HiVi 10.8 - ideas ?

britbug · 10th April 2007, 05:45 PM

Hi, came across a hiVi10.8 woofer cheap, was thinking of either a simple sealed, or a crazy Pass-like El Pipe-O.
Anybody had success with this driver in subs?
Thanks

GM · 10th April 2007, 10:03 PM

Greets!

A MLTL variant tuned to 18 Hz appears viable:

L = 74.75"

CSA = 165.8"^2 - recommend 16.375" x 10.125"

zdriver = anywhere from the end to 26.687" away

zport = 4" dia. x 10" long near/at the other end

minimal stuffing or lining

GM

britbug · 11th April 2007, 03:18 PM

Cheers,
How vital is that cross section area?
12 Inch diameter sonotube would fit most requirements, but a bit low on CSA - only ~ 113 in^2.

GM · 11th April 2007, 04:38 PM

Greets!

All else being equal it will begin rolling off at ~30 Hz to a ~22 Hz Fb and have more 'ripple' above ~100 Hz, but that's not an issue with a sub. Vent mach will be higher, so may require some damping if any synth/movie special effects have significant output near/at Fb. Of course these are idealized half space alignments, so the room and where the sub's located in it will alter them to a greater or lesser extent.

FWIW, the pipe needs to be ~109.4" long to reclaim the lost Vb, though it now has enough pipe action to damp the entire gain BW ~1 dB pushing the vent's harmonics down into the sub's upper passband, creating a ~3 dB broadband dip in the response above ~60 Hz.

Bottom line, if you don't have a tall ceiling like NP, then to get the most gain BW out of this driver in a cardboard tube will require stepping up to an 18" one since I don't believe there are any intermediate sizes.

GM

britbug · 11th April 2007, 05:16 PM

OK, I do have a 14 ft ceiling in listening room, but will take the advice.
Thanks!
Graham

10th April 2007, 05:45 PM	#1
britbug diyAudio Member Join Date: Nov 2005	HiVi 10.8 - ideas ? Hi, came across a hiVi10.8 woofer cheap, was thinking of either a simple sealed, or a crazy Pass-like El Pipe-O. Anybody had success with this driver in subs? Thanks

11th April 2007, 04:38 PM	#4
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	Re: HiVi 10.8 - ideas ? Greets! All else being equal it will begin rolling off at ~30 Hz to a ~22 Hz Fb and have more 'ripple' above ~100 Hz, but that's not an issue with a sub. Vent mach will be higher, so may require some damping if any synth/movie special effects have significant output near/at Fb. Of course these are idealized half space alignments, so the room and where the sub's located in it will alter them to a greater or lesser extent. FWIW, the pipe needs to be ~109.4" long to reclaim the lost Vb, though it now has enough pipe action to damp the entire gain BW ~1 dB pushing the vent's harmonics down into the sub's upper passband, creating a ~3 dB broadband dip in the response above ~60 Hz. Bottom line, if you don't have a tall ceiling like NP, then to get the most gain BW out of this driver in a cardboard tube will require stepping up to an 18" one since I don't believe there are any intermediate sizes. GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

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11th April 2007, 03:18 PM	#3
britbug diyAudio Member Join Date: Nov 2005	Cheers, How vital is that cross section area? 12 Inch diameter sonotube would fit most requirements, but a bit low on CSA - only ~ 113 in^2.

11th April 2007, 05:16 PM	#5
britbug diyAudio Member Join Date: Nov 2005	OK, I do have a 14 ft ceiling in listening room, but will take the advice. Thanks! Graham

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