HT sub Suggestion needed for this driver - diyAudio
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Old 17th January 2009, 11:21 AM   #1
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Smile HT sub Suggestion needed for this driver

Any suggestion is welcome.

What I want is a small foot print design if possible.

I have 2 of these 8ohm 10" woofer paper cone:

Fs -->65Hz
Qts ->0.65
Qms ->3.70
Qes ->0.75
Vas (Cuft) ->0.4
SPL ->96db

Will be driven by chipamp 3875 with LEF output direct from DVD player.

Thanks in advance...
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Old 17th January 2009, 05:48 PM   #2
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HT requires a considerably lower Fs than 65 Hz, though a relatively large tapped horn (TH) can work down to below 30 Hz if the drivers have enough Xmax. Even then you'll need a high pass to protect it since some movies have significant output down into the teens, so I guess using WinISD or similar to find a sealed alignment is about your only 'small' option and make it as tall as the driver's size allows to minimize its footprint and accept the mid-bass F3, Fb (excluding any room/whatever help).

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Old 18th January 2009, 07:52 PM   #3
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Thanks GM,

May be I should just stick them in a smaller H-frame similar to these 12" ..


My H-Frame OB


This new project with the 10" woofers is to top up the HT subwoofer set up currently using a D-BOX david-300 daisy chain to a Polkaudio PSW505 and then daisy chain to Sony SA-W3800 in a 4.1 setup in a 900 sq ft open unfurnished basement.

They are not suited for the SONO tubes aren't they?
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Old 19th January 2009, 01:58 AM   #4
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By 'sonotubes' I assume you're referring to the cardboard tube subs popularized by Hsu Research and all the rage with DIYers 10+ yrs ago. If so, then like any other bass reflex (BR) it's not going to perform any better than a floor loaded rectangular one.

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Old 20th January 2009, 03:06 PM   #5
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Yes those construction tubes from Home Depot..
They will have much smaller foot print than the floor loaded rectangular ones I think? What about the smaller H-frames?
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Old 21st January 2009, 07:17 AM   #6
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Not really, unless you consider squaring a given diameter a big difference. What about 'H' frames? This is a sub thread, so with a 65 Hz Fs and still no idea what Xmax is, an 'H' frame may only be good for >100 Hz duty.

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Old 21st January 2009, 03:45 PM   #7
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I am sorry GM. I wasn't clear enough about footprint. I meant square footage occupied on the ground. By using a Tube the volume occupied will be vertical. I can put these columns by the sides of the screen. It their diameter is small enough they can be hidden behind the 103" diameter diy screen. May be a flat rectangular pancake folded/tapered horn can hide behind the screen as well.

And no I do not know the Xmas. It is no where to be found in the package.
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Old 21st January 2009, 04:52 PM   #8
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You have a round screen?! Or did you mean diagonal or width?

Anyway, square, round or rectangular, one dimension will be limited by the driver's frame diameter or side if it's a square frame, so this is its minimum depth if up, down or side firing and if front or rear firing its minimum depth is obviously based on the driver's total depth plus a gap for a rear vent to 'breathe' if it has one and another gap to the screen if not above or below it. Once this is determined, then height is only limited by ceiling height minus the gap required to tilt it in place and finally, width can't exceed screen width. This makes for a huge Vb capability with even a small driver. I mean two DSL 'couch' TH subs will fit behind a large screen and is only 11" deep if stood on its side: Double Driver Tapped Horn

What brand/model driver is this?

GM
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Old 21st January 2009, 06:13 PM   #9
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My bad, the 103 diagonal projection screen was made by my wife for me out of black out cloth including wooden frame cost less than 100 cdn dollar. It is free hanging 5 inches from the floor joist on the ceiling, about 3 feet off the foundation ground and one foot away from the wall which is hiding the studs and vapor barrier of the unfinished basement.

The speakers are Pyramid WH1038 10inch.
I have 3 at hand altogether but was thinking only needed 2 for the HT sub supplement idea.
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Old 21st January 2009, 08:35 PM   #10
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Hi,

FYI, T/S data from a Swedish Retailer BRL Electronics (no more in business): see picture 1(1)

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