Hi, Would anyone have a set of factory 5235 crossover cards for my 4430's thanks Jeff
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Hi, Would anyone have a set of factory 5235 crossover cards for my 4430's thanks Jeff
It would be easier to purchase and 18 db card and just change the values.
Rob :)
do you know who can do this ?
If you can lay your hands on the cards and have the required component values anyone who does electronic repairs can handle the task. If you can't find the cards you might look for a BSS FDS360 crossover. Those can be set up for 3rd order filters and there was a much larger universe of those compared to the JBL made crossovers. The BSS were nicer units all in all.Quote:
Originally Posted by Jeffd
Ask Restaur’Audio they have such 18dB compatible boards. https://www.restauraudio.fr/accessoi...51-5145.htmlIt is a card for 4345 but the PCB is the same, and I’m pretty sure they can make a set of cards for 4430 for you.
Interesting that the bi-amp cards for the 4430 are 3rd order as the passive networks are 2nd order.Quote:
Originally Posted by Robh3606
Actually the passive is a little more elaborate, with a mix of acoustical and electrical roll-offs.
Without pic/graphs shown it would be too long to describe that contents. The yellow highlight section represents the CD horn power response EQ. I posted a similar one previously in my BGW thread but it was a little different like providing the values to make such filter.
The pic with graphs here is clear enough for increased size viewing, i tested it. NOTE: IT WILL BE DELETED SOON (from John Eargle, Loudspeaker Handbook, 2nd ed, P. 116-117).
Please don't repost elsewhere the pics attached. Thank you.
Richard
Thanks for those details about the 4430 design. I was noting that the portions of the passive network that are bypassed when switching to bi-amp operation are 2nd order filters. If the active crossover cards are set up for 3rd order that's going to result in different phase angles at crossover and resulting summation at crossover. I'd be curious to see measurement comparisons between passive and active operation showing the results of these two rather different topologies.Quote:
Originally Posted by RMC
Sorry but the second pic of my last post had to go, as announced previously.