AmmoJammo Posted October 19, 2012 Report Share Posted October 19, 2012 Two amps "strapped" but subs only connected to one amp or the other. (for testing) One amp has been blown numerous times, I've just finished fixing it... the other has never been blown or repaired... Repaired amp as slave did 148.1dB, Original amp as master did 146.4dB same volume on headunit. original amp clips sooner than repaired amp? unloaded output voltages: when original is master, the voltage is higher till clipping, where the repaired gets higher? (6volts maybe?) when repaired is master, voltage is higher across the entire volume range, and at clipping the repaired ends up ~20volts higher... (may have been more clipped than the first test) Its just doing my head in?! I'm thinking the "Original" amp has had issues since new! Link to comment Share on other sites More sharing options...
AmmoJammo Posted October 19, 2012 Author Report Share Posted October 19, 2012 "The difference Between first generation and 2nd generation Z1's...Is that there were some minor glitches in the first 80 or so made...That was the first batch first generation...about half went over seas and half here....They had some minor probs...like some input caps being to small...and some other minor bugs..not all were bad...but quite a few..." mine are serial numbers 10006 and 10069? Link to comment Share on other sites More sharing options...
AmmoJammo Posted October 20, 2012 Author Report Share Posted October 20, 2012 Did some fault finding today, and realised that it was the preamp section that was clipping.. not the amplifier section... Pin 4 of the X1 connector (in the middle of the pic) is the audio input to the amplifier controller board... (the output from the preamp) The first thing the signal does is pass through a 68k resistor (R3).... except on the "louder" amplifier, the resistor is 56k? it's been changed on the "quieter" amp... Swapped the 68k resistor for a 56k.... now the amplifier does 250volts peak to peak with the same amount of clipping as the other amp?!?! why was the resistor ever changed?!?!?!? Link to comment Share on other sites More sharing options...
Tim Lam Posted October 22, 2012 Report Share Posted October 22, 2012 this gettin' into some high tech shit o.O gl with repairs bro Link to comment Share on other sites More sharing options...
AmmoJammo Posted October 22, 2012 Author Report Share Posted October 22, 2012 It's fixed! that's what the last post was about.. it seems that for the 6 or 7 years I've owned this amp, it's always been down on power... apparently it was modded at some stage, I have no idea why :/ Link to comment Share on other sites More sharing options...
AmmoJammo Posted October 23, 2012 Author Report Share Posted October 23, 2012 "There are 2 types of z1 , one clipping at ~ 72V and the other model at ~92V, This output voltage are obtain whit no loud." ignore the guys poor English... wait... DD modified some of the amps so the preamp would clip before the output stage reached full power?!? WTF IS WRONG WITH YOU PEOPLE! Link to comment Share on other sites More sharing options...
Bump4life Posted October 23, 2012 Report Share Posted October 23, 2012 damn, thats some very intensive trouble shooting. nice work!! ive been looking at amps and seing how to do stuff like this. that is very cool!! Buyer/Seller Feedback Thread: http://www.stevemead...5015-bump4life/ MB C220 153 Trunk Car Build Log: http://www.stevemead...d/#entry1840136 MB C280 Ipad Dash SQ Build Log: http://www.stevemeadedesigns.com/board/topic/194484-bump4lifes-new-benz-tony-c-relay-kit-pictures-ce-electric-audison-front-stage-installed/ My SPL Log: http://www.stevemead...__fromsearch__1 BMW M340 xDrive Stock, for now. Corner Load 10" maybe soon. But does 10s in the 1/4... Best Scores out of a trunk 153.0 sealed legal full tilt clamped 5524 @ 42 hz 154+ windows down, 155+ kick Link to comment Share on other sites More sharing options...
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