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Subwoofer in series
Subwoofer in series
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Old 28th December 2017, 01:45 AM   #1
globalplayer is offline globalplayer  Germany
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Default 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, ... ?
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Old 28th December 2017, 02:20 AM   #2
nycavsr2000 is offline nycavsr2000  United States
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Subwoofer in series
See here:

Isobaric subwoofer box design - Advantages and disadvantages

Best,
Anand.
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Old 28th December 2017, 02:38 AM   #3
globalplayer is offline globalplayer  Germany
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Thanks.
Seems I need to go parallel for efficiency reasons.
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Old 29th December 2017, 01:30 PM   #4
TBTL is offline TBTL  Germany
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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.
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Old 29th December 2017, 09:15 PM   #5
Xoc1 is offline Xoc1  United Kingdom
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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
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Old 29th December 2017, 09:19 PM   #6
globalplayer is offline globalplayer  Germany
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Quote:
Originally Posted by TBTL View Post
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.
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Old 29th December 2017, 09:37 PM   #7
nycavsr2000 is offline nycavsr2000  United States
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Subwoofer in series
Quote:
Originally Posted by TBTL View Post
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.

Last edited by nycavsr2000; 29th December 2017 at 09:40 PM.
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Old 29th December 2017, 10:01 PM   #8
scottjoplin is offline scottjoplin  Wales
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I've been tempted by isobaric until I researched it, box volume is the only real advantage
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Old 29th December 2017, 10:02 PM   #9
globalplayer is offline globalplayer  Germany
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I read isobaric has lower distortion also.
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Old 29th December 2017, 10:07 PM   #10
scottjoplin is offline scottjoplin  Wales
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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
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