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Old 27th August 2011, 12:36 PM   #1
johnr66 is offline johnr66  United States
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Default 105db @ 1w 35hz low power sub

Hey guys,
I see a lot of designs for big PA subs that can handle lots of power.
I'm looking for something that can produce 105db at 1 watt with an F3 at 35Hz, however, I don't need the massive power handling. My home made amp produces 25 watts of pre clipping power.

No one note wonder. It should be reasonably flat to 80Hz.
F3 range 33 - 38Hz, but definitely no higher. 35Hz ideal.
I guess it would be a TH or some other efficient topology.
Any suggestions?
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Old 27th August 2011, 12:49 PM   #2
Pano is offline Pano  United States
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105dB/W at 35Hz? It's going to be B-I-G. How much room do you have?
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Old 27th August 2011, 01:10 PM   #3
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Buy a new bigger amp it will be cheaper than all the extra wood needed to get that efficiency. Looking at horn resp your going to need many (approx 8) >112L boxes to achieve that... certainly possible but very space inefficient.
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Old 27th August 2011, 02:25 PM   #4
johnr66 is offline johnr66  United States
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I have a 6' (183cm) tall up and back TH with 12" driver doing about 98db. I know getting those few db extra can be a lot of effort. If it is more realistic to get to 100-102db, that is fine. Size is whatever it needs to be.
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Old 27th August 2011, 03:27 PM   #5
tb46 is offline tb46  United States
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Hi johnr66,

What placement, corner, against wall, or just use 2pi? 1W @ what driver impedance, 4 Ohm, 8 Ohm, or just use Eg=2.83V (in Hornresp)?

Regards,
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Old 28th August 2011, 03:08 PM   #6
johnr66 is offline johnr66  United States
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Quote:
Originally Posted by tb46 View Post
Hi johnr66,

What placement, corner, against wall, or just use 2pi? 1W @ what driver impedance, 4 Ohm, 8 Ohm, or just use Eg=2.83V (in Hornresp)?

Regards,
Half space and 1 watt/1 meter. I'm not looking for shortcuts like 2.83 volts into 4 ohms
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Old 28th August 2011, 05:31 PM   #7
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DIY 4 x 18" subwoofer - The Paper Horn by Inlow Sound
4x18" in a large bass reflex looks to be capable.
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Old 28th August 2011, 05:41 PM   #8
freddi is offline freddi  United States
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know U don't want to "compromise" but more amp power and a tapped horn sub of manageable size would be one tradeoff. Here's inroom response of a front horn called "The Monolith" built about 20 years ago for me by D.r Bruce Edgar when loaded with a defunct Dayton 295-070 (not real far off from a 2226) it had a nominal cutoff of 40.
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