ferrisio Posted February 5, 2008 Share Posted February 5, 2008 Hi, just a quick query, I want to bridge my PSL VP-1216 amp to drive a sub. Unfortunately the company appears to be defunct and I don't have a manual. There is a bridge mode switch on the rear panel, so I know the amp is capable. Normally I am used to using the Ch 1 + output as positive, and the Ch 2 - output as negative on most bridgeable amps. Having said that this amp is slightly off-the-wall and there are no markings suggesting its okay on the speaker terminals, so I thought I'd just check here first to see if anyone can confirm or deny that thats the correct method for this particular amp. Link to comment Share on other sites More sharing options...
Peter Chivers Posted February 5, 2008 Share Posted February 5, 2008 If my memory serves me correctly, on these amps you need to use the Channel 1 + output as the + connection and the channel 2 + output as the - connection. The input simply goes to the channel 1 input/link connectors only. I have several VP16.. and VP20.. amps at the warehouse and will have another look when I am next there.Peter Link to comment Share on other sites More sharing options...
Rob_Beech Posted February 5, 2008 Share Posted February 5, 2008 This has confused me a little. I am not aware of any amps that use channel 2 -ve as the -ve although there must be some as you've used this before, so firstly I'd be interested to know which these are. Secondly, In bridge mode, most amps and as Peter says this one you have should be 1+ve for + and 2+ve for - This is because the polarity is reversed on channel 2. Link to comment Share on other sites More sharing options...
KevinE Posted February 6, 2008 Share Posted February 6, 2008 you need to use the Channel 1 + output as the + connection and the channel 2 + output as the - connection. I agree Peter & Rob. This is because most amps have the -ve side of each output channel down to chassis. Switching the bridge switch in converts the input to mono and inverts one phase on one channel so you're effectively running both outputs in series with a centre-tap that's not used for the speaker in this case. Thus one output channel pulls one side of the voicecoil high/+ve bus whilst the other channel pulls the other side of the coil low/-ve bus and vice versa, increasing the voltage swings. Link to comment Share on other sites More sharing options...
ferrisio Posted February 7, 2008 Author Share Posted February 7, 2008 Arrggghh!! Even though I clicked 'preview' first I still got it wrong! Sincere apologies to Peter Rob and Kevin, who are all of course right in that the load is connected across the positives for each channel. Having said that, when I switched the amp over and connected it it didnt work, and I discovered that Ch 2 is faulty!! Sod's law, innit... Thanks again for the replies, and sorry my mistake wasted your time. Link to comment Share on other sites More sharing options...
KevinE Posted February 7, 2008 Share Posted February 7, 2008 Oh Dear Is your amp fitted with the Norslo speaker relays? If so, check they're clean and the contacts are closing properly, this is a popular fault with the PSL's. Link to comment Share on other sites More sharing options...
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