How to rack ADA MP-2 and Marshall JMP-1 together

[sadinfish]

Please help me how to rack the ADA MP-2 and Marshall JMP-1 in all?
Thank very much!

 

[bduersch]

What do you want to do... run them in parallel? Switch between the two of them?

--B

 

[sadinfish]

Thank you your reply! Yes I want parallel

 

[Turumbar82]

but a stereo power amp and plug the ADA into one side and the JMP-1 into the other side and blend the volumes

 

[sadinfish]

Yes I know.So I very vexation for this!!
Please help me!!!!!!!!

 

[crane]

What is your actual setup ?

 

[sadinfish]

My setup is guitar in to ADA MP-2 mono out to the Marshall JMP-1 input.

 

[crane]

No power amp ?
What do you use for amplify your preamp ?

 

[ando]

My setup is guitar in to ADA MP-2 mono out to the Marshall JMP-1 input.

No, no, no! You said you wanted parallel, but that is in series.

You can't go from preamp to preamp (series) without introducing a lot of noise, distortion and tone mismatch.

What you need is a small line mixer to split your guitar signal into 2, then you have one input for the JMP1 and one for the ADA. Then you just take the outputs from each preamp and put them into the inputs of your stereo (or 2xmono) power amp. Easy.

If you don't have a line mixer, you could get away with using a stomp box with two outputs - like a stereo chorus pedal or similar. Make sure the effect is on bypass though.

Good luck and feel free to ask more questions.

 

[metal190]

There are a lot of great splitters, A/B/Y boxes, etc. out there. I use a Radial JD-7 that sends signal to 7 different preamps. No tone loss, and each output is isolated, so there's no ground looping, which is a must when running two preamps off the same power source. Incredible unit. You then have to figure out how to bring the signals back together, but there are several good options there.

Is this for live or studio use?

 

[jutsin]

Along the same lines of racking two preamps to use with one power amp...
would there be anything wrong with simply wiring up a small box with two 1/4" in jacks, that both connected to a single 1/4" out jack? That way you could switch preamps on the fly (with an a/b out from the guitar) and have both signals flowing into the same side of one power amp. Does this make sense? thanks

 

[francm]

If you have a single power amp and want to run both simultaneously or have the option of switching them in/out, a BOSS LS-2 pedal is the best solution. A simple Y cable will not work because it will load the output of your preamps, lowering their output and degrading the signal.

Edit - The Radial Switchbone ABY or Twin City are very nice units that can combine two amps/preamps BUT unlike the BOSS LS-2, it doen't allow for level control.

 

[ando]

Along the same lines of racking two preamps to use with one power amp...
would there be anything wrong with simply wiring up a small box with two 1/4" in jacks, that both connected to a single 1/4" out jack? That way you could switch preamps on the fly (with an a/b out from the guitar) and have both signals flowing into the same side of one power amp. Does this make sense? thanks

What you are saying makes sense, but you wouldn't want to do it that way because it would introduce noise into your system. Essentially while you were using one of the preamps, the other one is sitting there on like an amp that it switched on but with no guitar plugged into it - or worse still, like an amp with a lead plugged into it, but no guitar. You know how your amp hums until you actually plug the guitar into the lead? You could expect that sort of noise in your system. You could do what you say if you had a noise gate pedal before each preamp.

To do it in a more professional way you would have to have the switch between the preamps and the power amp. Sort of the same thing as what you said, but in reverse - 2 inputs, one output. This option is also better because the two preamps can't interact electronically with each other through the power amp. Power amps are designed to accept one line level source at a time, if you are sending two in without a proper mixer, the impedance going into the power amp isn't ideal.

 

[jutsin]

What you are saying makes sense, but you wouldn't want to do it that way because it would introduce noise into your system. Essentially while you were using one of the preamps, the other one is sitting there on like an amp that it switched on but with no guitar plugged into it - or worse still, like an amp with a lead plugged into it, but no guitar. You know how your amp hums until you actually plug the guitar into the lead? You could expect that sort of noise in your system. You could do what you say if you had a noise gate pedal before each preamp.

To do it in a more professional way you would have to have the switch between the preamps and the power amp. Sort of the same thing as what you said, but in reverse - 2 inputs, one output. This option is also better because the two preamps can't interact electronically with each other through the power amp. Power amps are designed to accept one line level source at a time, if you are sending two in without a proper mixer, the impedance going into the power amp isn't ideal.

thanks for the reply ando, that helps. Now, to add to this, what if I had things set up to where whenever I used one preamp, the other went to a channel that had everything set to zero- no volume, no gain, no bass etc etc essentially turning off the one pre amp while the other functioned and ran to the power amp. Would this solve any problems? thanks again!

 

[ando]

What you are saying makes sense, but you wouldn't want to do it that way because it would introduce noise into your system. Essentially while you were using one of the preamps, the other one is sitting there on like an amp that it switched on but with no guitar plugged into it - or worse still, like an amp with a lead plugged into it, but no guitar. You know how your amp hums until you actually plug the guitar into the lead? You could expect that sort of noise in your system. You could do what you say if you had a noise gate pedal before each preamp.

To do it in a more professional way you would have to have the switch between the preamps and the power amp. Sort of the same thing as what you said, but in reverse - 2 inputs, one output. This option is also better because the two preamps can't interact electronically with each other through the power amp. Power amps are designed to accept one line level source at a time, if you are sending two in without a proper mixer, the impedance going into the power amp isn't ideal.

thanks for the reply ando, that helps. Now, to add to this, what if I had things set up to where whenever I used one preamp, the other went to a channel that had everything set to zero- no volume, no gain, no bass etc etc essentially turning off the one pre amp while the other functioned and ran to the power amp. Would this solve any problems? thanks again!

If the two were still plugged into the single input of a power amp, you would get rid of the noise, but possibly not the impedance matching of the inputs. As I said, electrically speaking, the power amp is designed to "see" only one preamp at a time and the circuitry is matched that way.

Furthermore, doing what you suggested would involve more manual steps to switch between preamps - because not only would you have to switch the input to the other preamp, you would also have to switch the channel on the preamp that had been "silenced". Or maybe you meant you would get rid of the splitter switch altogether? either way, you's still have to turn one preamp "on" and another one "off".

I think you'd be better off with a switch for the preamps as I described above. It would work the same way the first one you suggested would work, only it's later in the chain - between preamps and power amp.

The more I think about it though, I think you would end up with a popping sound if you were switching between preamps - unless you had them electronically buffered somehow. Easiest way would be to use the first technique you suggested - a switchable splitter, two noise gate pedals, then a small line mixer between the preamps and the power amp so that the power amp receives the right impedance. That would turn out to be the cheapest of all the options I think

To summarise:

Guitar> A/B switch> Noise gate A/Noise Gate B> Preamp A/Preamp B > Line mixer > Power amp.

or

Guitar> A/B switch> Preamp A/Preamp B > Noise gate A/Noise Gate B> Line mixer > Power amp.

Hope that was clear.

 

[jutsin]

If the two were still plugged into the single input of a power amp, you would get rid of the noise, but possibly not the impedance matching of the inputs. As I said, electrically speaking, the power amp is designed to "see" only one preamp at a time and the circuitry is matched that way.

Furthermore, doing what you suggested would involve more manual steps to switch between preamps - because not only would you have to switch the input to the other preamp, you would also have to switch the channel on the preamp that had been "silenced". Or maybe you meant you would get rid of the splitter switch altogether? either way, you's still have to turn one preamp "on" and another one "off".

I think you'd be better off with a switch for the preamps as I described above. It would work the same way the first one you suggested would work, only it's later in the chain - between preamps and power amp.

The more I think about it though, I think you would end up with a popping sound if you were switching between preamps - unless you had them electronically buffered somehow. Easiest way would be to use the first technique you suggested - a switchable splitter, two noise gate pedals, then a small line mixer between the preamps and the power amp so that the power amp receives the right impedance. That would turn out to be the cheapest of all the options I think

To summarise:

Guitar> A/B switch> Noise gate A/Noise Gate B> Preamp A/Preamp B > Line mixer > Power amp.

or

Guitar> A/B switch> Preamp A/Preamp B > Noise gate A/Noise Gate B> Line mixer > Power amp.

Hope that was clear.

I see what you are saying. I do have a system to simultaneously switch the channels on both preamps with a single midi switch, and the A/B out on my looper pedal so those bases are covered. I'll have to give it a try and see which way works/sounds best. Any other advice/recommendations are appreciated!

 

[francm]

The more I think about it though, I think you would end up with a popping sound if you were switching between preamps - unless you had them electronically buffered somehow. Easiest way would be to use the first technique you suggested - a switchable splitter, two noise gate pedals, then a small line mixer between the preamps and the power amp so that the power amp receives the right impedance. That would turn out to be the cheapest of all the options I think

To summarise:

Guitar> A/B switch> Noise gate A/Noise Gate B> Preamp A/Preamp B > Line mixer > Power amp.

or

Guitar> A/B switch> Preamp A/Preamp B > Noise gate A/Noise Gate B> Line mixer > Power amp.

Hope that was clear.

The BOSS LS-2 does this (as I already posted earlier in this thread), without noise so no need for a noise gate.

 

[ando]

The more I think about it though, I think you would end up with a popping sound if you were switching between preamps - unless you had them electronically buffered somehow. Easiest way would be to use the first technique you suggested - a switchable splitter, two noise gate pedals, then a small line mixer between the preamps and the power amp so that the power amp receives the right impedance. That would turn out to be the cheapest of all the options I think

To summarise:

Guitar> A/B switch> Noise gate A/Noise Gate B> Preamp A/Preamp B > Line mixer > Power amp.

or

Guitar> A/B switch> Preamp A/Preamp B > Noise gate A/Noise Gate B> Line mixer > Power amp.

Hope that was clear.

The BOSS LS-2 does this (as I already posted earlier in this thread), without noise so no need for a noise gate.

I was assuming Justin wanted to do this on the cheap rather than buying specialist equipment (line mixers and noise gates being a dime a dozen), so I didn't pursue your suggestion. It's a good suggestion you gave though. It's amazing how many things have been invented that do exactly what we want. Sometimes it's hard to find them though.

 

[francm]

The more I think about it though, I think you would end up with a popping sound if you were switching between preamps - unless you had them electronically buffered somehow. Easiest way would be to use the first technique you suggested - a switchable splitter, two noise gate pedals, then a small line mixer between the preamps and the power amp so that the power amp receives the right impedance. That would turn out to be the cheapest of all the options I think

To summarise:

Guitar> A/B switch> Noise gate A/Noise Gate B> Preamp A/Preamp B > Line mixer > Power amp.

or

Guitar> A/B switch> Preamp A/Preamp B > Noise gate A/Noise Gate B> Line mixer > Power amp.

Hope that was clear.

The BOSS LS-2 does this (as I already posted earlier in this thread), without noise so no need for a noise gate.

I was assuming Justin wanted to do this on the cheap rather than buying specialist equipment (line mixers and noise gates being a dime a dozen), so I didn't pursue your suggestion. It's a good suggestion you gave though. It's amazing how many things have been invented that do exactly what we want. Sometimes it's hard to find them though.

The BOSS LS-2 is a $79 guitar pedal. That's a lot cheaper than buying all the gear suggested above.

 

[sadinfish]

Thank you everybody to reply me, I try every method,but the noise is too terrible.So I to give up.