Provience
Kill!
Thought this thread already existed, couldn't find it 
If somebody knows what thread I was thinking of, let me know and i'll delete and toss all this in there.
references: How to Tune an AMP with a Multimeter - electrouniversity.com and Using test tones to set amplifier gain were the two most useful things
Wanted to retune the radio in my pickup, try it out for a bit and mess around with it some more later. Cheap-o setup stuff.
DOVOX single DIN digital media reciever
AUDIOTEK AT-EQ700 7 Band Equalizer
Rockford Fosgate R400-4D amp
CRUNCH CS5768CX 5x7 speaker for dash
jensen octane XDA92RB amp
rockford fosgate 10" sub R2D2
Crunch CS65C component speakers for door
General rules from projectwin:
Sound deadening is of utmost importance
get the tweeter mounted as high as possible, ear level if you can.
Use digital signal processing and time delay to ensure the cleanest possible sound.
Avoid clipping at all costs, oscilloscope is the easiest way to find amp output waveform clipping.
welp, don't have all those tools so going with the next best thing.
1) Download a frequency/signal generator to your telephone.
play.google.com
2) Ensure all the equalizer stuff is flat and the gain knobs on the amps are all the way down, crossover and filters off
3) pick a channel of speakers to tune and unplug the others, full range are easiest to start with.
4) according to the crutchfield article, use 100,400,800,1000 Hz tones. start low on volume and turn up the receiver until the tone changes, it will be generally obvious. The lowest setting before it changes is where the receiver clips the signal, don't go above that.
4b) for the sub, same thing just use 40 or 60 or 80hz as you see fit and depending on your speaker.
you could stop there and use the same method several times for adjusting gain next, but that is loud and annoying. going to the electron university article and the A/C voltmeter is much quieter.
1) determine your target AC Volt output
4 ohm speaker (depends on the speaker and how it is wired)x 250 watt target (based on the product manual output RMS for my amp) = 1000 then square root = 31.622 volts A/C target for subwoofer at 50hz 0db test tone
4 ohm x 75 watt target = 300 then sq rt = 17.32 volts <-target for my mids (and 100hz tone)
100w is 20vac
200w is 28.28vac
2) Disconnect the speaker wires at the amp or the speaker, whichever end is easier to get to
3) play your test tone and set the receiver at your max level without signal clipping.
4) put the leads on the speaker wires, and adjust gain until your target number is met.
To set the crossover
1) once you've reached your gain, adjust your frequency tone to your desired crossover tone. 80hz is apparently common, so that's what I went with.
2) adjust the crossover knob until you reach 1/2 of your output number, 8.7 VAC in this case.
and repeat for all your channels. Turn it on and adjust equalizer generally through reductions if you feel the need, but this should keep you in the safe and easy way to get everything moving. Much lower risk than just tossing it in there and making a guess
If somebody knows what thread I was thinking of, let me know and i'll delete and toss all this in there. references: How to Tune an AMP with a Multimeter - electrouniversity.com and Using test tones to set amplifier gain were the two most useful things
Wanted to retune the radio in my pickup, try it out for a bit and mess around with it some more later. Cheap-o setup stuff.
DOVOX single DIN digital media reciever
AUDIOTEK AT-EQ700 7 Band Equalizer
Rockford Fosgate R400-4D amp
CRUNCH CS5768CX 5x7 speaker for dash
jensen octane XDA92RB amp
rockford fosgate 10" sub R2D2
Crunch CS65C component speakers for door
General rules from projectwin:
Sound deadening is of utmost importance
get the tweeter mounted as high as possible, ear level if you can.
Use digital signal processing and time delay to ensure the cleanest possible sound.
Avoid clipping at all costs, oscilloscope is the easiest way to find amp output waveform clipping.
welp, don't have all those tools so going with the next best thing.
1) Download a frequency/signal generator to your telephone.
signal generator - Android Apps on Google Play
Enjoy millions of the latest Android apps, games, music, movies, TV, books, magazines & more. Anytime, anywhere, across your devices.
2) Ensure all the equalizer stuff is flat and the gain knobs on the amps are all the way down, crossover and filters off
3) pick a channel of speakers to tune and unplug the others, full range are easiest to start with.
4) according to the crutchfield article, use 100,400,800,1000 Hz tones. start low on volume and turn up the receiver until the tone changes, it will be generally obvious. The lowest setting before it changes is where the receiver clips the signal, don't go above that.
4b) for the sub, same thing just use 40 or 60 or 80hz as you see fit and depending on your speaker.
you could stop there and use the same method several times for adjusting gain next, but that is loud and annoying. going to the electron university article and the A/C voltmeter is much quieter.
1) determine your target AC Volt output
Example:
4 ohm speaker (depends on the speaker and how it is wired)x 250 watt target (based on the product manual output RMS for my amp) = 1000 then square root = 31.622 volts A/C target for subwoofer at 50hz 0db test tone
4 ohm x 75 watt target = 300 then sq rt = 17.32 volts <-target for my mids (and 100hz tone)
100w is 20vac
200w is 28.28vac
2) Disconnect the speaker wires at the amp or the speaker, whichever end is easier to get to
3) play your test tone and set the receiver at your max level without signal clipping.
4) put the leads on the speaker wires, and adjust gain until your target number is met.
To set the crossover
1) once you've reached your gain, adjust your frequency tone to your desired crossover tone. 80hz is apparently common, so that's what I went with.
2) adjust the crossover knob until you reach 1/2 of your output number, 8.7 VAC in this case.
and repeat for all your channels. Turn it on and adjust equalizer generally through reductions if you feel the need, but this should keep you in the safe and easy way to get everything moving. Much lower risk than just tossing it in there and making a guess
