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Old 13th June 2015, 04:09 PM   #1
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Default running subs in series -side affects?

I have 2 identical unmarked 12" sub single voice coil drivers in sealed 2 cu ft boxes. Passive subs. They have an odd impedance. Either 3 or 6. Lost the email from the manufacturer. I'll try to get that info again. Anyway, they are for my home theater. I have a BASH 300 watt plate amp from parts express. Driving one of these woofers with the BASH, I'm getting "matching" levels from it using receiver test tones (mains and sub are at 0db in receiver) with the BASH volume knob at 1/3.

Here's the question... If I wanted to "test" running the two passive subs (placed beside each other) in series from the single BASH amp, would there be any affect on the frequency response from the woofers due to changes in T/S parameters?
Also, my understanding is that due to doubling the impedance, the amp will put out 1/2 less power, but since it's going to two 12" woofers (twice the radiating surface versus one 12") the volume level I'm hearing now shouldn't change much, even if leaving current amp volume knob at 1/3. Correct? My idea is that I may get more headroom and less distortion from two subs vs one.
Thanks!!
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Old 13th June 2015, 04:19 PM   #2
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I've personally voted for multiple subs, currently running 4 10". Series is fine, no worries. Since my subs are 4 ohm, I run two in series on each channel of my amp.
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Old 13th June 2015, 04:29 PM   #3
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Quote:
Originally Posted by jplesset View Post
I've personally voted for multiple subs, currently running 4 10". Series is fine, no worries. Since my subs are 4 ohm, I run two in series on each channel of my amp.
Thanks. But in your situation, the amp is still seeing the a 4 ohm load.

My questions are-
1- since using 2 subs vs 1, will current volume level I hear with volume setting of 1/3 change? Amp is putting out less power but to twice the radiating surface area.
2- will running the subs in parallel change their T/S parameters and change their frequency responses with them being in the properly sized sealed boxes for being run individually now?
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Old 13th June 2015, 04:33 PM   #4
sreten is offline sreten  United Kingdom
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Hi,

The volume will be identical. The parameters won't change.
Separate spacing is probably a good idea for smoother bass.
1/3 along the rear wall and a 1/3 down the opposite side wall.

The amplifier should be fine with two 6 ohm subs in parallel.
If they are 3 ohm best used in series. Might be worth looking
at the bass boost options for your sealed boxes :
http://www.parts-express.com/pedocs/...tion-guide.pdf

rgds, sreten.

Last edited by sreten; 13th June 2015 at 04:39 PM.
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Old 13th June 2015, 04:35 PM   #5
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You can have a look at usual theoretical calculation regarding Qe, Qm, Qt.
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Old 13th June 2015, 04:41 PM   #6
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Quote:
Thanks. But in your situation, the amp is still seeing the a 4 ohm load.
Um, no. Two woofers in series for each channel of a stereo amp, as stated....
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Old 13th June 2015, 04:52 PM   #7
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Quote:
Originally Posted by jplesset View Post
Um, no. Two woofers in series for each channel of a stereo amp, as stated....
I only half read your post. I thought u wrote u ran each pair in series and then ran those 2 pairs in parallel. Sorry.
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Old 13th June 2015, 04:54 PM   #8
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Quote:
Originally Posted by sreten View Post
Hi,

The volume will be identical. The parameters won't change.
Separate spacing is probably a good idea for smoother bass.
1/3 along the rear wall and a 1/3 down the opposite side wall.

The amplifier should be fine with two 6 ohm subs in parallel.
If they are 3 ohm best used in series. Might be worth looking
at the bass boost options for your sealed boxes :
http://www.parts-express.com/pedocs/...tion-guide.pdf

rgds, sreten.
Thank u very much! I'll try it out tonight.
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