Hi all, I just installed a Wetsounds 250w amp and four Alpine 6.5s, two in the fairing and two in my lowers ( I had Kevin "Sincecrazy" on the roadglide.org forum custom make my speaker pods for my non-vented lowers, awesome pieces! Will post pics.) and wanted to make sure my gains were set reasonably equal with the four speakers. I didn't use the fade option on the stock stereo, just wired them R & L. I found this thread from the roadglide.org forum and used my voltmeter to "dial" in the gains. The values I used were the same as the post because of the same wattage amp and my speakers are now wired 2 ohms. I found the 50hz tone on the net, downloaded it to my iPhone and plugged into "Aux". If you can burn a tone to a cd, you would probably get a better result but I found a good tone and it worked on my mp3. I put the iPhone on repeat and let the tone play as I adjusted the setting to the 15.81 voltage. When you have one adjusted to the correct voltage, don't hook up the speakers yet to the amp unless you want to hear a very loud 50hz test tone. After it's all dialed in, connect the wires back to the amp and adjust bass/treble as you see fit with your favorite music. You may have your own way of tuning and as long as it gives you the sound you want, that's all that matters. I found that I now have equal sound coming from each side and it sounds better than when I tuned it with my ear. For those with different watt amps and ohm speakers just do the correct math with your numbers and give it a try.
"Turn the AVC off or less than two bars. Set your EQ to zero, turn the gain all the way down, set the crossover on the amp to full range. Turn the volume up to 3/4. Use a test cd and play a solid 50hz tone.... turn the gain up untill it distorts , then turn it down jut a little. And you're ready to go.
Or you can do the more accurate way of tunning the amp. Take your RMS wattage for one channel on your amp (125 watts) multiply that by the ohm's your speakers are wired to (2ohms) which in your case will equal = 250. Take the square root of that number (sqrt of 250= 15.81). Now take a volt meter or O-scope if your lucky enough to have one. Disconnect your speaker output and place the voltmeter cross one channel + and -. Play the 50hz test tone. Turn your gain up untill you have a voltage reading of 15.81. Then do the same for the other channel."
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Topic: Setting gains on an amp (Read 675 times)