Naim "separate box" speaker design

Hi Peter,

I think Canadian manufacturers Verity Audio use something similar -- you can turn around one section of the speaker to have either a forward firing or a backward firing mid/bass cabinet.

Thomas

quote:

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Originally posted by Surfing Alien:
Hi all!

Is there anyone who knows if the "separate box" technique used by Naim to build their speakers is (or has been) used by other manufacturers? Somehow it looks familiar, but I can't remember where I saw it before.

I'm very interrested in how this works, but information is quite hard to find.

Regards,
Peter

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Check out the Kef site. Probably their first separate box design was the 105 in the 1970s.
Terry

Spica's Angeles is a seperate box design. It's an old design, but I'm not sure if it predates the SBL.

Judd

It is recognised to be used for the first time by Dynaco in the 1960:s. They where made in Denmark and that part of Dynaco is today known as Dynaudio! I think I have seen it in a cutaway drawing of a French speaker also, ca. 1980 (not sure here).

It is sounding excelent, anyway!

JohanR

Hi

Thanx for the input guys. I've been digging into speaker design for some time now, and I'm planning to do some building myself.

I like the way Naim speakers handle bass, but I'n not too fond of the tweeter used in the Intro / Credo. Personally I'm totally hooked on the Scan Speak Revelator used in my own speakers. The Revelator could be outperformed by Scan Speak's new ring radiator, but I've never heard it, and it costs some € 500.

James: I've looked up the North Creek's site: very interresting! Only I can't figure out the differences in Thiele Small parameters given in their design using the 15S-8530K Revelator mid bass driver. Qtc is way of scale compared to what Scan Speak's claims. Also, another part of their site mentions quite different TS paraeters for that unit.

Regards,
Peter

[This message was edited by Surfing Alien on THURSDAY 06 March 2003 at 16:30.]

Hi James,

I think you're right about smaller tweeters not being suited for 2-way usage. Problem is that some / most 1" tweeters have problems reaching 20K hz. The Revelator does not have this problem, and it's very fast too! My first choice for 2-way.

The mid-woofer used in the Noth Creeek design is a shielded version of the W15W/8530K - don't know why it's not on D-S-T, but SS is sometimes late updating their site. The Qts (you're right again) should be in the line of 0.4 or less, but also other T/S parameters are not in line.

My info on Scan Speak units is that they are "more or less" broken in (for about 24 hours or so); this is far better than nost other do, but imho units need more time to be really broken in.

I've been building speakers before, but never made any "finished products", except for a cinema-sub whitch is allmost ready. Again you're right about starting off with sealed enclosures, but this type of speaker leave little room for experimenting.

I'm more interrested in building speakers by trail-and-error and carefull listening; I do have some measuring equipement, but for the real work a accoustically "dead" room is needed whitch I don't have :-) For me it's just a hobby, so don't expect the world from it. I must say some interresting designs saw the light of day this way, so maybe I'll come up with something one day :-)

BTW, do you build your own speakers?

Regards,
Peter