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Old 24th April 2006, 19:27   #1
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Default Connecting an active sub without Pre-amp out

Hey guys...need some help in connecting an active sub...

Present system
Pioneer HU + 12 disc changer
HU does not have Pre-amp out
4 crap pioneer speakers

Want to add:
Blaupunkt VPc component speakers (2 pairs)
Blaupunkt ODsb 8000A (active sub)

Now, how do I connect the sub?
The only way I can think of is to parallel the rear spealer wire, with one going to the active sub.
The other goes to a "high pass filter" and from that to the "crossover" of the component system.

Any other easier way? Can i buy some kind of adjustable cross-overs that will send the lows to the woofer and everything else to the speakers

(To guy that suggests I change the HU )
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Old 24th April 2006, 19:53   #2
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Quote:
Originally Posted by epyupc
HU does not have Pre-amp out

Are you sure the Hu does not have pre am out ???

I thought it should have at least one...
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Old 24th April 2006, 20:11   #3
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http://www.pioneerelectronics.com/pn...etailComponent
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Old 24th April 2006, 22:01   #4
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there is one pair of rca out in ur head unit try connecting the active sub there and for the componets use in hu amp

or

connect a new amp ( for the componets) with a y lead to give the rca to both the active sub woofer and the amp for the componets.

Last edited by low_bass_makker : 24th April 2006 at 22:03.
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Old 24th April 2006, 22:03   #5
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Default Duh

Quote:
Originally Posted by epyupc

Dude... The link you posted...



Your HU has one RCA preout. Or am I missing something you're saying?
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Old 24th April 2006, 22:16   #6
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glug! a cassette player taht costs 160$ !!!
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Old 24th April 2006, 22:18   #7
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Ok going Highly off topic here...

What is the minimum number of RCA preouts a HU should have (ok even the cheapest ones you get for 1.5k) ???

Can the audio gurus please clarify ???
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Old 24th April 2006, 22:34   #8
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Quote:
Originally Posted by gunbir
Dude... The link you posted...



Your HU has one RCA preout. Or am I missing something you're saying?
Thanks for that... I didn't know that could be used. Thought i needed a specific SW out. It makes sense...my woofer has a crossover...all i need is a full out.

1) Now how do power the sub?
Will it be a problem if it is on whenever the car is running?

2) How do I prevent the rears from getting the low freqs?

3) Any hi pass filters that cut out below 150hz available locally?
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Old 24th April 2006, 22:51   #9
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Quote:
Originally Posted by epyupc
1) Now how do power the sub?
Will it be a problem if it is on whenever the car is running?
You need an amp wiring kit. or loose power cabling.
- Positive - cable from your battery +tive terminal (including a fuse) to your amp
- Ground - cable from a good ground point near the amp
- Remote - cable from the HU's remote output (theres a yellow cable behind your HU) to your amp. Connecting the remote cable to your amp will

Quote:
Originally Posted by epyupc
1)2) How do I prevent the rears from getting the low freqs? Any hi pass filters that cut out below 150hz available locally?
You can make your own... lot of info on the net...
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Old 24th April 2006, 23:31   #10
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Quote:
Originally Posted by gunbir
Remote - cable from the HU's remote output (theres a yellow cable behind your HU) to your amp. Connecting the remote cable to your amp will
Oops I didnt finish that...

.... Connecting the remote cable to your amp will ensure the amp (or active sub in your case) will turn on and off with your HU, as in switch on /off automatically when your HU switches on and off.
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Old 25th April 2006, 00:04   #11
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Quote:
Originally Posted by cooldude1988765
Ok going Highly off topic here...

What is the minimum number of RCA preouts a HU should have (ok even the cheapest ones you get for 1.5k) ???

Can the audio gurus please clarify ???
1.5K units?? What units are these bhai? lol

Minimum ofcourse is ONE pair of RCA outs. Not much you can do with this. Even if you split it and use it for the rear and front/subwoofer, you will have no control over the lelels and fading and you might even get "ground loop" buzzing, which is very annoying under any circumcisions.

For good quality amplified sound you need atleast 2 pairs (front and rear out) but with 3 pairs (front, rear and subwoofer out) you can have great control.
But with that comes great responsibility.
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Old 25th April 2006, 09:12   #12
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Quote:
Originally Posted by gunbir
You need an amp wiring kit. or loose power cabling.
- Positive - cable from your ba.......
Thanks for the help. I will check if that yellow wire is present.



Quote:
Originally Posted by gunbir
You can make your own... lot of info on the net...
You've got to be kidding...here i am getting awfully muddled up wiring my own sub, and you want me to make my crossover.
Anyways...crossovers here i come...wikipedia here i come i mean
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Old 25th April 2006, 09:16   #13
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Quote:
Originally Posted by Sam Kapasi
1.5K units?? What units are these bhai? lol.
These are readily available atleast in hyderabad. They are pioneer(of course locally made). Only cassette, no radio too and have 7 band eq. AND of course no LCD screen.

Quote:
Originally Posted by Sam Kapasi
For good quality amplified sound you need atleast 2 pairs (front and rear out) but with 3 pairs (front, rear and subwoofer out) you can have great control.
But with that comes great responsibility.
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Old 25th April 2006, 09:19   #14
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the simplest XO you can buy are the PLLXO made by FMod. they are cheap (about $29 a pair) and fixed at 12db but they work.

I thought the active Blau sub you are using has a XO built in. why not use that.
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Old 25th April 2006, 10:34   #15
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Quote:
Originally Posted by navin

I thought the active Blau sub you are using has a XO built in. why not use that.
I need another another crossover(high pass) since i don't want the rear speakers to get anything below 150hz.
My rears are puny 5" comps. Thats all i can fit in the space i have (octy)
I don't want to even try getting low-bass from those.

The fronts are 6 1/2" and hopefully will handle it .

Quote:
Originally Posted by navin
the simplest XO you can buy are the PLLXO made by FMod.
Any link... googling didn't help

Last edited by epyupc : 25th April 2006 at 10:37.
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