GT-10B Bi-Amp?

[Htom_Sirveaux]

Hello, All, from the FNG.

I'm looking at the Boss GT-10B, but I need to nail down one item before making the plunge. It looks like you can bi-amp with this pedal (based on some info at Harmony Central and a look at the manual from Boss) but I'm not 100% sure (and I'd like to be before I plunk down this kind of money). So....

Just to clarify, I can connect my 1x15 amp to, say, the Left output, my 2x10 to the Right, and use Freq Divide in the Channel Select section to send the lower tones to the 1x15 and the mid to upper to the 2x10, right? And apply separate effects or the same effect to both outputs?

Thanks in advance.

[gumtown]

Hello Htom, Greetings and welcome !!
Yes, you could do that, it would be a matter of shuffling the chain order of effects after the channel split point, and either using stereo effects at the channel merge point or making the merge at the end of the chain, then selecting "Frequency Divide" as the channel mode.
Effects can be placed either in each channel or before the split to apply the same effect to both channels.

Check out GT-10BFxFloorBoard patch editor from the link in my signature below, it will give you a graphical representation of the GT-10 effects structure, and give you realtime editing when you get a GT-10B..

[Htom_Sirveaux]

Hello Htom, Greetings and welcome !!
Yes, you could do that, it would be a matter of shuffling the chain order of effects after the channel split point, and either using stereo effects at the channel merge point or making the merge at the end of the chain, then selecting "Frequency Divide" as the channel mode.
Effects can be placed either in each channel or before the split to apply the same effect to both channels.

That's good to know for sure (although now it's gonna cost me a couple
hundred dollars)

Check out GT-10BFxFloorBoard patch editor from the link in my signature below, it will give you a graphical representation of the GT-10 effects structure, and give you realtime editing when you get a GT-10B..

I have actually already DL'ed that last night, as I saw it recommended on another board (or maybe another thread here, I've looked at a lot of GT-10B stuff in the last 48 hours).

Thanks for the thorough (and rapid) response.

[Htom_Sirveaux]

The GT-10B arrived today, and it looks like you cannot bi-amp.

If you select Freq Divide as the Channel mode, low frequencies are processed through the effects for Channel A and higher frequencies through the effects for Channel B, but the two are combined and the resultant signal sent to both the L and R output jacks.

If you select Dual L/R as the Channel mode then channel A is output through the L jack, and Channel B through the R jack so that one effect can be sent to one amp while the other is sent to the other amp, but the split is not based on frequency. You would need a combination of Dual L/R and Freq Divide to do this, and those appear to be mutually exclusive.

So, there doesn't seem to be any way to send the low frequencies to the 1x15 amp while sending the higher ones to the 2x10 amp. Which would explain why Boss doesn't advertise bi-amping like Line 6 did with the Bass POD XT Live.

So, does it stay or does it go? It will drive both amps (albeit with the same signal) and, based on playing with it for just an hour so, the effects are the best I've ever heard in a multi-effects pedal, and the Line 6 pedal is out of print.

My guess is it's going to stay...

[Htom_Sirveaux]

The GT-10B arrived today, and it looks like you cannot bi-amp.

Or, possibly, I should spend more than an hour messing about with something this complex before deciding what it will and will not do.

I tweaked an existing patch and either got it to bi-amp, or at least it sure sounds like it is, and that's as good as.

[gumtown]

Sorry about that, i was sure it could be done with the freq divide.
How about placing the Send/Return effect just before the chain merge in freq divide mode, and use the S/R Send to the amp, and the L/Mono output to the other amp.
The S/R effect will interupt the signal from merging and will tap it's output from it's placement in the chain.

[dug dog]

I used Winisd to generate the frequency sweep from 20Hz to 2000Hz. I passed the signal out of my computer's audio interface into the Gt10B and back to an XLR input on the interface and recorded the results in Sonar.

That was Gil.green quoting me from another thread, but I was interested in this topic so I used the outlined method to generate a signal sweep from 10Hz to 4kHz and tried Gumtown's suggestion with a crossover point of 200Hz. The send/return thing did indeed output a low passed signal and the left sub output (XLR) put out a high passed signal. I could not get the left quarter inch outut to do the same thing, although that may have something to do with my system output settings and I'm too tired to muck with those right now. Also, the signal coming out of the XLR was WAY hotter than the one coming out of the send jack, but this too may have something to do with my system settings.

For the record, here are my system settings.



And here are the response curves:



I have adjusted the picture so that both waves are about the same size visually, but as mentioned, the XLR output (on the right) was much hotter. The big hump on the hi passed signal is pretty much dead on 200Hz which was the frequency I chose to divide the output.

I think this whole thing bears more investigation but, at the moment, I don't have a 2 channel power amp. I DO have a fEarful 15/6 that I could take the crossover out of which would allow me to run the lows to the Eminence 3015LF woof and the mids and highs to the 6 inch mid and horn tweeter. Hmmm.....