subs

Fluffy Bunny · 25 Jan 2007 at 20:42

just installing some subs (2x1000watts jbls) on a american legacy 2000watt amp.The head unit is a jvc 502 .
Should sound ok yes.........nope.....subs are distorting if you now what I mean.sounds like I got the stereo on full. The fact is it is not even on half.
Dont know how to set the amp up or to bridge the subs.......
Any help would be really welcome.

Thanks

agw_01 · 25 Jan 2007 at 20:43

What have you got the gains on the amp set to?

Fluffy Bunny · 25 Jan 2007 at 20:49

in the middle ??????????

Six6siX · 25 Jan 2007 at 20:54

Are they new subs?

Fluffy Bunny · 25 Jan 2007 at 21:00

no sorry but they look in mint condition....
they look new to be honest.

Jonny ///M · 25 Jan 2007 at 21:03

Fluffy Bunny said:
no sorry but they look in mint condition....
they look new to be honest.

Do they stink of burning at the back

gurusan · 25 Jan 2007 at 21:17

Legacy is junk.

Also your crossover settings might not be set properly.

xcessive · 25 Jan 2007 at 21:20

Fluffy Bunny said:
just installing some subs (2x1000watts jbls) on a american legacy 2000watt amp.The head unit is a jvc 502 .
Should sound ok yes.........nope.....subs are distorting if you now what I mean.sounds like I got the stereo on full. The fact is it is not even on half.
Dont know how to set the amp up or to bridge the subs.......
Any help would be really welcome.

Thanks

It sounds as if you havent set up the gain level on the amp properly.

You need to make sure your subs are running through the LPF (low pass filter) on the amp. I'm guessing your amp is 4 channel so i would advise you to use 2 channels per sub.
Once you've done that you can set up the gain levels:

1. turn gain level to minimum on amp and any other 'bass boost' settings on headunit off.
2. set the volume on the headunit to roughly 75% of the maximum volume it can go to
3. slowly increase the gain level up on amp until you can hear the subs distorting
4. turn the gain down by about a 1mm so it doesnt distort if you are playing music at higher than 75%
5. tweak high and mids on headunit till you have good, balanced sound system

xcessive · 25 Jan 2007 at 21:22

gurusan said:
your crossover settings might not be set properly.

How would you set up crossovers properly ?

Reality Bites · 25 Jan 2007 at 21:59

http://www.talkaudio.co.uk/vbb/showthread.php?t=158955

nawty on talk audio knows what he's talking about. I used his advice to set my comps and sub up....sounded carp before, and sweet now!

Fluffy Bunny · 27 Jan 2007 at 23:27

Just a few more questions though.
I want to set the amp up right so can someone explain what these are on the amp.
1. crossovermode with options for
Full
Lp
Hp
2.Bass Boost
3.Low Pass
4.High Pass
5.Level
can anyone help me out with what the above do,and the right way to set thenm up.

Thanks

xcessive · 27 Jan 2007 at 23:32

For a sub you will want to select LPF (low pass filter).
Level will be the gain level on the amp so you'll need to set up the gain as i mentioned above.

Set the bass boost off on the amp. It will make the sub sound crap if you switch it on.

Reality Bites · 27 Jan 2007 at 23:34

Fluffy Bunny said:
Just a few more questions though.
I want to set the amp up right so can someone explain what these are on the amp.
1. crossovermode with options for
Full
Lp
Hp
2.Bass Boost
3.Low Pass
4.High Pass
5.Level
can anyone help me out with what the above do,and the right way to set thenm up.

Thanks

did you even look at talkaudio?

Fluffy Bunny · 27 Jan 2007 at 23:40

yes thanks some good things on there, but as a complete noob at this (audio) found it daunting....so if I upset you........sorry.

Thanks for the advice

Reality Bites · 27 Jan 2007 at 23:45

dont be datf! lol

just that you would find more audio advice on there that here.

no offence to the audio experts here (as there is a few) but there are way more on that site.

i will say though, they are quite slow to reply sometimes on that site.

I'm sure with a bit of searching and some posts you'll find all you need.