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How do I bridge this Old School Zapco amp to get 200W x 2 @ 4 Ohms?

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Old Apr 18, 2008 | 09:14 AM
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Default How do I bridge this Old School Zapco amp to get 200W x 2 @ 4 Ohms?

Zapco Studio 204

4 x 50w @ 4 ohms (<0.05% THD)
4 x 100w @ 2 ohms (<0.1% THD)
2 x 200w @ 4 ohms bridged
Fuse: 40A







I want to use it to run my Focal components...
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Old Apr 18, 2008 | 09:33 AM
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According to the amp's labeling, you use the - and + that are right next to each other, the top row being 1 channel, the bottom row being the 2nd channel.

Like this very crude paint alteration I made:

Last edited by StreetOC192; Apr 18, 2008 at 09:35 AM.
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Old Apr 18, 2008 | 09:34 AM
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+ (or -) from left front and vise versa from left rear. That would be the Left chennel and do the same for the right. Just my guess, seems logical to me...
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Old Apr 18, 2008 | 09:34 AM
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Ha, I figured that out once I looked at it hard enough... I will lose stereo separation though correct?
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Old Apr 18, 2008 | 09:35 AM
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Originally Posted by Shyn
+ (or -) from left front and vise versa from left rear. That would be the Left chennel and do the same for the right. Just my guess, seems logical to me...
That won't work. The fron and rear channels aren't connected together.
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Old Apr 18, 2008 | 09:38 AM
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Originally Posted by phreaktor
Ha, I figured that out once I looked at it hard enough... I will lose stereo separation though correct?
Correct
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Old Apr 18, 2008 | 09:40 AM
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IC, i thought that it might retain your left/right balance. i figured that fading to the front with the bridge listed would balance it to the left and fading to the rear would balance to the right, that would annoy me
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Old Apr 18, 2008 | 10:05 AM
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Originally Posted by Shyn
IC, i thought that it might retain your left/right balance. i figured that fading to the front with the bridge listed would balance it to the left and fading to the rear would balance to the right, that would annoy me

Well what it bridges is the left/right front into 1 channel and the left/right rear into the other other channel, thereby losing the left/right stereo pairs. HOWEVER, if you connected the front/rear right to the top 2 RCA's and the front/rear left to the bottom 2 RCA's, you could retain your steroe pairs.
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