Anyone know how to bridge the old school 1992 US Amps high current? - diyAudio
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Old 4th June 2010, 07:13 PM   #1
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Default Anyone know how to bridge the old school 1992 US Amps high current?

I have an old 1992 model US Amps 50HCA and the neg wires are both at zero ohms between them leaving only the two positives.

This is confusing me.

L+ R+ = OPEN
L+ R- = OPEN
R+ R- = OPEN
L- R- = CLOSED ZERO

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Last edited by o. l. t.; 4th June 2010 at 07:17 PM.
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Old 4th June 2010, 07:50 PM   #2
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You can't bridge the output without inverting one input. Once you do that, you connect the load between R+ and L+ and leave the other connections open.
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Old 4th June 2010, 08:43 PM   #3
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You gotta be kidding.... I have to figure out a way to flip ONE rca polarity? I never remembered it being so much trouble back in 94 when I had this amp, but I don't remember much anyway..........
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Old 4th June 2010, 09:08 PM   #4
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Are you sure that the two shorted wires are the negative wires?
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Old 4th June 2010, 10:50 PM   #5
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Well they aren't negative exactly; they are common, or returns. Yes they are tied together and are not part of the bridged circuit.

You do need to invert one signal; some amplifiers may have a switch for that. I did this with a guitar amplifier I made from an old stereo amplifier - I added an IC to invert one signal. Works great.
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Old 4th June 2010, 11:19 PM   #6
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Unless they're marked as the negative speaker wires, one may actually a positive speaker wire. For bridged amps, there are two common wires. One is used as a positive speaker wire and the other is used as a negative speaker wire. The two 'live' wires (one positive and one negative) are used for bridging.
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Old 5th June 2010, 02:00 AM   #7
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clearly marked on these old US Amps

US Amps 50HCA - Amp Guts
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Old 5th June 2010, 03:18 AM   #8
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The two + did not produce sound. Even with one inverted.
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Old 5th June 2010, 09:34 AM   #9
amc32 is offline amc32  United States
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These amps were designed by Rodney and Dirk. Inputs are inverted and should be able to bridge. They are a few that I have seen that were modded from the factory for competition. Does your amp have a 4 gang dip switch in the audio section or small headphone "like" jack mounted near the rca's?
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Old 5th June 2010, 09:44 AM   #10
amc32 is offline amc32  United States
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Even the older models that came before this version "KA50HC" were able to be bridge. Use a meter find the two speaker wires that are common,then use the tow wires that are remaining to connect to your speakers. This amp came wired using esoteric street wires for speaker wires,so you bridged output will be from a pair of wires. One will be round and the other one will be square in shape.

Hope this helps
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