Audio setup advice

[Jamo]

Don't use the HU. It will sounds pants in comparison to the amplifier.

I see nothing wrong with those settings. I have variable crossovers on my Amp, so can play with the settings a little more and "tune" it by ear a little if I want to.

You will be fine with what you have suggested.

IMO, the biggest influence on a good system will be the design of your sub box, ported will sound different to sealed (what are your subs designed to run with?)

Cheers,

Steve

It's Alpine mate they sound better than using the amp.

I have a 7998r and Genesis Amp and it sounds a lot better crossed over at the head unit.

[Jamo]

Yeah the sub amp is a monoblock, 2ohm stable.

The amp's have filters on them, so if i set the sub LPF to 80, the 5.25" HPF to 80 and the 4" HPF to 125 that will give me the desired split?

Or should i just use the HU...

My preference is head unit as head units you can adjust the slope of the crossover and get better cross over points to the music.

I tend to find amp cross overs inferior, I only turn them on for the sub and set it at 100hz and fine tune from the head unit.

Either way will work.

[Sonic]

I guess i can play with both and see which sounds better

The box obviously depends on how you want the sound, ported will give you a lower range but sealed a tigher response - which is what im after.

Manufacturer recommended sealed enclosure:

volume:
0.625 ft³
17.7 litres

dimensions:
18 in. x 11 in. x 9 in.
457 mm x 279 mm x 229 mm

[Fat Audi 80]

It's Alpine mate they sound better than using the amp.

I have a 7998r and Genesis Amp and it sounds a lot better crossed over at the head unit.

Doh, I mis interpreted Andy, I thought he meant use the HU on board amp to supply the speakers!!!

If you can filter the RCA signals using the headunit do it!

Cheers,

Steve.

[Fat Audi 80]

Manufacturer recommended sealed enclosure:

volume:
0.625 ft³
17.7 litres

dimensions:
18 in. x 11 in. x 9 in.
457 mm x 279 mm x 229 mm

Then that is what you must make!

I am looking forward to seeing and hearing the results of this project. I am sure it will then dwarf my system.

[Rusty]

Sonic, that box I made you is somewhere in the 30l region so perfect for a pair of those subs. If you extend it then even better. You're really pressed for space so just make it fit with the desired volume. If you make the current box longer then it should be around 35l. It's not a particularly exact art when you're pressed for space, fair enough in an SPL car you'll want it all perfect but in the S2 just get what you can.

[borderS2]

Speaker box calculator

Here's a nice little calculator

http://www.kbapps.com/audio/speakerdesign/calculators/Default.htm

Just fill in your speaker spec
Dane

[Sonic]

Ive ordered all the stuff apart from the sub's now, ill be fitted the HU, cables and speakers over the next few weeks, leaving the subs and amps to be fitted along with fabrication of their enclusures when i get back from the ring.

Im planning on running the following cables down the drivers side:

6x RCA (3x stereo)
6x speaker cable (3x stereo, FR, FL and RR, the RL will have a socket but run under the seats)
1x Power Remote (12v)
8x speaker cable (4x stereo from the HU amp)

They will all be terminated in the boot with sockets on the side, allowing me to run seperator cables to the amps and disconnect the amp floor easily. The speaker cable from the HU amps is to let me easily connect the speakers up to the headunit when i remove the amp's.

The problem is that there are a fair few cables there. Im not sure how much space is available, but might need to look into into running flat speaker cables.

I will obviously be running sheilded RCA, but would i need to do the same with the 7 stereo speaker cables? Also, could i just use a 3.5mm mono or phono connector/socket for the 12v power remote?

Cheers

[Jamo]

Run them down the centre under the console in the Coupe then split them to run up either side of the seat into the boot.

[Sonic]

Is there room under the carpet after the console ends?

[Jamo]

Yes you go under the fireproofing

[Rusty]

When I wired mine up I took the seats out and lifted the carpet to get to the original cable runs... was fine on the driver's side but passenger side had a power cable so I think there was an issue there. HTH

[Jonas_R]

Run the power cable opposite of the signal and speaker cables to avoid interference. And don't let the power cable or ground cable cross the signal calbes (RCA). You don't need to buy shielded speaker cable.

And 3.5mm cable should be fine for remote.

Also remember to make the ground cable as short as possible and choose a size that is equal to or perhaps bigger then the power cable. Also remember to grind away paint etc. where you attach the ground cable.

When I did my install I used the same method as Jamo suggested no problems what so ever.

[borderS2]

3.5 jack or Phono(RCA)

Is this purely switching a relay?
If not, both of these types of plug are able to be shorted out when connecting.
Dane

[Sonic]

Is this purely switching a relay?
If not, both of these types of plug are able to be shorted out when connecting.
Dane

I was asking if an 3.5mm jack or phono connector would be OK for the 12v power signal from the head unit.

I.e the speakers could be connected with bananna connectors so i could disconnect them easily and remove the amp, would a 3.5mm or phono connector be right for the power signal?