Replacing ALL of the caps was done to match the switch positions and shift everything.Originally Posted by Zilch
A 0.1 uF across C10 is fine and the dips will be 0100.
Replacing ALL of the caps was done to match the switch positions and shift everything.
A 0.1 uF across C10 is fine and the dips will be 0100.
Found 0.11 uf metalized polypropylene cap, 63 Volt, for 45¢ (10) at Digikey (page 5, here: http://dkc3.digikey.com/PDF/T051/0946-0952.pdf) #BC2055-ND. Ordered.
Potentially also an easy mod of JBL 5235 for use as subwoofer crossover with 26 Hz Q=2 (6 dB) bump for B380/B460 per BX63(A). Choose filter card components from list provided in 5235 manual here: http://www.jblproservice.com/pdf/Vin...5%20manual.pdf. JBL standard sub card for 5235 is 80 Hz, 18 dB.
Again, DON'T use this mod if you're biamping stock 4430's with 5235. The standard box tuning is wrong for this, (too high) and you'll risk damage to your woofers.
Not until we develop a considered scheme for retuning them, at least....
Block one of the stock 4430 ports and it will be fine. That drops the tuning down to around 25 - 26 Hz.
Heh, heh. Requisite consideration provided.
[Off to the plumbing store again for more proprietary port blocking devices, then....]
With assistance of rat-tail file, diminutive 3" diaphragm 2431H neodymium-magnet drivers fit onto 1-1/2" P-Audio horns. They sound brighter to me than LE85, 2426 or 2427. RTA says it's not because of any HF extension, rather, a little less SPL around 1 kHz, the crossover frequency. The assembly is shorter than any other so far, so it may just be the same phasing issue encountered above.
Are they cleaner or smoother than the other drivers as alleged? Could YOU tell playin' Pink Floyd? Wish we had some specs on these things.
[I think they ARE, actually....]
Horn gasket on face of drivers looks like Silpad, a thermally conductive silicone pad material, commonly used to couple power transistors to heat sinks, which would conduct heat to aluminum horns, if used. Very clever, if so....
Up from the dungeon, near-mint pair of L200 cabs beg for reincarnation as 4430's. Hold on just a little bit longer, nice cabs. It LOOKS like we're gettin' there.
[Giskard already sent you some lovely new woofers....]
Again, we need those HORNS, JBL!
You are not really going to put butt cheeks into those beautiful cabinets!
Widget
Heh, heh, they'll JUST fit....
AND they'll hide behind the grilles.
Word is YOU have a pair of L200's what could use some rework, too, Mr. Widget!
[Don't anybody start cuttin' into their L200's, now! Mr. Widget is NOT done yet....]
No I don't, but I'd buy yours if it would stop you from sticking those foul things out the front of those beautiful walnut cabinets. I thought you had some junkers that were being salvaged from Urban Ore.
Widget
I'll sell you the LX-16 crossovers REAL cheap, but folks have taken a liking to LE15B's on eBay of late.
[Can't imagine why, tho....]
Now why would I want a pair of LX16s?
I just think that trashing a near mint L200 is like adding a wing to the back of a '65 Mustang.
Widget
They've always been crap. JBL tried to fix 'em and failed. The only rational solution is to make them into ... [I can hardly type the words, now, ... ack ... ACK, I'm gaggin' here ...] THREE-WAYS!
[We gonna do WAY better'n that....
None of my business but my preferred alternative would be a 2123H in matching timber sub enclosure sitting atop the exisiting cabinet. Hence a 4 way thay will wipe the floor with those bum horns.
Ian
Widget
BWAHAHAHAH!
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