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Old 4th April 2004, 07:13 PM   #1
SQ Kid is offline SQ Kid  United States
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Default crossover for 2.1 setup

i tried searching a bit for this, but couldnt really find what i was looking for. for my current setup, i've got a pair of w871s's running off of my pc 2.1 setup. what i'm trying to do is use a pair of gc's to run 2 speakers and a sub. is there a passive crossover that will allow stereo hi-pass (around 100-150 hz) but allow both channels to combine for the low pass? all the speakers are going to be 8 ohm, so that makes it a little bit easier on the surface, but i'm sure i'm missing something else. thanks
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Old 4th April 2004, 09:53 PM   #2
joensd is offline joensd  Germany
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Hi,
got the same problem at the moment.
Built a pair of Tangbands and am about to add subwoofer for the low end.
As I need some bass boost/correction Iīd love to have a nice plate amp but looking at the good models they arenīt cheap.
The ones being cheaper have underrated transformers and are also cheaper produced....

1 So your alternatives could be a plate amp.
Some of them (actually "most") have high power inputs so you input directly from your gainclone.
From the high input it goes directly (in some of the nicer plate amps with high pass) to the high power out thatīs where youīll connect your tangbands.
The plate amp will sum right and left signal and power the sub.

2 If you donīt need any correction/boost for your sub Iīd suggest a 6dB high-pass on your tangbands with just a capacitor and a passive low pass for your sub as well.
As you have enough amps coming up thatīd be the cheapest solution.

3 You could build an active crossover and summing circuits to feed three gainclones to get your setup going.

Whatever you decide to do, you should definitely high pass the tangbands to be able to get more power out of your system.

Cheers
Jens
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Old 4th April 2004, 09:56 PM   #3
SQ Kid is offline SQ Kid  United States
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i'm trying to stay away from having a 3rd amp. and i do understand how to make a passive xover, i just dont know if theres a certain way to allow a summed lowpass (left and right channels low pass to a single sub)
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Old 4th April 2004, 10:54 PM   #4
r0cket- is offline r0cket-  United States
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Quote:
Originally posted by SQ Kid
i'm trying to stay away from having a 3rd amp. and i do understand how to make a passive xover, i just dont know if theres a certain way to allow a summed lowpass (left and right channels low pass to a single sub)
Get a dual voice coil sub and hook one voice coil up to each channel? Seems to be a popular strategy for the cheap passive subs I've worked with, anyway.
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Old 4th April 2004, 11:03 PM   #5
SQ Kid is offline SQ Kid  United States
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ive always been under the assumption that hooking up two different signals up to two different coils on the same sub can be bad for the sub.... besides, i was looking at a couple subs in particular (more TB to match the speakers) and they're all svc
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Old 5th April 2004, 01:00 AM   #6
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Quote:
Originally posted by SQ Kid i just dont know if theres a certain way to allow a summed lowpass (left and right channels low pass to a single sub)
You know SQ, that's funny because I used to use the 15" woofer you see, about 20 years ago in a single woofer, dual passive radiator set-up with the L + R strapped and ruddy bejabbered if I can remember how it was wired so as not to cause any problems. The wiring came out of a old book "How to Build Loudspeakers" that I no longer have. I just jotted a few ideas down on paper and I can't make it work. True enough it did though, because it ran for about 8 years. It was called "the coffin"

The woofer has an inverted half roll, treated cloth surround, if you can't see it in the pic

Anybody want to guess who's name was on the back of that woofer? (It was a sticker, not a stamp, so I can't be sure who the OEM was)

Cal
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Old 5th April 2004, 01:12 AM   #7
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Default Re: crossover for 2.1 setup

Quote:
Originally posted by SQ Kid
is there a passive crossover that will allow stereo hi-pass (around 100-150 hz) but allow both channels to combine for the low pass?
Have you read this yet?

http://www.t-linespeakers.org/tech/f...ssiveHLxo.html

Quote:
Originally posted by SQ Kid
ive always been under the assumption that hooking up two different signals up to two different coils on the same sub can be bad for the sub.... besides, i was looking at a couple subs in particular (more TB to match the speakers) and they're all svc
1) No, putting L to one VC and R to the other VC is perfectly correct usage.
2) If you are going to buy TB sub drivers, you may just want to buy 2. You likey will wind up spending a lot more than $US30 worth of effort+grief to get your one passive sub channel working, and one 8" sub just cannot produce copious bass anyways.
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Old 5th April 2004, 09:48 AM   #8
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Quote:
i'm trying to stay away from having a 3rd amp.
i had a similar case as you, but i just decided to get a 3 way active crossover and an old 480 watt, 55 pounder of a receiver.
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Old 5th April 2004, 03:15 PM   #9
SQ Kid is offline SQ Kid  United States
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yeah, i've got the amps (8 total channels of gc sitting and waiting to get used), but this is gonna be for a dorm room computer setup. and i was also hoping to use the other 6 channels for a ht setup. i dont need any kinds of crazy bass; i've been used to the 4 or 5" cambrige soundworks sub that came with my 4.1 pc setup.
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