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Amp Adjustment 

 

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 Post subject: Amp Adjustment
Posted: Fri Apr 29, 2005 12:36 am 
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any one an expert in this field? i cant seem to get my sub sounding right.
dont know if its better to face the sub towards the boot or rear seats.

its a 12" Allpine type S sub Dual voice coil. with a V12 2 channel amp in a 1.1 cubic foot MDF box

any tips or advice please.

 

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Posted: Fri Apr 29, 2005 1:04 am 
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its a matter of trial and error with the placement, i found facing the boot on the the spare wheel the best in my car. Its a JL 10" and i have the x-over cut off point at 180Hz.
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Posted: Fri Apr 29, 2005 2:56 am 
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12" sub, dont' LPF it any higher than about 120hz

get cabin speakers sounding right without any loudness boost from the h/u
then plug in the sub and tune it to suit the rest of the system, once again no loudness boost.

try to avoid any boosts as such as it introduces clipping. that being said, using bass EQ adjustment on ur h/u is ok cos they're fairly incremental as long as u don't go overboard!

adjust the gains carefully on the amp as well.

this is how i tune my system, and it sounds right to me. I have a little bass boost for subs, and a bit of midrange and treble boost for that little extra up top. fortunately my h/u has a 13band eq on it :)

experiement and see how you go :)

 

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Posted: Fri Apr 29, 2005 10:03 am 
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I have a wierd one. It's one of those prefab ported boxes, with the port to the side. It sounds best at the back of the boot, facing forwards, therefore the port is only 10/15cm away from the passenger side of the boot. From everything that people say, its a much better result than expected.

When I had my sealed box, it was best (and most space saving) up against the back of the seat (wedge shaped) facing backwards.
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Posted: Sat Apr 30, 2005 12:04 am 
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aphexer wrote:
12" sub, dont' LPF it any higher than about 120hz

s**t...... my 10" pioneer sounds f**k if it goes over 80hz.......

 

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Posted: Sat Apr 30, 2005 3:16 pm 
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best i can get it is with the LPF at around 70Hz and the DB+ and Gain Just over 3/4.

when i get my new head unit next saturday i might have a bit more of a play aroud with it.

 

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Posted: Sat Apr 30, 2005 4:03 pm 
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aphexer wrote:
12" sub, dont' LPF it any higher than about 120hz


Why shouldn't you put the lpf higher than 120hz. I got mine set to 160hz so i can crank up the speakers more withour distortion. I thought running like 500hz through it damages it. I thought 160hz wouldn't. but thats just me, will it damge it.
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Posted: Sat Apr 30, 2005 10:11 pm 
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subs are meant for the lower frequencies, and dont reproduce frequencies above 75hz or so (depending on sub) too well

 

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Posted: Sat Apr 30, 2005 11:56 pm 
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The DMac wrote:
aphexer wrote:
12" sub, dont' LPF it any higher than about 120hz


Why shouldn't you put the lpf higher than 120hz. I got mine set to 160hz so i can crank up the speakers more withour distortion. I thought running like 500hz through it damages it. I thought 160hz wouldn't. but thats just me, will it damge it.


LPF (Low Pass Filter) not HPF (High Pass Filter) bloke ;)

 

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Posted: Sun May 01, 2005 12:28 am 
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Hmm just a question but how does taking the loudness off of the rear speakers make it sound better, wouldnt this decrease the midrange? :? Also with my setup i have the sub gain on 1/2 way with the sub only producing bass and no treble. (cant remember what thats called again) :roll:

Sounds alrite i mean i lack midbase in the system ne way, as fronts need to be upgraded.

But yeah i have the same Alpine sub and i have faced mine towards the back of the car. other than the lack of midbase in my system it sounds pretty darn good.

 

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Posted: Sun May 01, 2005 1:42 am 
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hmmmm
ive always tuned my subs at 50Hz LPF !

(and they are good subs, rockford HE2s!!)

 

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Posted: Sun May 01, 2005 2:29 am 
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I was told that 6" speakers aren't really supposed to be used to play frequencies much lower than about 120hz, maybe down to about 80hz if they're properly amplified. Running off a headunit is hardly supplying the power 6" speakers can take, so setting the filter to about 120hz in my eyes is a good idea (this is how i run my setup)

As for loudness, from what i can hear, all loudness does is boost bass and treble - it leaves the midrange alone. After all, if you take your average speaker and run it with a flat frequency curve from the headunit, you will find that the frequency response starts to roll off at ~16-20khz and ~100-140hz. Loud attempts to counter this by boosting the headunits output at those frequencies and beyond. Once you start adding amps and decent speakers you will find that loud doesn't really serve much of a purpose as you can adjust the amp/s and headunit outputs manually for the sound output you enjoy the most.

That's my theory anyway

 

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Posted: Sun May 01, 2005 11:50 am 
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aphexer wrote:
The DMac wrote:
aphexer wrote:
12" sub, dont' LPF it any higher than about 120hz


Why shouldn't you put the lpf higher than 120hz. I got mine set to 160hz so i can crank up the speakers more withour distortion. I thought running like 500hz through it damages it. I thought 160hz wouldn't. but thats just me, will it damge it.


LPF (Low Pass Filter) not HPF (High Pass Filter) bloke ;)


I know, i was saying i have it that high so i can put the speakers up louder.
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Posted: Sun May 01, 2005 12:25 pm 
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haggis wrote:
I was told that 6" speakers aren't really supposed to be used to play frequencies much lower than about 120hz, maybe down to about 80hz if they're properly amplified. Running off a headunit is hardly supplying the power 6" speakers can take, so setting the filter to about 120hz in my eyes is a good idea (this is how i run my setup)

As for loudness, from what i can hear, all loudness does is boost bass and treble - it leaves the midrange alone. After all, if you take your average speaker and run it with a flat frequency curve from the headunit, you will find that the frequency response starts to roll off at ~16-20khz and ~100-140hz. Loud attempts to counter this by boosting the headunits output at those frequencies and beyond. Once you start adding amps and decent speakers you will find that loud doesn't really serve much of a purpose as you can adjust the amp/s and headunit outputs manually for the sound output you enjoy the most.

That's my theory anyway


Yeah fair enuf i can see how that would be a fair assumption, hmm my problem is i just need a decent 5 channel amp i think. That way i can use it to boost my whole system, rather than just relying on my sub.. :roll:

 

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