FAO "all" mig users that know stereo set-ups please........

[Adam]

First i want to start with "WHY DIDNT I KNOW THIS HEADUNIT ONLY HAD TWO PRE-OUTS".....

and the story comences......

I have a VDO CD2200 head unit with two pre-outs, no special sub out and only running 4ohms...(need 2ohms to sort this out really)


this is the closet i could find to math my model number but mine aint silver and robotic looking ....

Ok i have the following set-up waiting to go in when i sort this bugger of problemo out....

TWO 12" Kenwood 3003 subs - 160rms/600peak (each)
sony 6x9's - 180 watt 9already in at moment off headunit)
Kenwood 6" component set - 150watt
kenwood tweeters - rms? (to go by jezus christ handles in back of car)

now this is my concern.....

Running the two Kenwood 12" subs

I thought id get two Alpine MRP T130's -

At £70.00 each from the Free-Ads (cardiff based stereo shop and made big print mistake but they are carrying out with the price quoted in paper)
Channels - 2/1
4ohm Stereo RMS Power - 50Wx2
2ohm Stereo RMS Power - 60Wx2
Bridged 4ohm RMS Power - 130x1


But......then realised no bloody good thats the two pre-outs on me headunit taken up

Another brainwave started......

Alpine MRV - T707
£149.99 + 15.00 (p&p) = £165.00
Channels - 2/1
4ohm Stereo RMS Power - 70Wx2
2ohm Stereo RMS Power - 120Wx2
Bridged 4ohm RMS Power - 240x1

but then was told i can't run bloody "2ohms" on my headunit only 4ohms!!!


then ok i thought......

Alpine MRV-T757
£217.99 + 15.00 (p&p) = £233.00
Channels - 2/1
4ohm Stereo RMS Power - 75Wx2
2ohm Stereo RMS Power - 150Wx2
Bridged 4ohm RMS Power - 300x1

again bloody 2ohms so no good......


Ok i know think what the hell can i get amp wise that will run at 4ohms and give me atleast a minimum of 130 rms per sub (since the subs are 160rms each)......

so i did abit of scouting and hmmmmmm..........



Sound Storm S702 2-Channel Power Amplifier
Sound Storm 2-Channel
Item 6 of 8
Sound Storm S702 2-Channel Power Amplifier
Item # S702
Priced at: $137.95
*
* Power max (2 Ohm): 350W x 2
* Power RMS (4 Ohm): 140W x 2
* MAX power: 700W
* Tri-Mode capable
* High crossover
* Low pass crossover (variable): 35Hz - 155Hz
* Inputs: speaker/line level
* Signal to noise radio: 103dB
* THD @ RMS Watts: 0.01%
* Frequency response 9Hz - 50 kHz (+/-3dB)
* Channel seperation: 90dB
* Damping factor: 125+
* Dimensions: 9-1/2"W x 2-1/4"H x 12"D

thats 140watt rms per sub so only 20 rms wasted.........

and at £98.53 sounds good but what about "are these amps any good syndrome"?
(p&p would be paid via pop since he lives in N.Y. / hence he'd order the bugger and send it to me via airmail......

If i only had 4 pre-outs on me bloody headunit i could of bought two Alpine MRP -T130'S with 130rms at £140.00 all in and have the other two pre-outs for the rest of speakers or even a bloody sub pre-out on me headunit would of been bargain cause then i could of used the 4 pre-outs on me headunit to sort the other speakers out.

any ideas what i should do?

AS four a four channel amp running the speaker set-up i found this too....



Sound Storm S664 4-Channel Power Amplifier
Sound Storm 4-Channel
Item 2 of 5
Sound Storm S664 4-Channel Power Amplifier
Item # S664
Priced at: $139.95

*
* Power max (2 Ohm): 200W x 4
* Power RMS (4 Ohm): 80W x 4
* MAX power: 800W
* Tri-Mode capable
* High crossover
* Low pass crossover (variable): 35Hz - 155Hz
* Inputs: speaker/line level
* Signal to noise radio: 103dB
* THD @ RMS Watts: 0.01%
* Frequency response 9Hz - 50 kHz (+/-3dB)
* Channel seperation: 90dB
* Damping factor: 125+
* Dimensions: 9-1/2"W x 2-1/4"H x 13-3/4"D

*thats 80watt rms per channel and for only £100.00......

[adamSRi]

I didnt read the whole post as its so bloody long, but I think I got the gist of things.

Try and find out if you can bridge the amps, in other words, run 2 things off one amp.

[Adam]

sound quality man!!!!!!!!!!

[Noz]

I'm a bit lost, you're concerned about running 2 ohms because of your head unit? If you're running speakers in a 2 ohm configuration, then its the AMP that takes the 2 ohm load, not the head unit. Pre amp in and out is usually in the region of 1K ohms. If you want to run the subs at 2 ohm, run them in parallel against the biggest single channel output as you can get, you're only using one line out then. Leave the head unit to run the components at 4 ohms.

[Adam]

NOZ....
i was told u cant run the 2ohm way through your headunit even though it says 2ohms on the amp cause it will blow your subs and maybe headunit cause if u headunit only runs 4ohms which all do now adays except pioneer ones....

and i wouldnt want to run any after market speakers off me headunit cause again i was told that its bu bye to your speakers if u do that cause the under power ratio will cock these up...

(well i was told about both of these views by alot by 6 different car stereo places and me mate who hooked up a mad system which i stated a few weeks ago and hes a sparky too.)

[Vauxnova]

adam, i can't see why the rating of the headunit has any effect on the amps

all the Hu does is send the signals to the amp/s
the amp does all the work form thereon
wrongly configured anmps and subs can blow speakers/amps but
blowing HU's i honestly can't see why.

but of you conncet 2 ohms speakers direct to 4 ohm HU then yes it will dammage it but not if it's going thou an amp first

Gaz

[Adam]

assasin.so u reckon i can do the 2ohm set-up for the subs then?
u sure?

[Vauxnova]

yup im sure (i work with home hifi daily) but have a read throu here to make yourself sure
http://www.eatel.net/~amptech/elecdisc/caraudio.htm

Gaz

[Adam]

but will the subs take 2ohms though? hmmmmmmm
i read the page u put up and well im no leccy

[Vauxnova]

That depends on the spec of your subs.


wanna confuse yourself more?
http://www.hobbyelectronics.net/links/audiopro.html

[Adam]

nawwwww i think ill just buy a headunit with 4 pre-outs and a sub out to go with it....

lmao
thanks anyway mate

[Chameleon]

I think I see what you are getting at with this "My headunit won't do 2 Ohms." stuff. This is assuming that you would be running the speakers DIRECTLY from the headunit. I.E. running them from the speaker ouput wires using the headunits internal amp. This is clearly not the case if you are running them through an external amp as the headunit is only using its pre-amp to send a signal to the amp.

You could run the front components from the headunit itself and use the single stereo output to run a 4 ch amp, 2 for the 6x9's and 2 for the subs. Or you could run the signal through a splitter and feed two amps with it.

As for the tweeters for the "jezus christ handles" in the back- DON'T, BAD IDEA!

Of course you could always go for a headunit with more pre-outs which would make it much easier to hook it all up.

Hope this helps...

[Orbital]

Get amps with line outs so you can link however many amp you want together and then you can run everything at 4ohms

[Adam]

Chameleon....As for the tweeters for the "jezus christ handles" in the back- DON'T, BAD IDEA!

why's that mate?

me mates in there cav gsi and renault 21 t done it sozzzzzzz
and its good i though

[Chameleon]

I suppose it depends on what you like. But to be honest, the best sound setup should come from the front. If you sit and close your eyes you should "see" the sound coming from the middle of the windscreen. If you fit tweeters in the rear the high frequencies, being directional, will pull the sound to the back.
You wouldn't turn your back on a concert, would you?
6x9's would be fine as they put out plenty of bass.

I only have front components and a pair of subs in the boot, no rear shelf speakers at all. Sounds quality!

Hope this answers your question.

[lmcaraudio]

OK, Think ive got that all.

there is know problem running the 2 subs from one bridged channel from one amp, this will mean the amp will be running at a 2 ohm load. (Less resistance = more power). It has nothing to do with the headunit.

you have probabley got mixed up, for example you cant run two sets of six by nines of the rear output of a headunit. because that is only designed to run at 4ohm's. The RCA cable just carry the signal to the amplifier.

You will have to run the speakers in parrelell. Visit JL Audio's website they have some good wiring diagrams, you can select the type of speaker eg 4ohm x 2 and it will come up with all the different options and what load (Ohms) they will be feeding back to the amp.

hope that helps. if its not clear just give us a call and i will explain it to you. (Advice is free!!!)

WWW.lmcaraudio.co.uk
01438 213641

[Adam]

Chameleon.............
i was putting the tweeters in back aswell for the purpose of not being ignorent to the slappers and mates i have in me car ....sozzz it seems u are ignorent and want it all up front

lmao

[Chameleon]

Well excuuuuuuuuuse me!
If you have ever listened to an ICE competition or watched the judges you would know the best sound is from the front.

Not ignorance, just an opinion...

[gaz1210]

Ever heard of a sound stage adam?