Costs of bringing 4343 drivers to factory spec

[John Nebel]

Well, it's not cheap!

These are the prices JBL recently charged for recone or new diaphragms and remagnetization.


2 x 2405 $314
2 x 2420 $601 (new dampener pad - 2421 diaphragm)
2 x 2121 $517
2 x 2231A $365 (2235 cone kit)
Shipping $180 (to JBL, depends on distance)

$1977 total

An alternative is to replace the 2231A's with 2235H's and to pad the woofer down by 1dB to match the different sensitivity. Ian reminded me about this. The 2235H's at $382/pair street price are essentially the same cost as 2231A recones and remags and raises the power capacity. The specs for 2231A are 100w and 2235H 300w - don't know what the specs for the hybrid would be.

John

PS - see subsequent commentary on "padding"

[4313B]

"An alternative is to replace the 2231A's with 2235H's and to pad the woofer down by 1dB to match the different sensitivity."

No, the woofers don't need to be padded down. There is plenty of slop in the L-Pads. Besides, the 2231A has a sensitivity of 93.36 dB W m and the 2235H has a sensitivity of 93.16 dB W m.

"The specs for 2231A are 100w and 2235H 300w - don't know what the specs for the hybrid would be."

Roughly 200 W for a "2235A" due to the improved materials in the 2235 coil assembly.

[John Nebel]

Originally posted by Giskard
No, the woofers don't need to be padded down. There is plenty of slop in the L-Pads. Besides, the 2231A has a sensitivity of 93.36 dB W m and the 2235H has a sensitivity of 93.16 dB W m.


Right, I meant padding by either adjusting the L-pads in the passive crossover or potentiometers in the active crossover.

As for sensitivity, I guess it depends on what set of specs one looks at - I remembered the figure and read it somewhere and can't find it now.

John

[4313B]

"As for sensitivity, I guess it depends on what set of specs one looks at - I remembered the figure and read it somewhere and can't find it now."

Definitely and JBL has spec'd the 2231 at 93 dB and 94 dB. But you can only get so much sensitivity from a given moving mass and a given motor and that's where the sensitivity figures above come from. The 2245H is 95.2 dB W m with respect to the above values. This difference is easily within range of the L-Pads on the 4344 and 4345. Anyway, just nitpicking, I read "pad the woofer" and freaked out. :p