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-   -   Tang Band W8-1772 Impressions. (https://www.diyaudio.com/forums/full-range/150267-tang-band-w8-1772-impressions.html)

norman bates 25th February 2015 12:22 AM

now that would be a nice sounding hometheater !!!!!!!!!

gomper 25th February 2015 01:15 AM

That's interesting, Dave - they are indeed a BR design. I used the parameters Bob posted at the start of the thread, and plugged them in to the formulas in this short pdf on the topic of bass reflex design:

http://www.electroziq.org/docs/Desig...Enclosures.pdf

What would the actual tuning be?

And, thanks very much for the kind words, guys.

planet10 25th February 2015 02:09 AM

Quote:

Originally Posted by gomper (https://www.diyaudio.com/forums/full-range/150267-tang-band-w8-1772-impressions-post4236756.html#post4236756)
What would the actual tuning be?

I leave ML-TL design to those with MJK software but IIRC your box will be tuned lower than you think.

dave

Scottmoose 25th February 2015 10:37 AM

Depends on the internal damping. From a quick eyeball at the photographs, it's not as extreme in dimensions as some, so might be tuned a few Hz lower than expected, & probably have a little more gain -I suspect the impact will be more on alignment than Fb per se.

kip.duff 7th October 2015 11:30 PM

What about Tang Band's own enclosure design for the 8W-1772? I found this on PartsExpress site- while looking at the 1772 page, I noticed that there was a link for "8W-1772 Horn Loaded Speaker Design" in same area as specification and warranty links. Here's the link.

http://www.parts-express.com/pedocs/...0news_rev2.pdf

I'm pretty sure I'm gonna do an 8W-1772 speaker project. I'm thinking of building TB's above mentioned enclosure- or JimOfOakCreek's 40 litre box build from this site (thanks Jim!).

I haven't looked at this entire thread yet, but in many searches of examples of 8W-1772 build projects, the TB HL design was not found- just stumbled on it today.

Tang Band's build sure looks heavy- 1" "HDF" (Masonite? 1"? didn't think there was such a thing). Will probably use 1" MDF. Exterior dimensions: 44" h, 12"w, and 22" d. It looks very much like a bigger version of Tang Band's D4-1 complete kit (which I had been considering @ $640, delivered).

This will be run with Bottlehead Paramount 300B SET's, 8w. That's kinda why I didn't get the D4-1's- 89db SPL vs 95db for the 1772's (that's the spec on PartsExpress site). Am also considering the Altec 604 8H, K, or GPA's in a 612 box.

I'm not anticipating trying to do much design work on this project- I know enough to leave that to those who know more than me. I'm trying to benefit from designs and builds that have already been worked out- and base my build on them.

Anyone got 1) opinions on TB's HL design 2) tips on MDF box building techniques 3) any other advice?

Thanks, Kip.............

planet10 8th October 2015 12:15 AM

Quote:

TB's HL design 2) tips on MDF box building techniques
It is highly recommended that you use good plywood for these kinds of Nagaoka-style BLH, not MDF.

The W8-1772 i had measured 92 dB. 300B should be sufficient power.

dave

kip.duff 8th October 2015 01:02 AM

Quote:

Originally Posted by planet10 (https://www.diyaudio.com/forums/full-range/150267-tang-band-w8-1772-impressions-post4476211.html#post4476211)
It is highly recommended that you use good plywood for these kinds of Nagaoka-style BLH, not MDF.

dave

I think your'e right- MDF: glorified cardboard. 1" birch veneer is probably available. I'm gonna start looking (Ganahl did'nt have it). Also: Baltic Birch 1"- if available, probably $$$$$. Maybe I have to convert to 3/4" material: too thin?

"Nagaoka-style BLH"- gonna check into that.

chrisb 8th October 2015 02:01 AM

kipp - the BLH plan that you linked to looks very much like the Nagaoka family of horns that Dave referenced. Having built a couple of similar designs for Fostex FE166 and FE206 in the past, my first comment would be - possibly more labour involved in the build than the 1772 needs to work well.

Masonite is yet another of those building material brand names colloquially used as a generic product category name, such as Medite, ApplePly, Formica, Corian, etc. In the local area of our trade (commercial millwork), Masonite is generally used to describe thin (1/8" or 1/45" max) tempered hardboard.

To get anally pedantic about it: "Hardboard is produced in either a wet or dry process. The wet process, known as the Mason Method,leaves only one smooth side while the dry processed hardboard is smooth on both sides. Masonite is produced using the wet process only.

HDF can have a density of between 50-60lbs per cubic foot (1728"^3) , a 4x8' sheet of 1" thick material is 48x96x1= 4608 in^3,(2 2/3 cu ft) so yeah, an enclosure requiring a couple of sheets will quickly become an awkward and dangerous weight amount of material to try and manipulate.

I also happen to believe that a decent high ply count plywood - generically Baltic Birch, Apple, Russian, etc plywood sounds better than MDF. Yes, it costs more, and with the amount of bracing from the multiple lateral panels in a Nagaoka / Olson style horn / labyrinth, 18mm Baltic birch is not too thin.

kip.duff 8th October 2015 02:42 AM

Quote:

Originally Posted by chrisb (https://www.diyaudio.com/forums/full-range/150267-tang-band-w8-1772-impressions-post4476272.html#post4476272)
kipp - the BLH plan that you linked to looks very much like the Nagaoka family of horns that Dave referenced. Having built a couple of similar designs for Fostex FE166 and FE206 in the past, my first comment would be - possibly more labour involved in the build than the 1772 needs to work well.

Masonite is yet another of those building material brand names colloquially used as a generic product category name, such as Medite, ApplePly, Formica, Corian, etc. In the local area of our trade (commercial millwork), Masonite is generally used to describe thin (1/8" or 1/45" max) tempered hardboard.

To get anally pedantic about it: "Hardboard is produced in either a wet or dry process. The wet process, known as the Mason Method,leaves only one smooth side while the dry processed hardboard is smooth on both sides. Masonite is produced using the wet process only.

HDF can have a density of between 50-60lbs per cubic foot (1728"^3) , a 4x8' sheet of 1" thick material is 48x96x1= 4608 in^3,(2 2/3 cu ft) so yeah, an enclosure requiring a couple of sheets will quickly become an awkward and dangerous weight amount of material to try and manipulate.

I also happen to believe that a decent high ply count plywood - generically Baltic Birch, Apple, Russian, etc plywood sounds better than MDF. Yes, it costs more, and with the amount of bracing from the multiple lateral panels in a Nagaoka / Olson style horn / labyrinth, 18mm Baltic birch is not too thin.


chrisb:

HDF/MDF is out- don't know what they're thinking (or me for that matter).

So: some sort of 1" ply would be nice, but sofar all I find is shop grade ACX (not the end of the world). So you think 3/4" is OK- I will have to carefully alter the plans. AND the Baltic Birch sure looks nice.

OR use the 1" ACX- I could cover the front and rear with some sort of 1/4" pretty ply or veneer to hide the joints if I feel like making it look nicer. On the front if I cut out the max OD of the driver on the 1/4 front cover material- then the driver front frame face will be flush with the cabinet's front surface (6.0mm driver frame outer edge thickness is just a hair under 1/4"). Still- gotta wonder about the weight with 1" build- like you say; may be overkill.

I didn't know about these other multi-ply plywoods (apple, Russian)- will check.

Was at Newport Beach City Hall last week for the first time. They had recently built it and moved in. EVERY desk unit including shelving in front/above in the entire building is Baltic birch, including vertical supports (almost everywhere 2 X 1" Baltic birch sandwiched for 2" total thick). Many large free-standing tables (seemed wider than 8') with 2" thick sandwiched Baltic birch construction. All with semi-gloss clear laquer. EXTREMELY simple construction- when viewed from the back, simple cross section shaped like a staple. Felt solid like concrete. I may try to try to contact the contractors who built it to see about remnants.

planet10 8th October 2015 02:43 AM

Quote:

Originally Posted by chrisb (https://www.diyaudio.com/forums/full-range/150267-tang-band-w8-1772-impressions-post4476272.html#post4476272)
18mm Baltic birch is not too thin.

With some care in the bracing of the mouth & back, 15mm is probably fine.

dave


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