Question about Alpine MRD-M1000 Car Audio Amplifier

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Bass level does not match volume level!! Please Help!!!

So I have a 10" infinity perfect powered by a fossgate p-500-2 (500wtt) amp and the bass stays at the same loudness regardless of if the sound volume is on 1 or 20. Also the amp does not turn of when the music is off (does when I turn the car off however). Any help would be great! Thanks for your time.
John

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  • johntekin Dec 24, 2007

    so...how do I fix it???

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  • Master
  • 456 Answers

That should be the wiring mistake

Posted on Dec 24, 2007

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My amp turns on good but after a while of too much bass causes a ugly sound too loud what could it be? Can it be repaired?


If you have over driven the amp by playing it real loud with the bass control turned up, it is very possible that you have toasted the output stages of amp.
Every time you boost a tone control by 3 db you have doubled the output power at that frequency. So if you are "coasting" along at a nominal 75 watts, the moment you boost the bass by 3 db the amp has to put out 150 watts at that low frequency.. Go to +6db and now the poor amp has to kick out 300 watts! And so on.

Rule of thumb - you never use your tone controls at very loud levels. Tone controls are there to compensate for the poor frequency response of the human ear at low volume levels - the Fletcher Munsen effect. At low volumes our hearing with the lows and high frequencies so when you play something at low volume you boost up the bass and treble to compensate for poor hearing. At loud volumes our ears respond properly.

Sep 12, 2015 | Car Audio & Video

1 Answer

Bass level is the same @ all volume levels


your problem is the wiring... but it is really hard for me to see where the problem is..

is there a way for you to send a picture of what you have done?

Dec 24, 2007 | Rockford Fosgate Punch P5002 Car Audio...

1 Answer

Can you please tell me the best amp that I can use to hook up a Roland SPD 30, I'm looking for one to get volume. ( loud ).


Hi, With my sound engineers hat on I would use a small PA. mixer, amp and speakers!!!!
For quality you need a full, flat frequency range system with good headroom.
I assume this is for your own listening, when using an acoustic kit?
There are one box solutions.
  1. Drum amps. Like a monitor wedge with an amp, Roland do a PM-10, Various other makes are available.
  2. General purpose powered wedge.
  3. Keyboard Amp, these are full range and available in various sizes.
  4. Bass amp with high frequency driver (tweeter), not the best but will have good bottom end.
  5. Powered or active speaker, much like a powered wedge, but a different shape, needs an input volume control.
All these systems need to have large bass units, 10 inch minimum, and will be in mono. Two will give you stereo,
How loud depends primarily on the sensitivity of the speaker. But manufactures insist on selling things by power. Worth looking this up.
At a couple of feet away, 20 watts should do it, with high sensitivity speakers, more likely you find most things as above start at about 70 Watts.
Good luck, I hope I have widened you choices a bit.
All the best, Chris the Fader.

Oct 03, 2014 | Roland Spd-30 Drum Pads

1 Answer

What would cause my fossgate t1500 to shut off everytime the bass hits hard I have two t12s that it pushes


Sounds like your amp isnt powerful enough to power your subs, whats the wattage of your amp and both subs? Its shutting off when hard bass hits to protect itself from blowing, a good feature as a blown amp means a new one. an amp should always be more powerful than the speakers / subs you are connecting to it. for 2 500w subs your looking at a 1200w amp minimum.

Feb 22, 2011 | Car Audio & Video

1 Answer

I have a Kenwood KAC-9105D amp with 2 Rockford fosgate 10 inch subs in a sealed box. When i turn the volume up loud the bass fades out for a few secs and then comes back to being loud again, this keeps...


It's the battery, not enough juice to supply your amp at loud volumes so the bass will drop out especially on long bass notes. Replace your battery!

Sep 25, 2010 | Kenwood KAC9105D Car Amp

1 Answer

Technics su z2 amp shuts off sound


hello. we cant help if we dont know what music source you are using.

Apr 13, 2009 | Technics SA-AX530 Receiver

1 Answer

Perfect ten bass amp, guitar


can you use headphones? if so do they sound normal. probably have bad filter caps. 2200uf caps big ones, go bad and lose their capacitance and cant process the low end notes, sounds like a motorboat or ******* out. speaker may have issues as well. get the caps from mouser.com and careful of stored voltage on the capacitors it is deadly....... those caps are less than 2 bucks each.

Jan 21, 2009 | Ashdown Perfect 10 Bass Combo Amp Car...

1 Answer

Amp Issues


1) Make sure a bridged load of no less than 4 ohms is applied.
2) make sure both the left & right channels are working.

Jan 29, 2008 | Rockford Fosgate Punch P2002 Car Audio...

1 Answer

Loud distortion on Front Channels


Well, the nice thing about the newer amps is that the actual amp circuitry is all contained in a module and you don't have to do much troubleshooting. Just replace the module for that pair of channels. Bad news of course is the modules can be pricey. Should say right on it the part number, order it from mcminone.com or whoever, solder it in, use new conductive grease (many times I think these modules fail because the grease gets old, the module overheats and toasts) and you should be fixya'd

Jan 12, 2008 | Marantz SR-5200 Receiver

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