Waveguides and horns

[Carl_Huff]

Originally Posted by TerribleT

Nice set up you have there. Can you give some specifics on the drivers in the VOT boxes and the crossover? Are you using the original Iwatas that does not have metal reinforment in the driver flange area? I am wondering about long term stability of the horn hanging off the drivers like you have. Do you think they will hold up over time and not develope fractures in the stressed areas?
Thanks,
David

PS I'm still wondering about Altec drivers used in Iwatas. Anybody have any experiences with this combo?

Hello David,

Those are the original IWATAs that did not have the metal reinforcement ring. They were weak. In fact one of mine broke. The waveguide pulled completely free of the MDF mounting ring. When I made the repair I added fiberglass to build up the transition from MDF flange to waveguide. The fix worked and I don't think there is much of a chance that they will come apart again.

The driver in the VOTT box is a GPA 416C. GPA makes a very nice product. Their 416C driver in a stock Altec 828 cabinet is usable (with boost) to 40Hz. The crossover is active and is set at 650Hz / 18dB per octave. I use Dirac Live running in a Datasat RS20i Processor to smooth the response. Bass Management extends the bottom end to 20Hz. I'm very happy with the results.

[jzagaja]

Any preliminary specs for woofer cutout diameter and enclosure volume for the SEOS-10 flat pack? Thanks.

257mm dia, 1cuft. DE250+10CL51. RAW responses enclosed.

[jzagaja]

JMLC-200T solid surface edition, perfect craftsmanship, rollback joint is smooth, gloss deep.

[jzagaja]

Radian 950PB Truextent in JMLC-200T.

[jzagaja]

Compared to 4590.

[phusis]

jzagaja -

(being a non-techie myself..)
How would interprete the differences between the BMS 4590 and Radian 950PB True extent in the measured comparison? The impulse response of the Radian unit seems "cleaner" to me..

[Brett]

Originally Posted by jzagaja

Compared to 4590.

What xover was used for this measurement? Or is it only the MR section of the 4590?

[jzagaja]

4590 - 1uF on HF unit out of phase, no crossover on rest. Hard to tell subjevtive difference as i have only one Radian, BMS has more sparkle. Radian look is awesome and it's light.

[Brett]

Originally Posted by jzagaja

4590 - 1uF on HF unit out of phase, no crossover on rest. Hard to tell subjevtive difference as i have only one Radian, BMS has more sparkle. Radian look is awesome and it's light.

Cheers for that info. Not the way I'd use the 4590 myself: I much preferred a a steep active xover at 6k5. Notwithstanding my preferences, most people would have something more there than what you have, so not too much should be made of the comparison between it and the radian, based on that.

[jzagaja]

Radian has a step at the output of phase plug.