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Old 06-30-2008, 03:15 PM   #1
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How to adjust AMP

Ok guys i am more than half way done installing my Amp Alpine MRFP250
once i am done how do i correctly adjust this amp IE: Gain Control and stuff so that it does not sound like crap

Thanks
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Old 06-30-2008, 03:54 PM   #2
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1. set the cross over to around 100 hz low pass.
2. turn gains on the amp all the way down (low sound output)
3. turn the head unit volume up to around 80-90% of maximum, or to the point where the other speakers are just below distorting using a pop or hip hop type cd recorded at high levels (they tend to be recorded very high)
4. turn the gains on the amp until the sub starts to distort, then back off until it stops and is clear sounding.
5. enjoy

that's the basics, as gain settings can be adjusted more accurately with electronic equipment (which I, you, or most enthusiasts probably don't have).

also, the cross over settings can be played with until you like the sound you're getting. it's all part of tuning.
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Old 06-30-2008, 09:20 PM   #3
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Gain Tutorial

--HERE-- is a non-technical, easy to understand tutorial about setting your amplifier gain controls.
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Old 07-18-2008, 01:31 PM   #4
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Amp finally working

Well guys i finally got the amp installed and working i would also like to thank Chris of perfect tones in milton for adjusting the amp for me

Quick question may be veeman can answer for me you mentioned in a previous post on how to adjust the amp that the cross over settings could be played with abit what does the crossover setting actually do for the sound or the amp

Thank you for all suggestions you guys offered when doing this
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Old 07-18-2008, 01:49 PM   #5
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Originally Posted by MONTANAMAN View Post
Well guys i finally got the amp installed and working i would also like to thank Chris of perfect tones in milton for adjusting the amp for me

Quick question may be veeman can answer for me you mentioned in a previous post on how to adjust the amp that the cross over settings could be played with abit what does the crossover setting actually do for the sound or the amp

Thank you for all suggestions you guys offered when doing this
Chris is the .

Crossover cuts of frequencies. if you set your LPF at 100 hz, it will cut off (by cut off i mean will not reproduce) anything above 100hz.

different types of speakers are ment to reproduce different frequencies, hence why crossovers are used.

For example, bigger subwoofers are generally ment to reproduce the low end frequencies, 25 to 100 hz. Then you have mid bass speakers in forms of smaller subwoofers which can reproduce anything from 125 to 250. And so on, the smaller the speaker the higher the frequency it will reproduce best. Tweeters are tiny and they play in the range of 5k+ hz. This is very general but that's how it goes.

So to answer your question, the crossover doesnt really do anything for the amp itself. It is there to help you reproduce the proper frequencies thru your speakers.

If your amp has a LOW PASS FILTER, it will cut off all frequencies ABOVE whatever you set it at.

If your amp has a HIGH PASS FILTER, it will cut off all frequencies BELOW whatever you set it at.

If you are using a 2 or 4 channel amp it should have both of those.

A single channel amp (mono block) normally would not have a high pass filter. It would have a subsonic filter instead.
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Old 07-18-2008, 02:27 PM   #6
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The amp i am running is a http://http://www.alpine-usa.com/US-...model=MRP-F250

the cross overs are set to 75 the speakers hooked to the amp are

http://http://www.pioneerelectronics...S-G1642R?tab=B

Do you think it is set up ok or should i turn the cross over up or down
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Old 07-18-2008, 02:36 PM   #7
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Crossovers depend on cutoff slopes as well. Typical slopes are 6db, 12db, 18db, and 24db. So if your amp has a lowpass filter for your sub with a 12db/octave cutoff slope and it's set to 100Hz then your sub will actually play 200Hz frequencies but they will be lowered by 12db in volume. This can be used to your advantage to blend your sub and midbass speakers.
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Old 07-18-2008, 02:54 PM   #8
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it says those speakers can reproduce 40 Hz to 30 kHz

so im gonna say your crossover is set OK just be sure you put the crossover switch to HPF. you can maybe set the crossover even lower, maybe 50hz.

makesure you are not boosting too much bass to these speakers. just enough to make it sound nice without distortion.
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Old 07-18-2008, 05:43 PM   #9
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I find this thread helpful, especially the link to the gains adjustment for multi amps. I have a question though,

on my deck I have options for slopes, Front HPF, Rear HPF, Front + Rear Levels, Sub Level and Sub Slopes. My amplifiers also have these exact same options. Now when configuring this type of system, which filters take control? Will the settings on the deck take place, or the settings on the amplifiers? IS their anyway to make it so settings on the deck are the ones in charge allowing for easy adjustment any time?
 
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Old 07-18-2008, 11:41 PM   #10
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^^yeah, turn the amp's cross over to all pass, off, or no cross over (whatever they call it on your amp). This will disable the amp's cross over and only your deck will do the crossing. You don't want to use both as it will screw up the slope rates, and you really won't know what you're getting.
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Old 07-18-2008, 11:41 PM
 
 
 
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