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1 Sub or 2 for X-Over at 80hz
1 Sub or 2 for X-Over at 80hz
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Old 31st January 2018, 02:57 AM   #1
tribute is offline tribute  Australia
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Default 1 Sub or 2 for X-Over at 80hz

Hi, I want to add a sub or maybe two to my system crossing over a say 80hz. At this frequency can you still define stereo. If not I should be able to get away with one sub, however if you can still hear stereo then I guess I need 2. Cheers
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Old 31st January 2018, 03:03 AM   #2
globalplayer is offline globalplayer  Germany
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Older recordings might have drums, bass, guitar, vocals etc. on separate tracks.
(Dusty Springfield - Son of a Preacher Man, The Mamas & The Papas - California Dreaming, etc. )

Today most engineers will mono mix at the low freqs.
Either 2 subs if you want true stereo or you sum the l/r signals via DSP or some circuit for a single mono sub.
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Old 1st February 2018, 12:00 AM   #3
mordikai is offline mordikai  United States
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I always do stereo (or more often 4 subs), just makes me feel better.
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Old 1st February 2018, 01:39 AM   #4
jplesset is offline jplesset  United States
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I have 4 subs, and have tested to see if I can hear stereo vs mono feed. With a 24db/oct crossover, I can not tell. With 12db crossover, I can localize the woofers easily.
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Old 4th February 2018, 07:07 PM   #5
bentoronto is offline bentoronto  Canada
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1 Sub or 2 for X-Over at 80hz
Quote:
Originally Posted by jplesset View Post
I have 4 subs, and have tested to see if I can hear stereo vs mono feed. With a 24db/oct crossover, I can not tell. With 12db crossover, I can localize the woofers easily.
+1

But the subs have to be pretty clean or they might divulge their location with any slope.

Datapoint: lived for decades with a Klipschorn bass corner horn in several homes... which, of course, needs to be in a corner, often far from main speakers. Never a localization issue on music, even with a 130 Hz Xover.
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Old 4th February 2018, 07:14 PM   #6
googlyone is offline googlyone  Australia
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1 Sub or 2 for X-Over at 80hz
a decent crossover slope at 80Hz will not be able to be located.
- I have used 24dB/octave and can sit right next to the sub in a nearfield monitor setup without noting it is at my left knee.
- The sub DOES need to have no rattles, port noise etc.
- I have not tried this at 12dB/octave, but reckon you would be very close to being totally insensitive.
- I mono the sub outputs from an active crossover in this application.

As a general rule I load in a pair of subs if I have the choice. More a matter ot power handling and headroom than absolute necessity. I still don't run them stereo, as there is no point.
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Old 4th February 2018, 08:48 PM   #7
silverprout is offline silverprout  France
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a decent crossover slope at 80Hz will not be able to be located..
...but your waveform will be totally distorded.
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Old 4th February 2018, 10:16 PM   #8
scottjoplin is offline scottjoplin  Wales
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Old 5th February 2018, 12:24 AM   #9
nigelwright7557 is offline nigelwright7557  United Kingdom
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I always listen to stereo mixed to mono on my amp.
It saves setting up two amps.
No crossovers just a full range speaker.
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Old 5th February 2018, 06:03 AM   #10
silverprout is offline silverprout  France
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Any particular reason?
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