Best JX92S Project

[britbug]

Hi All, has anyone made multiple enclosures/baffles for JX92s.
If so, which have you found best? Really only looking for single driver approach.
Thanks

[Colin]

I've built the Jordan VTL and GM's 48" MLTL in triangular format. Of the two, the MLTL goes deepest but needed some BSC, which reduces its efficiency somewhat (so you need twice the power from the amplifier). With BSC, my preference was for the MLTL.

I'm currently finishing the 31" MLTL, hoping for (almost as) good bass but without the need for BSC. LF I can add with a sub if required.

These are all on the EAD site under 'Systems':

Namnlst dokument

[graaf]

thinkbad's IKEA stainless bowl looks like a great little idea:
Loudspeakers and room as a system

[mdikovics]

I have to say that I frequently see similar thoughts on BSC...

My view is that typically the R value is less than the speaker impedance, so at worst case less than 3dB power! (3 dB being a required doubling of the amplifier power)

But more importantly, especially for narrow cabinets, most of the level reduction is in the 400+ Hz range, frequently 600-800+. Below that frequency there is essentially no loss in efficiency. The power spectral density (power vs. frequency) in most music is much lower from 1 KHz up than 1 KHz down, so proportionally the amp is driving most of it's power with identical efficiency as an uncorrected system. (No loss from the R) The additional power required to drive the reduced efficiency high end is a small percent of the overall power.

Now it may not "sound" quite as loud as the uncorrected version because the disproportionate high end "sounds" louder, but who cares because it is an incorrect FR. Which is what you were trying to correct.

So, net net, gaining correct tonal balance has small to negligible impact to your amplifier requirements, certainly no where near 3dB power.

On wider baffles, this analysis would be less true, but the R value in the BSC will tend to decrease, as room/wall coupling will require less BSC dBs. So again, no where near 3dB!

People thinking of applying a BSC to provide proper tonal balance should not worry about increased power requirements! If you consider that good amplifiers have good transient capabilities in the voltage department this is even less important. SET folks generally excluded from this analysis...

Mark