I agree. Poly's don't break down like electrolytics do. If there are electrolytic caps in there, do replace those. The polys are in round cardboard boxes filled with sand and have wires coming out...
Type: Posts; User: old_4312; Keyword(s):
I agree. Poly's don't break down like electrolytics do. If there are electrolytic caps in there, do replace those. The polys are in round cardboard boxes filled with sand and have wires coming out...
Be wary of this aftermarket stuff. I asked for and received a detailed spec sheet on the "LE25 style tweeter" they and others sell---Not even close. As for reviews, many said the LE25 copy was just...
https://www.technicalaudio.com/pdf/Duplex_Speakers_related_to_Altec_604/DUPLEX.html
Scroll down to near the bottom of page
If it's not red or brownish red, it's not the original adhesive/coating.
Might still be a suitable replacement, who knows.
I'm interested in this because after 30+ years of ownership, My 4312's...
There is a edge tear on the LE5 that has been "repaired" and there is small tear in the dust cap allowing dust in the gap.. Considering that someone glued a dust cap on the dust cap of the LE25, I...
If most of the "goop" runs off a woofer's cloth surround, shouldn't it be replaced with something similar?
If so, what?
It seems like that stuff adds damping to the surround-not so much from...
Yes me as well. Cloth surrounds on the 2213's pretty dry......
The goop on my woofers is red....
829198292082921
So, can you use white PVA glue to replace the red JBL goo?
Absolutely!
Given it's been over 30+ years since I purchased them, I doubt JBL would be interested. They no longer make parts for the tweeter anyway.
The tests I did back in '06 were LF tests. Even...
My right channel virgin 4312 from the early '80's (maybe late '70's) started buzzing. It was the LE25-2. I meticulously disassembled it to find a mess inside. How it ever worked all this time is...
Hello!
Except for the one limitation, it's a great piece of software.
After I buy the "Testing Loudspeakers" book, I plan on buying a license.
There are advantages to saving and reloading analysis...
Hello everyone!
I goofed on the url, originally.:o:
I corrected the link in the original post.
The url works now.Actually, both listed url's will work.
Thanks,Johnaec for bringing this to my...
Hello everyone!
Per Zilch's request, here's some...
Hello everyone!
Per Zilch's request, here's some info on the software, ETF 5.XXX, I've been using for these tests.
If you want to download it, it's available as a demo or full version from...
Hello everyone!
Originally posted by Zilch:
I learned so much from these tests, I'm not sure where to start with a summary.
I'll do the best I can-forgive me if I get longwinded.
Lessons...
Last page.
Two reposts:
4312 flush on ground, mic'ed @ 1 meter, skyward measurement, rear boundary interference only,reposted for comparison.
4312,elevated 29", mic'ed @ 1 meter, flush against...
Acoustic tests continued..
Hello!
Well the photos are not great, but that's the cost of using a disposable camera,I guess.
I've tweaked them as best I could.
There should be enough image on each one,to see what I was doing....
Hello!
Originally posted by Zilch:
No problem! I'd like to thank everyone here for their help in diagnosing this problem.A special thanks to Zilch for explaining groundplane testing and for the...
Hello everyone!
Ran tests this morning. Per Zilch's request, I purchased a disposable zoom camera and took photos of the tests.
Groundplane results weren't the same as the JBL specs, but they...
Hello!
Thanks Zilch for explaining that!
I was wondering why the mic had to placed 2X the original free field mic distance.
If I understand this right,the virtual driver like a real driver,...
Hello everyone!
The current amp is a Yamaha P2250.It has a damping factor of >110 up to 1kHz.
I've tried listening evaluations with a Crown Microtech,UREI 6290 and a Mackie M1400 as well.
The...
Hello!
Is this in the neighborhood of what we are talking about?
http://stereophile.com/reference/405time/index1.html
http://www.svconline.com/mag/avinstall_standardized_testing/index.html
I can...
Hello Zilch!
Thank you very much for the tip!
I'm off to Amazon, then on to JBL consumer.
It's nice to know I'm not the only one who has wrestled with this!
I sure wish I had conversed with you...
Hello!
The answer to many acoustic testing questions was already here and I just didn't know where to find it!...
Hello everyone!
Sorry about being a week late.
As promised, here's the skyward test results.
As you can see, the dip only moved upward in frequency because of boundary removal. It's still there,...