loudsubz

I have an older receiver and I was thinking of maybe using it to power a sub.

I have a home theatre receiver as well and I was going to use the suboutput from the HT amp, and connect it to the input on my older receiver to power a sub.

Question though I would need a crossover on the RCA to filter out the high freq. Anyone have a link to a site to build active crossovers? I have a power supply I can use for power.

Also is it even worth while for this idea? Or should I just buy a plate amp with crossover built into it. I was planning on running dual 10" 8 ohms subs on each channel ( 100 watts X 2 )

chev2

Most home theater recievers have a xover on the sub channel. Weither it is adjustable (Or fixed at 100hz) depends on your reciever.

[ November 25, 2003, 09:08 AM: Message edited by: chev2 ]

lemonlime

I used an old JVC receiver from the mid 80s to power car audio subs in the past. What I did was get a basic car audio 12v active x-over, and use a basic 12v AC adapter. The adapter had a maximum output of only 750mA, but most active x-overs do not have a high current draw. It had a 6db boost at 45Hz too which was fun [img]smile.gif[/img] Prior to using that, I had used two large passive coils in series. The difference was night and day.

loudsubz

would it work fine do you think? Like an amp is an amp? as long as Im powering the subs it should be fine whether I use the receiver or plate amp?

maltesechicken

Yes it should work fine. The subs that you are using are nice and safe too, each rated at 8 ohm. That impedance will be just fine for your receiver. What you could do is (as mentioned above) get a car active crossover and wire it with a 12vdc transformer (I've done that with 500 mA before and it worked fine) or you could also use a passive crossover (ie a sub coil) Sub coils can be purchased for about $10-15 each for about 100 wrms (I think - I haven't priced them out for several years now). The only drawback of sub coils is the cross over point is not adjustable. The only way you can adjust the cross over point is by adding more coils in series or parallel, depending on which way you want to adjust the frequency.

But you will have no problems running them off the home receiver. Maybe even build a band-pass box and place that box behind a couch or something and you might not even need a cross over.

maltesechicken

Sorry I was wrong. Here is a subcoil from Rat Shack. It was more expensive than I thought, but Rat shack usually is.

Seahag

http://sound.westhost.com/projects-3.htm

very cool site. TONNES of info there

abnormal72

Princess auto has there active sub crossovers for $10.00

They run of 12 volts so youd have to pick up a 12v adapter for a couple of bucks as well.

lemonlime

The only real problem with using car audio subs with home audio receivers is the driver resistance. Most home audio equipement is designed to operate with 8ohm speakers. Car audio drivers are usually 4ohms or lower. Most receivers will not have too much trouble operating with 4ohm loads, however you may want to refrain from extended high volume listening sessions [img]smile.gif[/img]

Passive coils in that type of environment are not the greatest. I had two in series (I cannot remember the specifications), which yeilded a 150Hz crossover frequency. The slope was so gradual that a lot of midrange made it through to the sub.

Haunz

iTrader: (3)

If you are going for passive, I'd look for parts from mouser or say global electronics in missisauga..... (probably way cheaper then rat shack!!!)I'd go at least 2nd order.... find a calculator online with various allignments.....

If you want active you can certainly find X-overs for 120V use.... I'd ask around pro-audio shops.... last one I bought was a audio-control 3-way X-over with adjustable high/mid/sub outs @ 24db/octave used for $80 + tax....

[ November 26, 2003, 01:15 AM: Message edited by: Haunz ]