too many eq’s
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=76539
Printed Date: May 16, 2025 at 6:30 PM
Topic: too many eq’s
Posted By: jayson358
Subject: too many eq’s
Date Posted: April 20, 2006 at 9:08 PM
ok guys here's good one i assume for all u vets i need all the help i can get so please give me any advice u have on this
i have a 93 diamante
hu- pioneer deh-p3800mp
has 2 2.2v preouts front and rear/ or sub out
eq(1)- lanzar vibe e750s 7 band preamp eq
has 1 input and front, rear, sub preouts
dont know what volt out is on outputs
eq(2)- crossfire cfq20x 40 band (20left&20right) eq with 5 volt line driver
has 1 input and 1 highpass out and 1 lowpass out
amp1- alphasonik pma4075 class a/b 4ch amp 75Wx4 rms @ 40hms 2 inputs front and rear and 1 output
amp2- clif designs cd10.1Lx class a/b mono block amp
350Wx1 rms @ 4 ohms there are 2 sets of speaker output terminals on this amp but its a monoblock internally bridged amp (i have had this amp @ 1 ohm for 2 hrs straight and it stays warm not hot at all its a hellava amp) anys 1 input and 1 output
1st how should i run the rca's to everything cause of the eq's only have 1 input its stressin me cause im never satisfied with the tuning of the eq's i know it could sound way better but im jus lost right now
2nd how would ya'll rate the crossfire, alphasonik, and the clif stuff r they good or what
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93 diamante
pioneer deh-p3800mp
crossfire 40 band eq
alphasonik pma4075 mid amp
clif designs cd10.1Lx sub amp
powerbass xtreme 6 1/2 comp
" " 6x9 rear
alpine 2 12" type r
ported 40hz tune
Replies:
Posted By: stevdart
Date Posted: April 21, 2006 at 12:24 AM
Per your other post, yes I have a response here: why did you buy all this stuff? And since you already have this stuff, why ask for opinions on them? Draw up an installation diagram on paper. That's the only way I can do it. ------------- Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
Posted By: forbidden
Date Posted: April 21, 2006 at 12:55 AM
Opinion #1 - You have too much stuff that is degrading the signal and is giving noise a chance to breed out of control. Solution#1 - Sell all the eq's and the cd player. Reality - you do not use an eq unless you need it to do a identifed task. To me it seems as though you are using the eq's as a bandaid instead of a dedicated and identified problem solver. In a case like this, I would take a good cd player like a <insert brand name here (shameless plug for Eclipse  )> bypass all of the eq's and let it fly. Not once has this test ever let me down. What can be accomplished with one item, you are hoping, wondering and trying to do with 3. ------------- Top Secret, I can tell you but then my wife will kill me.
Posted By: jayson358
Date Posted: April 21, 2006 at 10:00 AM
1st i bought the 7 band cause its nice to have an eq 2nd i bought the crossfire later down the road cause i couldnt beat the price and secound it has a line driver in it 3rd the crossfire is the last inline before the amps to make sure the full 5 volts is getting to them the pioneer i cant afford a nice cd player like an eclipsebelieve if i could i would 4th i thought eq's are better for tuning for sql than bass and trebles on hu 5th i jus want a really good sound system quality with what i got so please some1 help ------------- 93 diamante
pioneer deh-p3800mp
crossfire 40 band eq
alphasonik pma4075 mid amp
clif designs cd10.1Lx sub amp
powerbass xtreme 6 1/2 comp
" " 6x9 rear
alpine 2 12" type r
ported 40hz tune
Posted By: jayson358
Date Posted: April 21, 2006 at 10:03 AM
oh yea forgot i dont have any noise at all in the sound no hiss,whine,no nothing so whats wrong with having them all even when my signal is not being degraded when the crossfire is 3feet before the amps when it putting 5 volts to them thanx again guys for any infoe
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93 diamante
pioneer deh-p3800mp
crossfire 40 band eq
alphasonik pma4075 mid amp
clif designs cd10.1Lx sub amp
powerbass xtreme 6 1/2 comp
" " 6x9 rear
alpine 2 12" type r
ported 40hz tune
Posted By: Ravendarat
Date Posted: April 21, 2006 at 10:05 AM
OK, there is no such thing as SQL to start with. Second, what you are gonna do if you wanna use all this, your gonna run the deck preouts into the 7 band indash, then you are gonna run the FRONT outputs into the crossfire and then out from the crossover to the front amp. You are gonna run the rear and the sub preouts strait from the 7 band to the amps in the back. Those ones arent going to go through the crossfire. This is IMO probally the best way to run this.
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double-secret reverse-osmosis speaker-cone-induced high-level interference distortion, Its a killer
Posted By: jayson358
Date Posted: April 21, 2006 at 10:19 AM
hu- pioneer deh-p3800mp
has 2 2.2v preouts front and rear/ or sub out
eq(1)- lanzar vibe e750s 7 band preamp eq
has 1 input and front, rear, sub preouts
dont know what volt out is on outputs
eq(2)- crossfire cfq20x 40 band (20left&20right) eq with 5 volt line driver
has 1 input and 1 highpass out and 1 lowpass out
amp1- alphasonik pma4075 class a/b 4ch amp 75Wx4 rms @ 40hms 2 inputs front and rear and 1 output
amp2- clif designs cd10.1Lx class a/b mono block amp
350Wx1 rms @ 4 ohms there are 2 sets of speaker output terminals on this amp but its a monoblock internally bridged amp (i have had this amp @ 1 ohm for 2 hrs straight and it stays warm not hot at all its a hellava amp) anys 1 input and 1 output
the crossfire and the lanzar only have 1 input so thiers no pass through on them
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93 diamante
pioneer deh-p3800mp
crossfire 40 band eq
alphasonik pma4075 mid amp
clif designs cd10.1Lx sub amp
powerbass xtreme 6 1/2 comp
" " 6x9 rear
alpine 2 12" type r
ported 40hz tune
Posted By: DYohn
Date Posted: April 21, 2006 at 11:09 AM
If I were you I'd get rid of all that crap and start over. At the very least dump those EQ's, run the two pre-outs from your HU to the 4-channel amp and daisy chain the sub amp off it's output. If you really want to use the gear because you have it then Ravendarat's setup is a good way to go. But seriously, your subject header "too many EQs" pretty much says it all. Dump 'em on FleaBay and use the money to upgrade your head unit. ------------- Support the12volt.com
Posted By: jayson358
Date Posted: April 21, 2006 at 11:55 AM
what about the volt output isnt better to have a higher volt preout put thats my main thing too
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93 diamante
pioneer deh-p3800mp
crossfire 40 band eq
alphasonik pma4075 mid amp
clif designs cd10.1Lx sub amp
powerbass xtreme 6 1/2 comp
" " 6x9 rear
alpine 2 12" type r
ported 40hz tune
Posted By: jayson358
Date Posted: April 21, 2006 at 12:02 PM
oh yea cause i read somewhere on this site someone posted a higher s/n ratio is better so a higher volt preout equals a higher s/n ratio in the system and the amps efficiency will be greatly improved then u have more wattage out of the amps "50% power is lost in heat" am i right cause most of yall say this in ur post
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93 diamante
pioneer deh-p3800mp
crossfire 40 band eq
alphasonik pma4075 mid amp
clif designs cd10.1Lx sub amp
powerbass xtreme 6 1/2 comp
" " 6x9 rear
alpine 2 12" type r
ported 40hz tune
Posted By: Steven Kephart
Date Posted: April 21, 2006 at 1:28 PM
A higher pre-out voltage will reduce the chance that noise could come into the system. However if installed properly it isn't needed. I have very expensive equipment in my car and I measured with an O-scope that its output voltage is less than a Volt. And I have absolutely no noise issues whatsoever. For more information on this, please read this link: https://www.bcae1.com/preoutv.htm As for efficiency, in actuality between 97% to 99.5% of power is lost as heat in a speaker. This is because speakers are generally about 1% efficient in changing electrical energy into acoustic energy. And finally, to find out all about S/N ratio, please read this link: https://www.bcae1.com/sig2nois.htm
Posted By: haemphyst
Date Posted: April 21, 2006 at 4:40 PM
What Steven said above, AND:
jayson358 wrote:
oh yea cause i read somewhere on this site someone posted a higher s/n ratio is better so a higher volt preout equals a higher s/n ratio in the system
ABSOLUTELY false. Yes, a higher SNR is better, BUT the SNR is FIXED, and is determined by the topology of the amplifiers and signal components in the chain. The knob on the end of an amplifier is NOT a gain control, it is a signal matching device. The gain of an amplifer is also fixed; this knob simply matches THAT signal level to the (topologically fixed) GAIN of the amplifier. If you have a level matching range of .2v to 8v, and you have a deck with 8V outputs, all the "gain control" does is minimize the input signal to keep the input signal from overdriving the final gain stage. In the case of THIS example amplifier, the gain stage is SET PERMANENTLY to be driven to full output by (somewhere close to) a .2v input. If your system is "gain" matched correctly, your SNR will be at the best it can be, no matter WHERE the "gain" (the knob on the end of your amp) is set.
jayson358 wrote:
and the amps efficiency will be greatly improved then u have more wattage out of the amps "50% power is lost in heat" am i right cause most of yall say this in ur post
True, but I think you are misinterpreting what we are saying. An amplifier that is 50% efficient, producing 100 watts AT the speaker terminals, will also be producing 100 watts in heat. This means that to PRODUCE 100 watts of output, it will demand 200 watts of input. This will hold true no matter WHAT the output power is. 50 watts out will demand 100 watts in... MOST class A/B amplifiers are actually around 60% efficient, so the heat portion will be a bit lower than the output portion, but you get the idea. ------------- It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."
Posted By: jayson358
Date Posted: April 21, 2006 at 5:38 PM
i really appreciate all the input ya'll have helped me with but one last thing what is wrong with using the eq's ive been thinking today i have the matching crossfire xover that goes with the eq it has 2 input (1 highpass & 1 low pass) and 3 out puts f,r, and sub is that ok to do that set up i mean really good system installs ive heard had multiple large eq's why did they use'm im mean it must help a little for sound quality right
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93 diamante
pioneer deh-p3800mp
crossfire 40 band eq
alphasonik pma4075 mid amp
clif designs cd10.1Lx sub amp
powerbass xtreme 6 1/2 comp
" " 6x9 rear
alpine 2 12" type r
ported 40hz tune
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