Don who?Originally Posted by Ian Mackenzie
Widget
Don who?
Widget
I think he's buried in a snow drift somewhere in the wilds of Winterpeg, Manitoba...
No Widget, notDon Quixote.
Some pictures of the crossover
Ian: Here's a few pics of one of the 3141 x-overs. It looks pretty bare compared to some of the other 31xx series. Note the serial number. One of the first few made. If you need other pics let me know.
Rick
Okay,
I have started a revival of the 4341 crossover and done some voltage drives and amplitude response plots of the actual drivers.
I see this as an intuitive and exploratory investigation of why and how JBL did what they did all those years ago.
The curves are ; the 4341 2505 voltage drive, the 4141 2405 amplitude response and the 4345 voltage drive, the 4145 2405 amplitude response.
As you can see they are very different and tomorrow .I will post the horn curves and then the overall response curves.
Ian
Posted below are the voltage drives and ampitude response graphs for the 3145 equivalent and 4141 crossover types, last is a overall mid field reponse, the midrange aspect of the curve should be ignored due to microphone position.
Note these amplitude response and voltage drives where doen with a 2420 fitted with a DR82425 diaphragm. Some variation can be expected if one where to use the 2420 with the DR162420 "original diaphragms.
There are a few things to be aware of. The horn bandpass filtyer is sentivite to impedance fluctuations and this is one reason why they employed a constant impedance attentuation pad. Also, it would seem the 0.16 mh choke as siginificant dcr in order to operated as specificied.
Maybe Giskard can comment on the 0.16 mh choke dcr.
Time for a night cap!
Ian
As promised, some more / better pics. These 4341s are about as original as they come having only had new surrounds on the 2231As and 2121s. The cabs are beautiful and I am very proud of these and will probably keep them forever. Sonically, they could probably be improved by re-coning the 2231s with 2235 kits and possibly replacing the diaphrams in the 2420s but they sound wonderful as is, so what's the point?
More pics, I hope these are appreciated as I realise they use some "space"
Sure they are!! It's a pleasure to see a pair in such nice shape!
Rob
Only a few more!
The last few.
Very nice!
Dope.
There are currently 1 users browsing this thread. (0 members and 1 guests)
Posting Permissions
Reply With Quote
