Eq = better spl ?!?!?!?

[rx7vert 10+ year member]

ok, I put this here because it involves lots of different elements of the system, and couldn't put it in onw of the more specific pages.

The thing is, I have been running a little cheap *** eq on my subs for a while. it has one rca input, and 2 outputs. I crossed the signal over low for the subs, and put the high signals to the bottom.

I have 2 amps for my subs, both are 350w alpine mono class d's

I ran the outputs on the eq to the amps, and the eq had 3 other wires, ground, power, and remote. even without the ground and power wires hooked up it would run off of the rca's how, I don't know. but I hooked the power and ground up, and have all of my system remote wires hooked through a switch instead of to the cd player (easier to work on)

anyways, my eq decided that it had put out its 30 dollars worth, and died.

so I just bought some splitter for the rca's coming from the cd player, and ran it to the amps, so they are both getting one right and one left signal.

the subs do not hit anywhere near as hard as they did with the eq. they are getting the exact same signal, and I didn't mess with anything else at all.

I know splitting rca's doesn't cut the signal in half, but it almost seems like thats what happened. both amps are recieving matching signals, so cancellation from sub to sub isn't a worry,

The one thing that I did notice is that the amps arent putting out the same ammount of power, they don't push the subs as hard as before (when the eq was there)

I tried turning the sub level control on my head unit up, but it didn't help much.

anyone have any clue at all as to whats going on??

Click to read more...

 

[rx7vert 10+ year member]

oh,

head unit is Alpine 9805 about a year old

rca's are all monster cable, one 18ft running from h/u to trunk, and then 2 36" ones (one per amp)

the amps are Alpine mp350's 350w rms at 2 ohms. mono, class d

subs are type r dual 4 ohm.

subs are in seperate ported boxes.

they have always souded **** good, till I took the eq out.

its really starting to piss me off.

 

[DBfan187 5,000+ posts]

Was the EQ also a line driver?(did it boost the output voltage?) If so, your gains could be off!(unmatched)

 

[rx7vert 10+ year member]

It might have been. I was a freebie from a friend. I was a pyramid 749 somethin or other.

I think I'm just gonna get another one. Or see if I can get in on the 2 year warranty somehow.

 

[`pr0digy 10+ year member]

It might have been. I was a freebie from a friend. I was a pyramid 749 somethin or other.
I think I'm just gonna get another one. Or see if I can get in on the 2 year warranty somehow.

Couldn't you just reset your gains ?

 

[DBfan187 5,000+ posts]

Couldn't you just reset your gains ?

Yes, yes he can and should!

 

[rx7vert 10+ year member]

y'all are all going to disown me and hate me forever for being this incredibly stupid.

what do you mean by reset gains? just turn them all the way down and then back up or something

please explain...... in terms a dumb *** can understand..... lol....

 

[DBfan187 5,000+ posts]

Yes, match the output voltage from your HU to your amp using a DMM, though an Oscope would be best. Please refer to the tutorial in the Amp section for more info.

 

[rx7vert 10+ year member]

wow.... greek.... almost..... going to tutorial now.

i need stereo for dummies.....

 

[rx7vert 10+ year member]

oh ok, I get it. I'll do that this weekend or something. i dunno when i'm gonna have time, but we'll see.

let me get this straight though

my amps are 350rms, but really put out like 378. should I just go with the 350 since thats what alpine rates them at? at least that way i wouldn't be borderline clipping.

so it would be square root of (350 x 2)

square root of 700 = ????? whatever that is is what the amp needs to be putting out in volts?