Nonprofit project - Poor man's hi-eff horn speaker

[moray james]

Dave makes a very good point and at the very least finding a woofer that can cross higher is a good plan as it provides you with the ability to build a wider range of speaker systems such as very loud but cheap systems where you want the woofer to take on the heavy work to insure your compression driver will last. I think that quality here in all your projects is well worth the extra cost as it insures your designs last and they don't often require service. It was upon such quality that Tannoy, JBL and Altec built their reputations. Do it right do it once. Best regards Moray James.

[karlson3]

regarding the Karlson tube waveguide, a good start is to make one the size of Transylvania Power Company's "The Tube" - 1 inch diameter, ~5.3" long, a 0.125" starting gap at its throat and a half-ellipse pattern  - they are normally tilted up or down from horizontal as theres a mix of two directivites  - - I'm not sure what Faerber accomplishes with a long tube other than the ability to keep time and have the tube protrude through a round midhorn's wall.   It would take a few tubes and measuring to find out.   Paper could be used a proof of concept.

 

a wider baffle at the compression driver could offset some loss on the low end due to small dimensions invovled

 

[grindstone]

Heya Freddy! Cool to see you here-abouts. Didja lose the first 2 K 'nyms here in the last few decades?

: )

Carry-on : )

[djk]

Nice looking K-12 Fred.

 

For a 100hz cross for PA, would I be better off trying to build a 12" Rocket or a K-12 do you think?

[Arash]

another issue itching mind mind is that non-Ti CDs sound smoother to my ear so I tend more toward polymers diaphragms. 

 

HF140 (Titanium) response:

 

HF 144 (Ketone polymer):

 

HF 146 (Ketone polymer):

 

the low end of all three drivers look like the same. HF144 seems more linear. HF140 have a little bit better top end but there is also a deep/hump around 15Khz. I don't see a point why wouldn't I use HF144 over HF140. any idea?

 

 

 

I really need comments about HF140 vs. HF144/HF146 as I'm about to finalize the list of my order.

[moray james]

the response of the 146 would at the least have me interested enough to want to hear a pair.

[djk]

I have the 140 and 146 (and some of the smaller HF)

 

I chose the 146 because it is smoother in the 1.5Khz region.

 

The 140 is OK for PA, it adds a bit of 'tizz' on top for systems lacking in definition.

[Arash]

has anybody here any experience with Beyma 15XA38ND 15" coax? it seems interesting and there are some good comments of people preferring it over Tannoy concentric driver.

[Zoef]

^Arash,

 

^{I just read this.}

 

^{I was looking into a project using this driver. (on other forum) I got following reply from a user:}

 

 

 

 

 

 

<sup>Check out these designs:

Caveman 15 - TQWT with 15XA38Nd

Sweden's No Frills Audio Introduces The Caveman Loudspeaker | Ultra High-End Audio and Home Theater Review

Wizard High-End Audio Blog: No-Frills-Audio Caveman 15

www.audioexcite.com Sweetspot Stockholm 2013

Inner Magazine - Stockholm Highend Mässä 2013 - Part III

Monitor 38 - 125L with xo 1200Hz (the highest I'd go!)

Monitor 38 (download the prospect for cabinet drawings)

Beyma XA38 von Oliver P.

Blog with various simulations (BR, sealed, LWT etc)

DIY Audio Blog: August 2013</sup>

[ClaudeJ1]

on-Ti CDs sound smoother to my ear so I tend more toward polymers diaphragms.

I agree with this notion also. 

[Zoef]

Hate to reply on a old topic,

 

Like you stated in point 2 about the 15pr400: could be used down to f3 38hz in a ~190l ported cabinet. this speaker sure reminisces Bob's Style D Cornscala.

I want to try something like this.

 

Arash, would you happen to have a cabinet design like you stated that i can use ?

Or anyone else?