GTO 2000 (JBL) bridge question - diyAudio
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Old 12th August 2007, 11:21 PM   #1
mikee55 is offline mikee55  United Kingdom
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Default 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.

Thankyou

Mike
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Old 13th August 2007, 12:27 AM   #2
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The crossover switch has nothing to do with bridging the amp. It is bridgeable in High pass, Low pass and Full range.
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Old 13th August 2007, 01:01 AM   #3
mikee55 is offline mikee55  United Kingdom
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Default Hello there, I Am An Idiot

Good moniker

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

Mike
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Old 13th August 2007, 01:47 AM   #4
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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.
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Old 13th August 2007, 11:23 AM   #5
mikee55 is offline mikee55  United Kingdom
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Default Confused

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
I I
I I
- --LS-- +

I have switches
Mode
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
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Old 13th August 2007, 11:24 AM   #6
mikee55 is offline mikee55  United Kingdom
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Default Layout

Sorry about the layout.Doh
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Old 13th August 2007, 11:30 AM   #7
mikee55 is offline mikee55  United Kingdom
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Default 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.

Mike
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Old 13th August 2007, 12:36 PM   #8
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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?
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Old 13th August 2007, 12:46 PM   #9
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Are we talking about 2 different amps now?
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Old 13th August 2007, 12:49 PM   #10
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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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