PGMabley

Hi Chaps

Could someone please help me as I have not had a lot of luck at my local car stereo shop.

They tried to fit a double 10" box on the two spare channels on my Blaupunkt 4x80W amp but it didnt work - the reason they gave was that the full range of sound was going to the sub box and therefore sounded dreadful - I asked if they could put a passive crossover in after the amp but they said it wasnt possible and I needed a two channel amp on top of the 4 channel.

I think it is possible to put the crossover in after the amp - I am now thinking of bridging the two spare channels and sending this to a single box as the double box did not leave enough room for golf clubs!

Any advice out there??

Thanks
Paul

robski

There is two ways round this, a large coil after the amp will "low pass" the bass only, pro-plus do one, but because of the power it is having to handle, they are something like £15 (per channel cos they are mono).
You say you have a 4 channel amp, I am assuming you have two sets of RCA inputs, maybe 1 running from the head unit, and a splitter to make it into 4 channels. You can buy low pass RCA converters, which do the same as the coil, but before it enters the amp. This are rarer, and I cannot comment as to whether they are better.
Actually just hit me (doh!), for about 30-40 you should be able to buy a small active crossover which will take 1 RCA input, and allow 2-3 RCA outputs. These usually allow something like a front, rear and sub output, with some limited gains. I would go this way, well worth the cost.

let me know if you need more info (mail direct), and I will have a word with one of my mates who is an audio installer for you.

Andy Tang

iTrader: (3)

I was running two 10" Rockford Fosgates off two spare channels on my Alpine amp. The amp was only rated at 4*40w (rms @12v) but it still kicked out a lot of bass. The amp had a built in crossover which I assume your amp doesn't.

You can go a few ways:

1) Get two coils which will act as a passive crossover. Try to get something that will cut at 80-100Hz. You'll need two, one of each sub.

2) If the amp will cope, then bridge the two channels for a single sub. What size and configuration will depend on what sort of music you listen to. I prefer the sound of a smaller cone in a sealed box. Lot's of quick bass, but taking up the minimum space in the boot. I personally would only go for a 10" or 12"

3) Run the two spare channels for the rear speakers, and get a bigger amp for the subs.

Which ever way you go, a good stereo shop will be able to tell you the virtues of each of the setups.

Hope this helps
Andy

PGMabley

Brilliant, thanks chaps!

Paul

PGMabley

Hi chaps

Have now installed a 10" CB100 Vibe directly from the amp as I found out it had subwoofer capability after all!!

Have not a clue what my installer was going on about in the first place - it was an easy diy job.

Now sounds champion!!

Cheers
Paul