and I use the bluetooth feature extensively. My monitors are presonus eris 6 pro and everything is connected with balanced cables and supports balanced in/out

I have a ground loop noise that is not affected by the Microstation main volume control knob - it becomes evident as soon as the modular system is turned on - even if the microstation volume is muted and knob is at zero.

This makes me think the problem is electrical in nature. It sounds like noise with a high pitched whining component - like USB noise.

I realise this is common and I have tried some simple things with no effect (trying different power sockets etc)

Removing the microstation from the equation definitely improves things. I guess it has an amplifier which is boosting the bluetooth/line in signals and therefore electrical noise?

Is there any USB power cable ground-lifter or similar device that I can try on the USB power cable?

Feedback / Sensitivity using TubePre v2 with consender mic into Acoustic Guitar amp

Wed, 15 Nov 2023 21:12:34 +0000

I am very new to this type of equipment so I apologize in advance for my lack of expertise in the sound arena. My situation is this. I have a live event coming up. I have an acoustic guitar connected to my Fender Acoustic 100w amp which allows for two inputs. I have my acoustic guitar connected to input 1 via 1/4 inch and I have a condenser mic connected to the TubePre v2 via XLR. I have the TubePre output connected to input 2 on the guitar amp via XLR as well. I have the drive and gain levels on the Tubepre at about 25%. I have the 48V Phantom power and 80hz options selected. I am able to play guitar and have singers sing into the mic with no issues at fairly low amp levels (3). If I try to bump up the volume on the amp for the vocals, I start to get noise. The setup seems very sensitive. Last year I had a dynamic microphone and had no issues and I had that input volume on the amp at 9 in order for folks in the hall to hear it. Now having a condenser mic with the Pretube, I would like to be able to increase the volume for the mic for the performance (doesnt need to be at 9) but want to eliminate any chance for noise or feedback during the performance. Any suggestions from the sound experts out there? Thank you so much for your time and assistance.

Ableton external hardware audio routing

Sun, 05 Nov 2023 21:03:53 +0000

Hi!

I own the presonus studio 1824c, an external compressor and my DAW is ableton live 11. I was recently windows user and I routed everything first from the universal contol, mixers etc. and ableton was able to use properly the external audio effect. Now on my mac I routed exatly the same on my UC and the I/O in ableton and the external audio effect only receives output signal but no input signal.

Select second microphone

Wed, 25 Oct 2023 09:48:13 +0000

I have a Studio 26c, I connected a condenser microphone to the first input, a dynamic one to the second. When I click the Line button it always flashes only on the first microphone and I don't understand how to select the second. Can someone help me please?

What is the +-dB tolerance of the PRM-1 microphone's flat frequency response?

Fri, 20 Oct 2023 16:48:52 +0000

I'd like to use the PRM-1 microphone for free field measurement of loudspeakers, and I'd appreciate a figure for the tolerance of their flat frequency resoponse.

trying to record from a lap top to my studio one

Sun, 27 Aug 2023 15:56:54 +0000

there is no signal when you arm to record

Which cable should I use to connect an external preamp to a PreSonus Studio 24c? (XLR/TRS?)

Tue, 22 Aug 2023 19:44:43 +0000

I already get a line signal from my preamp. I've tried both cables, and the XLR cable somehow seems louder. I just want to know how to do it 'the right way'.

How do I get my headphones to work with Audiobox?

Mon, 12 Jun 2023 17:46:42 +0000

Headphones not working as output but can use line out to speakers

Serial Numbers NOT 20 or 24 digits

Fri, 12 May 2023 01:34:10 +0000

I got a PreSonus audio interface and bookshelf speakers - but the serial numbers are only half as long as the 20 or 24-digit requests.

What can I do?

Is it OK to connect my 24c (TRS) to my iLoud Micros (RCA)?

Thu, 27 Apr 2023 08:06:17 +0000

I have a Presonus 24C interface and a pair of iLoud Micros. The 24C has TRS outputs and the iLouds have RCA, is it OK to connect these two using a TRS-RCA cable, given one is balanced and the other isn't? Any help with this would be really appreciated.

Thanks!

Can I get a wiring diagram for the custom 2 XLR to 5 pin mini-XLR cable for the HP2?

Sat, 25 Feb 2023 01:33:21 +0000

My Hp2 cable went bad. Since you don’t have any spares for me to buy, can you provide for me a wiring diagram so I can make it myself? Thanks.

Digimax 48 Jumper Diagram

Tue, 21 Feb 2023 17:34:51 +0000

Hi -

I'm wondering if anyone has a copy of the jumper diagram for the older Digimax 48. Supposedly a paper copy was included in with the DMAX006 & DMAX007 breakout cables. I've done a web search for an electronic copy, and it's not on the presonus.com website. After reaching out to product support I got an automated response...which claims that because the product is EOL they don't even have the diagram available anymore. I assume this has to be an error with a comapny as big as Presonus, as most of the manufacturers keep all their legacy documentation and drivers out on the web ad infinitum.

Anyhoo - any help would be appreciated - thanks much if you can!

Headphones and power amps

Sat, 18 Feb 2023 11:09:47 +0000

Hi all, I recently bought a StudioLive 24R Mixer. I need to connect headphones to 4 of the 12 Mix outputs 6.3 mm jacks for monitoring. I have already tried to connect headphones but (as it should be) only one channel can be heard when MONO. My question is this: if I modify a stereo cable by soldering the 2 R and L channels on a single pole, do I risk damaging the power amplifiers of the mixer?

I don't need to hear stereo through headphones

Thank you

can Studio 24c line out be connected directly to speakers or does it need an amplifier first?

Tue, 10 Jan 2023 16:34:09 +0000

can Studio 24c line out be connected directly to speakers or does it need an amplifier first?

Presonus 1810c, input line 5/6 very quiet

Mon, 09 Jan 2023 03:49:04 +0000

Using my Moog Subsequent 37 in line inputs 5 or 6 the volume is very low even though the synth is all the way up and I tried different cables. The synth works fine on the front panel inputs but why not on the back, on 5/6? the synth is a permanent part of my studio and therefore I want the inputs to go in the back. The front inputs I want reserved for instruments that I swap out frequently.

The UC mixer is all standard setting like 1/2 and 3/4. Is there a reason for this behavior on Line In's 5 and 6, or is my Audio Interface going bad?

Thanks,

EVan

Why is my Studio1810c not interfacing with Windows10 correctly?

Sun, 01 Jan 2023 13:49:42 +0000

I am attempting to use a Presonus1810c with my windows laptop. the Sound manager in Control Panel and the sound menu in the Settings menu do not see the 1810c as single device, but rather it lists all the inputs and outputs individually. (Main Out 1/2, Line in 1/2, SPDIF in, Etc.) So when i try to use any program like Studio One or Davinci Resolve Fairlight, those programs will only see the one channel selected in control panel, meaning I can only use two of the four XLRs at a time and only one output at a time, unlike on my workplace Mac which sees the 1810c as a single device and programs can see ALL inputs and outputs simultaneously. I should also note the Universal Control is installed.

What's happening and how do I fix this?

Presonus Central Station Aux + TRS/Digital Input Simultaneously

Mon, 05 Dec 2022 21:34:04 +0000

Hello. Currently I have a ********* Control2USB monitor controller with 2 pairs of monitors and a sub-woofer. I also have an Amazon Eco Device hooked up to one of the aux inputs of the controller so if I want to listen to music there, I can without having worry about levels being off of even having my computer on.

I'm looking at the Central Station with controller to replace the Control2USB to free up some desk space. If I run my main sound card (in this case a Scarlette 18i20 3rd gen) to TRS 1 or SDPIF, could I connect my Amazon Echo to the Aux and have the aux signal run in parallel with the main sound card signal for listening to music and playing along?

Studio Channel Tube In Effects Loop

Fri, 28 Oct 2022 14:51:38 +0000

Can this unit be used in the effects loop of a bass amp to provide additional tube drive and compression?

Can both the mic and line inputs be connected on the Studio Channel or is it only one or the other?

Mon, 12 Sep 2022 12:20:29 +0000

I'd like to keep a mic cable connected to the Studio Channel but still have the TRS input and output connected to my patchbay. When I try this, the mic doesn't work but when I disconnect the TRS input, the mic works. Seems like the TRS connection disables the mic input. Just need to know if having both connected is possible so I won't have to keep crawling behind my desk. Thanks.

Headset HD7 Volume constantly changing

Thu, 18 Aug 2022 16:58:28 +0000

I've a HD7 Headset, and I changed my PC a week ago.
Here's my problem, the volume for the headset is changing at random times. Yesterday, i could set the desktop volume to 100 without getting my ears on fire. But today, i have to set it to 20 beacause it's too loud. This problem was almost the same on my previous PC. Why ?

I'm on Windows 11
With a HD7 Headset

Thanks if you can help me.

P.S : I'm french so... if you don't understand me corectly, you know why now.

Are the preamps in the audiobox ione and itwo the same as the ones on the usb 96?

Wed, 10 Aug 2022 04:55:48 +0000

Hi I was wondering if the preamps where the same in the audiobox 96 and the ione and itwo.

Is there a way to change central station speaker switching so that all 3 buttons are active at one time?

Wed, 03 Aug 2022 15:48:05 +0000

I notice that on the new V2 presonus monitor controller it's possible to alter the function of the speaker control buttons to have buttons A and B work either together (Both speakers on) or alternately ( speaker A OR B but not both) by holding down SPKR A button before switching on machine or SPKR B before switching on. Does this also work on Central Station as currently I understand you can only have A or B but not both?

Studio 24c -Backing track bleeds onto vocal track - not a closed back or semi closed back headphone issue

Wed, 27 Jul 2022 18:10:08 +0000

My setup is -
Windows 10
Shure Sm7b
cloudlifter
Presonus 24c
AKG K240 / Sennheiser HD280 pro
Audacity/Ableton/Protools

The problem is, every time I want to record vocal over a backing track, the backing track bleeds into the vocal track. This is not a headphones issue it seems, because I can unplug them and monitor using external speakers with no bleed. I can kill the gain on the backing track and it fixes the problem, but defeats the purpose. I can also distance myself from the mic and there is no change in the waveform of the bleed. It seems to be an issue with settings that I just don't know about, maybe a driver, or something else. I've created a tech support ticket at Presonus but they haven't gotten back to me in the timeframe they said they would. Trying this approach. Any help is appreciated.

Pierce

Presonus Eureka T1 Wire Lead Replacement Bulbs

Sun, 10 Jul 2022 01:30:36 +0000

Greetings,

Are the three VU meter bulbs 10V T1 (7218) or 12V T1 (7219) wire lead incandescent bulbs? I have blown bulbs on one of my Eurekas and need to replace and solder in new ones. There is extremely limited information regarding this issue, no available schematic, and many users on other forums facing this issue. Assistance would be greatly appreciated regarding obtaining replacement bulbs (Digi-Key, Mouser, etc.). Thank you.

I just bought the same preamp rack but can't get it to work with my 1824c into Protools?

Fri, 03 Jun 2022 21:50:49 +0000

HI. So I bought a ********* ADA8200 8 In/8 Out ADAT Audio Interface with MIDAS Mic Preamplifiers but can't seem to get it to talk to my 1824c. The interface is working, preamps are getting signal, nothing through headphones, nothing in Protools. I've tried both as slave and as master, but still nothing. Get sound from the interface preamp, but nothing via adat.

Presonus 1824c - Channel input/output control

Tue, 19 Apr 2022 12:31:27 +0000

Simple question, before investing in this unit:

I need to hook up six line inputs to the Presonus 1824c. Can I output each of these inputs as six discrete/mono outputs to monitors, and control the volume levels of each discrete output separately?

HD10BT question. How to turn off beep sound when volume up & down while using bluetooth pairing?

Mon, 18 Apr 2022 05:17:00 +0000

Product is HD10BT. How to turn off beep sound when volume up & down while using bluetooth pairing? There is no instruction to turn off the beep sound in the manual.

My Panasonic SA-HE100 Headphone output drives my headphone, but not the HP2

Sat, 02 Apr 2022 15:03:28 +0000

I have a PreSonus HP2 with the dual 1/4" TRS/5-pin XLR input cable. I want to use it to mix the analog stereo headphone output of my Panasonic SA-HE100 DAV Receiver with the stereo output of my Universal Audio Ox Box. The headphone output on the receiver easily drives my DT990Pro Open-back Studio Monitor Headphones (127-Ohm), but cannot drive either input channel on the HP2. There is no problem with the Ox Box stereo headphone output driving the HP2. I'm using the 9V power supply that came with the HP2.

monitoring hardware having issues

Sat, 26 Mar 2022 12:06:34 +0000

I'm having issues with the output of monitoring hardware, is there any plugin or support driver needed?.

MicroStation BT inputs - TRS in and Aux in at the same time?

Mon, 07 Mar 2022 02:24:21 +0000

I couldn't find my answer in the documentation notes, so trying here. I want to purchase the MicroStation BT as a Monitor Controller - but have a couple of questions about its connectivity. Basically I'm looking for a simple monitor controller for my Pioneer DDJ1000 controller and Mac computer to my Studio Monitor speakers.

1. setup would be DDJ1000 plugged into TRS in, and Mac computer plugged into Aux in. Question is will I get audio to my Speakers at the same time, or does Aux in override the TRS in like some other passive monitor controllers?

2. Is the power switch on the back just for powering bluetooth? example if its switched off or not powered, is the device passive? Will I still get audio to my speakers from the DDJ1000 and Mac?

Request - Add Mute All button to UC Surface and UC Control

Thu, 03 Feb 2022 22:43:10 +0000

The Revelator io24 has a Mute all button at the bottom right of the unit.

Request that a software button be added to do the same function in UC Control and UC Surface.

Currently when you push the hardware button, the main volume turns red. Would be nice to have a virtual button to change that state via software/app.

Eris HD10BT paired with macbook, no sound when using with USB interface

Sun, 23 Jan 2022 18:46:01 +0000

Hello All,

The problem and question: When attempting to use newly purchased hd10bt headphones via blue tooth with my macbook I get no sound when trying to use it in the following configuration. The signal chain is this:

guitar into MOTU M4 USB'd to macbook. HD10Bt's to be used as wireless monitoring. The audio midi set up is selected as motu m4 for input and eris hd10bt as output. The HD10BT and Mac are paired via bluetooth.

the phones do work as i can listen audio via bluetooth from the macbook when NOT using the motu m4 inteface. I can watch youtube, play itunes etc and listen just fine.

What i am trying to do is omit a few cables by using the wireless headphones to free up movement when playing guitar into the Mac. For song writing and practice I use a small setup as described above. I use Superior drummer standalone and Neural DSP amp modeler in stand alone. everything works fine when using motu m4 headphone out. But when trying to use the HD10Bt wirelessly, I get no audio in the headset. Am i missing a setting somewhere? anyone else experience similar?

any help is appreciated. Thanks!

Home Studio Setup

Fri, 14 Jan 2022 21:05:50 +0000

I hope I have the right category here so here goes.

I am setting up a home studio for the band I play in, we're along the lines of Magnum/Whitesnake/Europe etc

We're an older bunch in our 50's but are still keen to know our live performance is good so want to be able to record the band simultaneously/live.

The drummer uses a Roland TD50x, the rest of us are standard guitar, Bass, Keyboards, Vocals etc

Can I use either the Studio 1810c or 1824c recording the drums either from its stereo out or midi? Also being more old-school can I use a fader port (8 or 16) to have that organic relationship with Studio One pro and/or is there a single product that is the interface and fader port? I'd like to stick with Presonus hardware and we're using Studio One Pro at the moment

Sorry for all the questions but if anyone could impart their better knowledge/experience to us, we'd be ultimately grateful

Thank you in advance.

Can the M7 microphone work with an Iphone?

Tue, 11 Jan 2022 11:03:09 +0000

Hello, I am a complete microphone novice!

If I used an XLR to 3.5mm jack lead with the M7, could this then go directly into an Iphone and record without further software? (with a 3.5mm to lightening cable converter).

Thank you!

How can this be fixed on a Windows PC?

Thu, 30 Dec 2021 18:17:57 +0000

I am having the same issue on my windows PC. I’ve tried uninstalling and reinstalling UC with no luck. Has anyone found a solution for PC?

is it possible to bypass the pre-amps on my 68c to connect an external pre-amp?

Mon, 25 Oct 2021 18:17:08 +0000

I want to connect an external pre-amp to my 68c which as pre-amps on it's 4 inputs. is it possible to by-pass these and just use the 68c AD converters for the external pre-amp?

Can I buy replacement windscreens for the PD-70?

Mon, 18 Oct 2021 02:00:41 +0000

I would like to get a replacement for the foam windscreen that comes with the PD-70 microphone. Are they for sale anywhere online or can I order directly from PreSonus?

Revelator io24. Seperate audio tracks in OBS

Mon, 04 Oct 2021 16:43:46 +0000

Hello. can i have seperate audio tracks in OBS when recording with the revelator io24? Im using voicemeeter to seperate game audio, mic audio and discord audio so i can edit them on seperatly. Is that possibly with the revelator io24 or do i still need voicemeeter for that? i cant find any information on this.

Mute/unmute for MainOut & Phones on Revelator io24

Tue, 14 Sep 2021 11:17:59 +0000

The main monitors can be muted/unmuted on the hardware front panel only. I would like to see this option in the Universal Control software as well. Also, it would be great to have this functionality for the headphones as well as an independent control.

DigiMax DP88 Replacement

Mon, 06 Sep 2021 14:24:18 +0000

Currently have a Studio 192 and wanted to know if a replacement piece of hardware will be released to replace the EoL DigiMax DP88 to expand the inputs on the 192 interface.

Thanks!

Will my Isolation 24c work with a studio 68c in conjunction? therefore giving me 6 simultaneous tracks and xmax preamps?

Wed, 11 Aug 2021 02:49:49 +0000

I'm just hoping I can daisy chain the two together and be able to use all 6 inputs in my daw at the same time. Please let me know.

Thanks,

Rich

can i use the eris 4.5 as a passive speaker and plug into tube amp?

Tue, 10 Aug 2021 09:32:44 +0000

can i use the eris 4.5 as a passive speaker and plug into tube amp?

sorry if its a dumb q

- Recent questions in PreAmps, Signal Processors and Monitoring Hardware

Studio Channel Does Not Respond to Mic or Instrument Inputs

Does the micro-station bt engage a crossover when sub is plugged in?

Central Station Plus external talkback mic VERY QUIET

R65 Acoustic tuning LEDs Flashing and speaker wont switch on

Where can I find HD7 headphones frequency response graphic?

Presonus 1810c, all input on the back (5,6,7,8) have Left softer than Right. Swapping L and R changes nothing

Can I use speaker output C to play back through a home stereo?

No sound playing via Studio 24c on Mac

Ground loop/electrical noise with Microstation BT

Feedback / Sensitivity using TubePre v2 with consender mic into Acoustic Guitar amp

Ableton external hardware audio routing

Select second microphone

What is the +-dB tolerance of the PRM-1 microphone's flat frequency response?

trying to record from a lap top to my studio one

Which cable should I use to connect an external preamp to a PreSonus Studio 24c? (XLR/TRS?)

How do I get my headphones to work with Audiobox?

Serial Numbers NOT 20 or 24 digits

Is it OK to connect my 24c (TRS) to my iLoud Micros (RCA)?

Can I get a wiring diagram for the custom 2 XLR to 5 pin mini-XLR cable for the HP2?

Digimax 48 Jumper Diagram

Headphones and power amps

can Studio 24c line out be connected directly to speakers or does it need an amplifier first?

Presonus 1810c, input line 5/6 very quiet

Why is my Studio1810c not interfacing with Windows10 correctly?

Presonus Central Station Aux + TRS/Digital Input Simultaneously

Studio Channel Tube In Effects Loop

Can both the mic and line inputs be connected on the Studio Channel or is it only one or the other?

Headset HD7 Volume constantly changing

Are the preamps in the audiobox ione and itwo the same as the ones on the usb 96?

Is there a way to change central station speaker switching so that all 3 buttons are active at one time?

Studio 24c -Backing track bleeds onto vocal track - *not* a closed back or semi closed back headphone issue

Presonus Eureka T1 Wire Lead Replacement Bulbs

I just bought the same preamp rack but can't get it to work with my 1824c into Protools?

Presonus 1824c - Channel input/output control

HD10BT question. How to turn off beep sound when volume up & down while using bluetooth pairing?

My Panasonic SA-HE100 Headphone output drives my headphone, but not the HP2

monitoring hardware having issues

MicroStation BT inputs - TRS in and Aux in at the same time?

Request - Add Mute All button to UC Surface and UC Control

Eris HD10BT paired with macbook, no sound when using with USB interface

Home Studio Setup

Can the M7 microphone work with an Iphone?

How can this be fixed on a Windows PC?

is it possible to bypass the pre-amps on my 68c to connect an external pre-amp?

Can I buy replacement windscreens for the PD-70?

Revelator io24. Seperate audio tracks in OBS

Mute/unmute for MainOut & Phones on Revelator io24

DigiMax DP88 Replacement

Will my Isolation 24c work with a studio 68c in conjunction? therefore giving me 6 simultaneous tracks and xmax preamps?

can i use the eris 4.5 as a passive speaker and plug into tube amp?

Studio 24c -Backing track bleeds onto vocal track - not a closed back or semi closed back headphone issue