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mikee55 12th August 2007 11:21 PM

GTO 2000 (JBL) bridge question
Hello all,

I have a GTO 2000, 400w amp from JBL. I would like to use its 2 channels in bridge mode, but, would like to use my own crossover and skip bass boost. Does it have to be switched into LO (lowpass) mode to run in bridge?

Oh, and as a side order, can you tweak these things in any way. Quality not quantity, if you please.



I Am An Idiot 13th August 2007 12:27 AM

The crossover switch has nothing to do with bridging the amp. It is bridgeable in High pass, Low pass and Full range.

mikee55 13th August 2007 01:01 AM

Hello there, I Am An Idiot
Good moniker:D

Me sometimes idiot too, pardon my ignorance, can you tell me, how does the amp know whether to bridge or not? There is no switch. I have wired Left and Right Line Out to my sub, my single driver is wired +Left and +Right, L- and R- are not connected, okay, how does the amp know to sum left and right input and drive bridge. Is it the speaker wiring which tells it to either bridge or be Stereo/2 channel?

Gratefully appreciated


I Am An Idiot 13th August 2007 01:47 AM

If your amp has no bridge switch on it, the bridge wires will be a positive wire from one channel and a negative wire of the other channel. If you used both positive wires it is not bridged. connect the wires to left positive and right negative. If that does not work try left negative and right positive.

I am sure your amp is capable of running 2 ohms per channel. This means it will run no lower than 4 ohms bridged.

mikee55 13th August 2007 11:23 AM

This is whats displayed on my amp, I'm using in my Lounge, its a 4 channel job. No brand.Cheapy

R+ -R 2CH L+ -L
+MONO- 3CH L+ - - +R
L+ - - +R 4CH L+ - -+R
- --LS-- +

I have switches
S1 S2
2ch ON ON
3ch OFF ON
4ch Off OFF
I have it ON ON and speaker wired (LS) on +MONO-

How does that look to you?

Cheers Mike:confused:

mikee55 13th August 2007 11:24 AM

Sorry about the layout.Doh:)

mikee55 13th August 2007 11:30 AM

Back to the GTO2000
Hello, The GTO has both Minuses connected together according to my meter, I was just about to wire it up, and thought I better take a look.


I Am An Idiot 13th August 2007 12:36 PM

The mode switches are obviously a bridge switch. So yes the 2 positive wires are how you bridge it.

How are the RCA jacks labeled? Just left and right? or does one of them say mono or bridge also?

I Am An Idiot 13th August 2007 12:46 PM

Are we talking about 2 different amps now?

richie00boy 13th August 2007 12:49 PM

For an amp with no switch to select bridge mode, you must feed both the left and right channel with the same signal. The bridging is achieved internally by one channel being non-inverting and the other being inverting. Hence why you connect to +ve on one channel and -ve on the other.

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