Ring Radiator Comparisons

[Mr. Widget]

Here is a comparison we did between a pair of 2404Hs. One was labled 2404H and the other 2404H-1.

[yggdrasil]

Widget, this is great.

The 2402 rolls off earlier than the 2405. Is this due to the horn and / or diaphragm? Have you tested 2402 with 2405 diaphragm?

Just curious?

[johnaec]

Here is a comparison we did between a pair of 2404Hs. One was labled 2404H and the other 2404H-1.

Thanks for posting those! I believe the 2404H-1 uses the 2402 diaphragm and the 2404H uses the 2405 diaphragm.

John

[Robh3606]

Excellent Widget!!!

Thanks for posting those I have to save this thread for sure! It confirms some of my subjective impression when compairing the 2404/2405 when I was doing mock-up's for my 4344's. The 2405's seemed to have more detail and clarity up high with percusion and cymbals than the 2404. When I was building the 4344's I was tempted to try the 2404's but felt the 2405's were better in this respect and went with the stock set-up. Amazing how consistant the 2404's are off axis!!! Looking at the 076 you can keep them. I would just use the slot avoid the peaked response and save some bucks!

Rob

[Zilch]

It's reassuring to note that, at least technically, JBL's been givin' us the straight poop about this stuff, it would appear.

076 DOES have "charisma" going for it.

[I'm over-invested in charisma, obviously....]

Biradial is real, not hype.

[Got my new 2405 diaphragms right here.... ]

[Steve Schell]

Thank you Mr. Widget for your very well and carefully done measurements. I agree that this thread is a keeper.

Just curious; what was the input power used for the measurements, and the distance of the measurement mic?

[Mr. Widget]

The distance was 1m. The power was milliwatts. The SPL measurement is calibrated, so you should be able to get a pretty close answer by using JBL's published sensitivity numbers. We never measured the actual power level. The power level chosen was based on a comfortable listening level during the tests.

Widget

[Steve Schell]

Thanks. I dislike doing 1W tests myself, as they are so doggone loud with high sensitivity drivers. It is also unnecessary, as the curves at lower levels seem to perfectly track the higher power ones.

[IsakAlexander]

Well can any of you experts tell me what this is?


It`s the one 2404 I`ve got, the other two will arrive in 14 days or so. Guess I`ll need new diaphragms for all of them.

[grumpy]

Thanks for the post... reminded me I was supposed to run a test for POS.

[pos]

Thanks for the post... reminded me I was supposed to run a test for POS.

[IsakAlexander]

Well the bargain I got from ebay turned out to be dissapointing. This is what the diaphragm looked like and this was supposed to be the good one:



Is it aftermarket or original and if so what type?
Looks like I will have to get 3 new ones

[1audiohack]

Next up, what's inside the Factory Franken Tweeters, brand new from sealed boxs courtesy of Jeff Keel, the original purchaser/owner. Don't worry Jeff, I'll be gentle!

[toddalin]

Well can any of you experts tell me what this is?


It`s the one 2404 I`ve got, the other two will arrive in 14 days or so. Guess I`ll need new diaphragms for all of them.

Looks to me like a 2404 magnetic assembly and phase plug with a 2402 diaphram that looks aftermarket.

[1audiohack]

With a recently calibrated L.S.Starrett double ball tipped micrometer, all three diaphragms shown in the previous pictures measure right at 0.0020" to 0.0021". No more speculation.

I have to say that pinching an NOS 076 diaphragm between two 0.200" balls almost made me nervous, almost.