Subwoofer in series

globalplayer · 28th December 2017, 01:45 AM

I would like to try a isobaric configuration using 2 identical 4 ohm woofers.
If I connect them in series to get 8 ohms what will happen to the sound, damping factor, Qts, Qes, Le, ... ?

nycavsr2000 · 28th December 2017, 02:20 AM

See here:

Isobaric subwoofer box design - Advantages and disadvantages

Best,
Anand.

globalplayer · 28th December 2017, 02:38 AM

Thanks.
Seems I need to go parallel for efficiency reasons.

TBTL · 29th December 2017, 01:30 PM

Efficiency (power out divided by power in) and sensitivity (sound pressure level divided by voltage on the terminals) are mixed up at that link. Efficiency halves when going from a single driver to an isobaric pair.

When using two woofers, series or parallel connection has no influence on efficiency. It does have an influence on impedance and therefore on sensitivity.

Xoc1 · 29th December 2017, 09:15 PM

You can model the enclosure in Hornresp and configure the driver as isobaric 2 series and 2 parallel. This should give you the data you need to find out what voltages will drive the speaker to the levels you require

globalplayer · 29th December 2017, 09:19 PM

Quote:

Originally Posted by TBTL

Efficiency (power out divided by power in) and sensitivity (sound pressure level divided by voltage on the terminals) are mixed up at that link. Efficiency halves when going from a single driver to an isobaric pair.

When using two woofers, series or parallel connection has no influence on efficiency. It does have an influence on impedance and therefore on sensitivity.

Thanks for clarifying.

nycavsr2000 · 09:40 PM

Quote:

Originally Posted by TBTL

Efficiency (power out divided by power in) and sensitivity (sound pressure level divided by voltage on the terminals) are mixed up at that link. Efficiency halves when going from a single driver to an isobaric pair.

When using two woofers, series or parallel connection has no influence on efficiency. It does have an influence on impedance and therefore on sensitivity.

Yup. Thanks for clarifying. I only skimmed it but it seemed to have what the OP wanted.

I’ve never played with Isobaric personally...interesting from an academic standpoint!

Best,
Anand.

scottjoplin · 29th December 2017, 10:01 PM

I've been tempted by isobaric until I researched it, box volume is the only real advantage

globalplayer · 29th December 2017, 10:02 PM

I read isobaric has lower distortion also.

scottjoplin · 29th December 2017, 10:07 PM

Yes, you can get some non linear distortion cancellation, however if you use the two drivers normally the excursion is less for the same output which means lower distortion

28th December 2017, 01:45 AM	#1
globalplayer diyAudio Member Join Date: Oct 2014 Location: =)	Subwoofer in series I would like to try a isobaric configuration using 2 identical 4 ohm woofers. If I connect them in series to get 8 ohms what will happen to the sound, damping factor, Qts, Qes, Le, ... ? __________________ ◢◣◢◣◢◣◢◣◢◣

28th December 2017, 02:20 AM	#2
nycavsr2000 diyAudio Member Join Date: Jul 2004 Location: North Carolina	See here: Isobaric subwoofer box design - Advantages and disadvantages Best, Anand. __________________ My system: http://www.audiocircle.com/index.php...ms;system=1184

28th December 2017, 02:38 AM	#3
globalplayer diyAudio Member Join Date: Oct 2014 Location: =)	Thanks. Seems I need to go parallel for efficiency reasons. __________________ ◢◣◢◣◢◣◢◣◢◣

29th December 2017, 10:01 PM	#8
scottjoplin diyAudio Member Join Date: Dec 2015 Location: Penrhyndeudraeth	I've been tempted by isobaric until I researched it, box volume is the only real advantage __________________ Woofer Assisted Wideband is the New Testament renounce the anachronistic acronym FAST

29th December 2017, 10:02 PM	#9
globalplayer diyAudio Member Join Date: Oct 2014 Location: =)	I read isobaric has lower distortion also. __________________ ◢◣◢◣◢◣◢◣◢◣


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29th December 2017, 01:30 PM	#4
TBTL diyAudio Member Join Date: Oct 2013	Efficiency (power out divided by power in) and sensitivity (sound pressure level divided by voltage on the terminals) are mixed up at that link. Efficiency halves when going from a single driver to an isobaric pair. When using two woofers, series or parallel connection has no influence on efficiency. It does have an influence on impedance and therefore on sensitivity.

29th December 2017, 09:15 PM	#5
Xoc1 diyAudio Member Join Date: Nov 2008 Location: Devon UK	You can model the enclosure in Hornresp and configure the driver as isobaric 2 series and 2 parallel. This should give you the data you need to find out what voltages will drive the speaker to the levels you require

29th December 2017, 10:07 PM	#10
scottjoplin diyAudio Member Join Date: Dec 2015 Location: Penrhyndeudraeth	Yes, you can get some non linear distortion cancellation, however if you use the two drivers normally the excursion is less for the same output which means lower distortion __________________ Woofer Assisted Wideband is the New Testament renounce the anachronistic acronym FAST

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