JBL 2245H 18" Bass unit in a "Transmission line" enclosure

[darkmatter]

Question regarding use of a JBL 2245H 18" Bass unit in a "Transmission line" enclosure?

This would make for a very large cabinet which would not be an issue for me, but I would be very interested to learn if anyone has built one based on the JBL 2245H 18" Bass unit or a big TL using a similar 18" driver.

PMC use the 15" Volt (RV3363) in the large BB5 system, which has an fs of around 29Hz. The line length is effectively 4m or 13' according to PMC the actual physical length is a bit shorter at just under 3m. Using 1/4 wave criteria works out at approx 2.9m, so close.

I did consider the bigger Volt RV4564 which has a resonance of approx 26Hz which would offer greater performance than the BB5. Based on the BB5 specs 1/4 wave comes out at 3.3m (PMC effective length = 4.6m)

Anyway I am interested to learn if anyone has used the 2245H? I will model with it as a matter of interest.

I happen to have a pair of 2245H drivers doing very little, so propose a stereo pair of enclosures.

[grumpy]

I know this is a year old, but if the OP finds this.. it still might be useful or at least interesting:

http://www.audioheritage.org/vbulletin/showthread.php?12126-DIY-Axially-symmetric-oblate-spheroid-CD-waveguides-in-solid-Oak&highlight=3182
(jump down to post #7)

[rusty jefferson]

I know this is a year old, but if the OP finds this.. it still might be useful or at least interesting:

http://www.audioheritage.org/vbulletin/showthread.php?12126-DIY-Axially-symmetric-oblate-spheroid-CD-waveguides-in-solid-Oak&highlight=3182
(jump down to post #7)
That is a thread I'd not seen before. Thanks for the link. I would very much like a demonstration of his efforts.

[darkmatter]

I know this is a year old, but if the OP finds this.. it still might be useful or at least interesting:

http://www.audioheritage.org/vbulletin/showthread.php?12126-DIY-Axially-symmetric-oblate-spheroid-CD-waveguides-in-solid-Oak&highlight=3182
(jump down to post #7)

Much appreciated will invigate further

Simon