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Silver Member Username: Holt_champHtown, MI Post Number: 464 Registered: Oct-06 | ok i have a PANASONIC CQ-C8401U and the preamp and subwoofer output is 5 volts. so when i set the gain i should measure with a dmm until it is at 5 volts or am i wrong. |
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Gold Member Username: BlainewDiamonds in the back. Post Number: 1979 Registered: Nov-05 | u dont measure the speaker terminals.... there is in equation based on your volts from you batt, the the RMS rating of your amp that u need to get in order to get the right voltage on the speaker termianls, but the easiest thing to do is to know the input range on the amp (.02-8volts for example) and set the knob accordingly... |
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Silver Member Username: Holt_champHtown, MI Post Number: 469 Registered: Oct-06 | i thought that you had to match the head unit and the amp... so if i get the kx2500.1 what should the voltage be?? |
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Gold Member Username: JuliobSanto DomingoDominican Re... Post Number: 3785 Registered: Dec-05 | depends on your HU |
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Gold Member Username: N2audioLawrence, Ks USA Post Number: 1089 Registered: Mar-04 | you can't just set it at 5v by the dial and expect to get the best performance. 1) you don't know if the HU ACTUALLY produces 5v w/o clipping. 2) if it does it's probably only dynamically 3) it isn't difficult to set your gains for exactly the amount of power you want the speaker being driven to see 4) read this http://www.caraudio.com/forum/showthread.php?t=63933 |
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Silver Member Username: Holt_champHtown, MI Post Number: 470 Registered: Oct-06 | ok so i did (2500wrm x 2ohms)=5000 sqrt(5000)=70.7v how does that match the head unit is what i dont understand. should i just set it at 70.7 volts and call it good?? cuz if that is all i have to do then i dont want to bother with understanding it. i just want it to be right. thank you guys. |
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Gold Member Username: N2audioLawrence, Ks USA Post Number: 1093 Registered: Mar-04 | Just disconnect the sub(s) and play the 50hz 0dB tone on repeat. Turn the HU up to the loudest you ever listen at (the idea is to get maximum unclipped voltage at the pre-amp outputs, the rule of thumb is about 3/4 volume), measure the voltage at the amps speaker output and adjust the gain to ~71v. Shut down the HU, reconnect the sub. Now you know your amp will reach 2500w (when the music demands it) w/o clipping. That's really all there is to it. |
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Silver Member Username: Holt_champHtown, MI Post Number: 471 Registered: Oct-06 | ok ok i get it now thanks a lot. but how would i do it for a 2 channel amp?? |
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Gold Member Username: N2audioLawrence, Ks USA Post Number: 1100 Registered: Mar-04 | if it's for full range spkrs you do the same procedure but use a 1000hz tone. You only need to measure one channel since the gain controls them both. |