Powering bi-pole woofers

Nuuk · 29th November 2003, 09:00 AM

I want to use bi-pole woofers on each channel so will be buying four (probably) 15 inch 4 ohm drivers.

But which is the best way to power them? I want to use chip amps so the options seem to be:

A single amp for each driver a la Linkwitz.

Wiring each pair in parallel from one amp. (For an 8 ohm load)

The amp options are 'basic' amp, bridged, parrallel or both.

For simplicity I would prefer the one amp per driver with something like a 3886 chip but welcome any suggestions from those more experienced in these issues.

At present, it looks like the drivers that I will be using have the following T/S parameters:

FS 30Hz
Qts 1.2
Qms 4.55
Qes 1.78
Re 3.8 ohms

wintermute · 29th November 2003, 09:11 AM

Hi Nuuk,

Just a correction. If you wire each pair in parallel you will have a 2 Ohm load not an 8 ohm load, you will have to wire them in series if you want an 8 ohm load.

Regards,

Tony.

Nuuk · 29th November 2003, 11:18 AM

Thanks Tony - I have been messing around with caps to make up a crossover for the last couple of days and have parallelling caps on the brain. Of course, it should be series to get 8 ohms!

planet10 · 29th November 2003, 06:26 PM

Use 4 amps

dave

Nuuk · 29th November 2003, 08:41 PM

Quote:

Use 4 amps

Thanks Dave- just the simple answer that I was hoping for!

Will the 3886 (well four of them) be up to driving these 15 inch beasties?

planet10 · 29th November 2003, 09:12 PM

Quote:

Originally posted by Nuuk

Thanks Dave- just the simple answer that I was hoping for! Will the 3886 (well four of them) be up to driving these 15 inch beasties?

Should be. I got sufficient levels with a single Shiva and 2x20W out of my NAD 7020... you'll have a lot more gumption than that. I plan of 4 chipamps (~25W each) to drive my 4 Foster 12s in a pr of push-push TLs.

dave

Nuuk · 29th November 2003, 09:25 PM

Thanks again Dave, time to draw up a shopping list and get the tools sorted!

zygibajt · 29th November 2003, 11:29 PM

Nuuk

What are the drivers that you will finally use?

Bartek

Nuuk · 30th November 2003, 08:07 AM

Quote:

What are the drivers that you will finally use?

At present the most likely candidates are the 15 inch drivers shown
HERE at CPC

FS 30 Hz, Qts 1.2, and around 34UKP. They are apparently made by Monacor.

planet10 · 30th November 2003, 09:00 AM

Quote:

Originally posted by Nuuk
Qts 1.2

Planning a VERY large box?

dave

29th November 2003, 09:00 AM	#1
Nuuk diyAudio Member Join Date: Feb 2003 Location: Somerset, SW England	Powering bi-pole woofers I want to use bi-pole woofers on each channel so will be buying four (probably) 15 inch 4 ohm drivers. But which is the best way to power them? I want to use chip amps so the options seem to be: A single amp for each driver a la Linkwitz. Wiring each pair in parallel from one amp. (For an 8 ohm load) The amp options are 'basic' amp, bridged, parrallel or both. For simplicity I would prefer the one amp per driver with something like a 3886 chip but welcome any suggestions from those more experienced in these issues. At present, it looks like the drivers that I will be using have the following T/S parameters: FS 30Hz Qts 1.2 Qms 4.55 Qes 1.78 Re 3.8 ohms __________________ The truth need not be veiled, for it veils itself from the eyes of the ignorant.

29th November 2003, 09:11 AM	#2
wintermute just another diyAudio Moderator Join Date: Aug 2003 Location: Sydney Blog Entries: 22	Hi Nuuk, Just a correction. If you wire each pair in parallel you will have a 2 Ohm load not an 8 ohm load, you will have to wire them in series if you want an 8 ohm load. Regards, Tony. __________________ Any intelligence I may appear to have is purely artificial! Some of my photos

29th November 2003, 11:18 AM	#3
Nuuk diyAudio Member Join Date: Feb 2003 Location: Somerset, SW England	Thanks Tony - I have been messing around with caps to make up a crossover for the last couple of days and have parallelling caps on the brain. Of course, it should be series to get 8 ohms! __________________ The truth need not be veiled, for it veils itself from the eyes of the ignorant.

29th November 2003, 06:26 PM	#4
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	Use 4 amps dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

29th November 2003, 09:25 PM	#7
Nuuk diyAudio Member Join Date: Feb 2003 Location: Somerset, SW England	Thanks again Dave, time to draw up a shopping list and get the tools sorted! __________________ The truth need not be veiled, for it veils itself from the eyes of the ignorant.


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29th November 2003, 11:29 PM	#8
zygibajt diyAudio Member Join Date: Jun 2003 Location: Wroclaw	Nuuk What are the drivers that you will finally use? Bartek

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