Audio setup advice

[Fat Audi 80]

Well done so much for diplomacy...

I'm only messing with you.

[Henkjan]

yep, 4" on the ori place and then filter them at anywhere between 100 and 150Hz and you should be fine also at higher volumes. imho much better than having a 6" low in the door and only the tweet on top, this pulls down the soundstage too much.

[Rusty]

I'm only messing with you.

I know Fatty. I was in a bit of a piss so decided to bite a little

[Sonic]

So ive got my amps, Cheers Andy

This is my initial idea - using stock mounts and a sealed bass enclosure.

[Fat Audi 80]

Did you draw that?

You have waaay too much time on your hands.

I think that setup is great. Be careful you don't get too much bass with twin JL Subs! (Seriously)

Also, can you variably adjust the gain on each pair of channels on your four channel amp? (I would expect you can) as you will need to "turn down" the rear speakers to avoid the soundstage travelling to the rear.

As already advised, I would high pass filter the front speakers at 120 - 150 hz and also consider hp filtering the rears at 80 - 100hz to allow you to drive them really hard. The subs will easily fill in the rest

Now talk me through your ideas for the twin sub box and amp rack???

Cheers,

Steve.

[Fat Audi 80]

I know Fatty. I was in a bit of a piss so decided to bite a little

Git!

You know I am a sensitive soul.

[borderS2]

series/parallel bass

Which wiring are you using?
parallel = 2ohm/2 = 1ohm =
Series = 2ohm x 2 = 4ohm = amp power halved

they did a 4ohm version D4 which you could run in parallel.
Both of these speakers are discontinued.

Those drivers appear to be rated at 300w continuous (is that RMS?)
Manual

http://mobile.jlaudio.com/pdfs/10W3v2_MAN.pdf

48 litres per speaker is a big box
2x 20cm x 24cm x 1m
Smaller boxes may colour the sound, making it "honky"
Tuned vented box will be roughly half that but the lowest frequencies will be comprimised.
Dane

[Sonic]

Did you draw that?

You have waaay too much time on your hands.

I think that setup is great. Be careful you don't get too much bass with twin JL Subs! (Seriously)

Also, can you variably adjust the gain on each pair of channels on your four channel amp? (I would expect you can) as you will need to "turn down" the rear speakers to avoid the soundstage travelling to the rear.

As already advised, I would high pass filter the front speakers at 120 - 150 hz and also consider hp filtering the rears at 80 - 100hz to allow you to drive them really hard. The subs will easily fill in the rest

Now talk me through your ideas for the twin sub box and amp rack???

Cheers,

Steve.

I figured Visio which i normally use for network infrastructure and UML could be used for electronics with my basic knowledge

My logic for the twin sub's is that i have a sub enclosure capable of fitting 2x 10" sealed, and that twin 10" in a sealed container would provide way tighter bass than a single 10" ported or a single 10" sealed with a higher power rating. Im not necessarily after massive bass, but sharp response, and the amp can take it

I can set HPF on the amp, and like you say, 120 at the front and 80 at the rear will be nice. My only thoughts are that i could fit speakers with a higher power rating to compensate for the bass and stop it completely overtaking the front's.. or maybe i shouldnt look at twin subs

Ive got a basic build (courtesy of Andy C again) which consists of an MDF floor to house the twin amps, very similar to yours steve, and an MDF ported sub box which sits between the floor and rear seats nicely, but is designed to be wedged in by the spare wheel which i dont have.

Im thinking i'll keep the floor, and use the sub box as a mould to make a new one that fits the entire width of the boot, keeping the same principle of floor with bass between it and the seats.

This takes up a lot more room for sure, but i dont plan on using my boot often having retired the s2 as a weekend and leisure car.

Im also planning on making it all hot-plug so that i can rip the sub and amp's out, leaving the remaining speakers to be powered by the headunit as a kind of fail-over system meaning i wouldnt be left without a basic audio setup should i require the boot.

Cheers,

Andy

[Sonic]

Which wiring are you using?
parallel = 2ohm/2 = 1ohm =
Series = 2ohm x 2 = 4ohm = amp power halved

A sub with 2ohm DVC (2x 2ohm voice coils) in series = 4ohm impedance.

2x 4ohm in parallel (the 2 subs) = 2ohm impedance.

http://mobile.jlaudio.com/pdfs/10W3v2_MAN.pdf[/url]

I was going off http://www.bassjunkies.com/index.php...w=expand_image for the RMS figure of 250, but 300 is preferable tbh!

EDIT: that page does actually show 300w, whereas http://www.bassjunkies.com/?pid=3062...F&source=brand which i guess i was looking at is titled as 250w

Also that link to the PDF manual shows the wiring diagram for what id be doing running the multiple d2's in parallel.

[Fat Audi 80]

Good point there Dane. Andy will have to run them in series at 4 ohms then. It will still be more than enough bass for a small coupe.

I agree on the box design, difficult in the Coupe without using ALL of the boot etc especially with 2 subs.

[Sonic]

Good point there Dane. Andy will have to run them in series at 4 ohms then.

You need to factor in the DVC.

[Fat Audi 80]

I can see your logic there Andy. I like your idea regarding removing the amps and subs for occasional boot use, but how do you intend to easily rewire the speakers? You will have the amp driven wires coming from the boot and then headunit driven wires from up front. Have you some clever box in mind to manage the speaker supplies?

I would be tempted to advise you to use only one sub, as I find I have to turn mine down anyway. (Unless you want to blow the doors off the local boy racers with your stereo as well, then go ahead and run the 2 JL 10's.... )

Cheers,

Steve.

[borderS2]

Dvc

DVC?

[Fat Audi 80]

You need to factor in the DVC.

I thought the DV was 2 ohm total. I must admit though I was not really looking or reading that hard and jumped on what Dane has said.

You obviously know what you are talking about with Audio anyway so I will bow out now, unless you need any more info on amp racks and sub boxes.

[borderS2]

Audio wiring to boot

Did you have a cd changer or does the loom have the coaxial audio cables from the changer. You could hook these up in reverse.