How many subs can be driven with a single mono amp? - diyAudio
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Old 7th January 2016, 03:08 AM   #1
Rob41 is offline Rob41  United States
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Default How many subs can be driven with a single mono amp?

Sorry if this has been covered elsewhere but I have been unable to find a clear answer.

Without getting too technical, how many subs can I drive with a single mono amp?

This is for a home audio system employing a summed signal distributed bass system 70-75Hz and below.

I plan to use 4 enclosures each housing two 15" Dayton subs so there will be 8 subs.

I can use 2 mono amps if necessary. The driver I plan to use is this:
Dayton Audio RSS390HF-4 15" Reference HF Subwoofer 4 Ohm

Thanks in advance,
Rob
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Old 7th January 2016, 03:45 AM   #2
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depends on the minimum impedance your amp can handle and how much power it can supply before clipping imo
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Old 7th January 2016, 04:00 AM   #3
infinia is offline infinia  United States
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depends on the amp and SPL levels expected , target 8 ohms nominal for a home grade amp and 4 ohms for a pro grade. so 2 subs in series for 8 ohms per box and 4 subs total in series parallel combination giving 4 ohms for the pro grade E.g. use 2 boxes in parallel.
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Old 7th January 2016, 04:03 AM   #4
Rob41 is offline Rob41  United States
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I'd be using eight 4 ohm drivers in series/parallel to end up with to end up with a 4 ohm load.

I think the power I can supply may be the determining factor and with these drivers power handling capabilities I think I'm going to need more amps.
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Old 7th January 2016, 04:06 AM   #5
Rob41 is offline Rob41  United States
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Quote:
Originally Posted by infinia View Post
depends on the amp and SPL levels expected , target 8 ohms nominal for a home grade amp and 4 ohms for a pro grade. so 2 subs in series for 8 ohms per box and 4 subs total in series parallel combination giving 4 ohms for the pro grade E.g. use 2 boxes in parallel.
Right, I think I'll be okay if I use two Crown Xti 4002 amps. Perhaps 4 in the Xls line run mono would be a better fit to provide more headroom. I only need a max of around 105db on peaks so any of it would likely be overkill but I'm okay with that.
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Last edited by Rob41; 7th January 2016 at 04:12 AM.
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Old 7th January 2016, 04:12 AM   #6
infinia is offline infinia  United States
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yes Crown is a pro name brand
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Old 7th January 2016, 04:17 AM   #7
Rob41 is offline Rob41  United States
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I don't have the skills to build my own amps and something like the Crown amps would be within my price range.

I use a Nikko Alpha 650 to drive my bass right now which would not be enough for what I'm planning.

I use a Heathkit AA-1800 and a Heathkit AA-1600 with a MiniDSP to drive a pair of open baffle line array's I built.
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Old 7th January 2016, 04:27 AM   #8
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Using series-parallel connections the only upper limit to the number of subs is your sanity. You can keep the impedance the same.

With 8 4ohm subs your practical impedance options are 8 or 2 ohm. I'm not seeing how you can end up with a 4 ohm load. Pretty sure you cant.
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Old 7th January 2016, 04:31 AM   #9
Rob41 is offline Rob41  United States
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Thanks for the heads up on my miscalculations. Looks like I'll be going with 8 ohms.

It's not for HT and I don't need it to be insanely loud. Just accurate and evenly distributed. Perhaps I should consider scaling down to 12" drivers.
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Old 7th January 2016, 04:35 AM   #10
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Yes, you're buying quite the load of displacement, and doesn't sound like you're trying to fill an auditorium. I'd vote going to 4 cabinets of 15's rather than 4 cabinets of 2x12. Back to 4 ohms.
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