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Can You Figure This Out ? Alpine MRV-F545

Old 04-16-2008, 06:47 PM
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Can You Figure This Out ? Alpine MRV-F545

The amp is Alpine MRV-F545
its a pretty Rare amp not too many people have it
mostly because its so confusing

Anyways here is my problem it seems to be louder when the gain is low (louder when its .2v ) and louder when the Hz are toped off to 400hz
this isnt right is it ?

I have the amp bridged for my subwoofer doing 500-600rms at 4ohm's like it supose to

Now i was playing with the setting and it has the following
InputGain .2V to 4V
Freq at LP 30Hz to 400hz
which are digital

the Amp powers the subwoofer amazingly when i have the settings set at .5V and 300hz ( THIS IS THE PROBLEM )

the higher the gain (v's) the less sound there is and i mean at 2-4Volts theres almost no bass

and i know i should set the Hz to 80 but same deal the bass is very quiet and hits better and louder at 300+hz

I was riding for a few hours on .5V gain and 400Hz which is the loudest settings and the bass was VERY clear and i was so impressed but after 2 hours the amp got SO hot that u cant touch it without your finger burning.

SO why is is louder when input gain is low in Volts and high in Hz ?

Could this because of my deck ? its a crappy jensen 2V preouts

and i tried everything amp is set on LP. bridged chan's everything is correct
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Old 04-17-2008, 07:05 AM
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your gain is maxed out, and you're playing midbass and midrange through your subs...that's why it's louder. Gain works the opposite to what you think. In other words, the higher the input voltage, ie. 4 volt decks, the lower gain is required to get the same output as say a 2 volt deck. Your's is set at .2 volts, which means the amp thinks the deck is only delivering .2 volts pre-amp level, and therefore must increase it's gain, to maximum in this case, in order to give full output. What you need to realize is that you're only getting louder at a lower volume setting on your deck, the same output would be achieved if you had your gain set properly, but at a higher volume setting on your deck. Try setting your gain to 2volts, and crossing over at 120 hz for now. turn your volume up to about 80-90% of max and then let us know if the bass and loudness are still lacking. To further understand "gain"...go to this site, scroll down to number 23 on the right side of the page,"Amplifiers", and read it, there's a section on gain you can click on...once you understand that, you'll be good to go.

Basic Car Audio Electronics

Last edited by veeman; 04-17-2008 at 07:07 AM.
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