New BLH for 8" drivers "The Blizzard"

Harderror · 26th July 2011, 04:02 PM

You know, I was going through my designs and with the 8" full range driver being so common these days I thought I would mention a design I did last winter that should work equally well for the AN, Lowther, Tang Band, Dayton etc. etc. Low Qts drivers. The reason I never finished it and put it up for whoever wants it is my roof broke under the weight of the snow we had here in the District of Columbia. I was so busy dealing with that that I forgot about this design. Not only that but the last year has been a busy one with my house and with the 2 way 3 way and line array projects I have been working on. That said here's the pitch:

The Blizzard
More compact than any long path 8" BLH that I have designed as of yet. It should have an F3 of around 40 Hz and an F6 of around 36Hz. The design overall looks pretty promising. Have a look at the projected in room simulation. Dimension are around 11x25x56 inches. The build should be easy as there are zero mitered joints in this one (I know amazing coming from me!)

I haven't done a cut sheet, or a plan packet yet but that can be arranged if there is any interest. FWIW I figured I would ask after this since I always love to get plans for my ideas out there.

Plot1 shows the projected in room response simulation and plot2 shows the simmed combined system response. Overall pretty nice looking.

Tom

planet10 · 26th July 2011, 05:55 PM

Hi Tom,

What driver is the sim with?

dave

Harderror · 26th July 2011, 06:16 PM

Sorry Dave, the driver in the sim is the Tang Band W8-1772. I am about to sim it with the new Dayton and see what that turns back.

Tom

Harderror · 26th July 2011, 06:38 PM

Okay, here are the projected system graph and the projected in room system graph respectively for the Dayton PS220-8. Looks promising! Almost looks like the extension will be a little lower than the Tang Band but I don't know how either sounds as I haven't been able to audition either.

Tom

planet10 · 26th July 2011, 08:43 PM

Quote:

Originally Posted by Harderror

Tang Band W8-1772

That driver, when introduced, was a bit costy given the performance, with a near doubling of price, its cost/performance is now way out of touch.

The Dayton has only gone up $10 each, so is still in the running.

dave

Harderror · 09:50 PM

Yeah, I remember that being an expensive unit. I had no idea that they were at 321 a piece now. There is no way I would support Tang Band at this point. All of their prices have gone through the roof. Good news is I designed the horn to work with pretty much any of the 8" low Q drivers out there. I am very interested in this Dayton of course. The list of drivers that I feel are competitive that can be dropped in to this horn are of course the ANS8, Cast ANS8, Dayton PS220-8, Decware DFR-8, and on another level the Sonodyne' Lowther, etc. As long as it's 8 inches with a qts of say between .15-.3 they should be a good match. Does this sound like a reasonable range Dave?

As an afterthought, I forgot to mention all the low Qts Fostex drivers. Sorry guys, I just don't do their stuff anymore. I lost the "taste" for their sound. All apologies!

Tom

Harderror · 26th July 2011, 10:15 PM

Sorry to keep posting guys but I realized that I had posted a sim based on the published T/S parameters for the Dayton and not the measured. Following are the measured sims. First is the combined sim of projected FR and the second is the combined sim of in room projected FR. Once again, sorry guys.

Tom

I hate switching system as well. I am a Mac user that keeps PCs around for just this sort of stuff. Why won't the Mathcad folks support Mac? Ah well...

blakkshepeaudio · 27th July 2011, 04:34 AM

Very interested in this design: very much looking forward to further info.

Rgds,
blakkshepeaudio

planet10 · 27th July 2011, 06:51 AM

Quote:

Originally Posted by Harderror

... Decware DFR-8...I forgot to mention all the low Qts Fostex drivers. Sorry guys, I just don't do their stuff anymore. I lost the "taste" for their sound.

The Decware retains most of the character of the FE206 it is based on.

dave

Rev. Billy Bob · 27th July 2011, 12:14 PM

That looks like a really cool design, and one that could be built without a lot of tools. I’ve always wanted to try the Fostex FW208N in a blh. The specs look great to me.

fs 29 Hz

Qms 13.2

Qes 0.21

Qts 0.20

Mms 40 g

Cms - mm/N

Sd - cm2

BL - N/A

Vas 43.4 ltrs

Xmax 6.5 mm peak

Is there any way you could sim it? Thank you.

26th July 2011, 05:55 PM	#2
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	Hi Tom, What driver is the sim with? dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

26th July 2011, 09:47 PM	#6
Harderror diyAudio Member Join Date: Mar 2006 Location: Washington DC	Yeah, I remember that being an expensive unit. I had no idea that they were at 321 a piece now. There is no way I would support Tang Band at this point. All of their prices have gone through the roof. Good news is I designed the horn to work with pretty much any of the 8" low Q drivers out there. I am very interested in this Dayton of course. The list of drivers that I feel are competitive that can be dropped in to this horn are of course the ANS8, Cast ANS8, Dayton PS220-8, Decware DFR-8, and on another level the Sonodyne' Lowther, etc. As long as it's 8 inches with a qts of say between .15-.3 they should be a good match. Does this sound like a reasonable range Dave? As an afterthought, I forgot to mention all the low Qts Fostex drivers. Sorry guys, I just don't do their stuff anymore. I lost the "taste" for their sound. All apologies! Tom Last edited by Harderror; 26th July 2011 at 09:50 PM.

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26th July 2011, 06:16 PM	#3
Harderror diyAudio Member Join Date: Mar 2006 Location: Washington DC	Sorry Dave, the driver in the sim is the Tang Band W8-1772. I am about to sim it with the new Dayton and see what that turns back. Tom

27th July 2011, 04:34 AM	#8
blakkshepeaudio diyAudio Member Join Date: Sep 2010 Location: Country Victoria Australia	Very interested in this design: very much looking forward to further info. Rgds, blakkshepeaudio

27th July 2011, 12:14 PM	#10
Rev. Billy Bob diyAudio Member Join Date: Jul 2009	That looks like a really cool design, and one that could be built without a lot of tools. I’ve always wanted to try the Fostex FW208N in a blh. The specs look great to me. fs 29 Hz Qms 13.2 Qes 0.21 Qts 0.20 Mms 40 g Cms - mm/N Sd - cm2 BL - N/A Vas 43.4 ltrs Xmax 6.5 mm peak Is there any way you could sim it? Thank you.

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