This thread is gold! Couple quick questions: Is there a difference between the 2450-SL phragm and the 2451-SL?
Assumption: I can use an 8 ohm phragm in a 16 ohm body and it will operate as an 8 ohm driver (nominal).
This thread is gold! Couple quick questions: Is there a difference between the 2450-SL phragm and the 2451-SL?
Assumption: I can use an 8 ohm phragm in a 16 ohm body and it will operate as an 8 ohm driver (nominal).
Diaphragms are supposed to be the same, but you will sometimes see aquaplas on the surrounds and sometimes not....
There also was a latter 2450SL-A driver with a ribbed diaphragm.
YesAssumption: I can use an 8 ohm phragm in a 16 ohm body and it will operate as an 8 ohm driver (nominal).
(though I would personally always choose a 16 ohms diaphragm over an 8 ohms one when given the choice)
Note that the 476Be and 476Mg are 16 ohms nominal despite what their EDS says.
You're welcome
This was touched on in the third post of that thread:
16 or 32 ohms compression drivers will even let you use some top headphones amplifiers that no speaker amplifier can touch in term of residual noise and distortion: https://www.massdrop.com/buy/massdro...near-amplifier
Another peculiar benefit of using a 16 ohms compression driver compared to an 8 one is that you will be able to use a smaller and cheaper protection cap
Hi Dr.db,
I do not think that 3/4 scaling down would be the best solution. As You know that all JBL 2-inc CD drivers has (almost conical or exponential) horn that 'convert' 1.5inch phase plug opening to 2inch driver mouth. Such horn length is about 6cm to 7cm, so such "transition small horn" can be made if You want A290 to connect with JBL 1.5inch driver.
Other solution can be done using Dr.Yuichi recalculation procedure but starting with 1.5inch driver mouth instead of 2inch. I do not think that it would differ much then previously mentioned adding small 'transition' horn.
I think that EQ 2451Be (if it is Trex-Be) would be greater problem, but if You are using JBL Be (476) diaphragm, then I believe that there would be no problem about EQ it.
regards
ivica
An interesting thread indeed !
I'm looking for a horn that behaves as close as possible to the TH4003 in its dispersion pattern . Talking to Ari about the M2 horn , 4367 but , I'd like to use 650htz as a the crossover point . That leaves the Autotech range or ...get the throat adapter and making a A290 . I have H9800 clones , but not convinced they'll come anywhere near in a 2-way set up .
I want to avoid DSP .... I'd rather take my time and go passive . This my first speaker design from scratch .... I have some very good people helping me and I'm not in a rush .... So here goes . I'll start a thread here and over on diyaudio.com
Parts: 2450SL /4016 BE
JBL 1500AL - 150 litre
Horn ?
Rich
Have a look at the Jbl 2384
It’s getting good feedback from diy
Its huge Ian , and not the prettiest thing to look at . Have you tried any of the Tractix horns ? I can get the 4367 horn ,but I was really hoping to keep the baffle as narrow as possible .
The price of the 2384 is good , Scan it and CNC in wood .
http://www.diyaudio.com/forums/multi...z-510-a-5.html
Rich
How about a pair of clone 4338’s with billet “aluminium” throats?
They are 20.25” X 8.625”
If we knew what the hell we were doing, we wouldn't call it research would we.
They are permanent mold cast from mineral loaded rigid urethane.
Barry.
If we knew what the hell we were doing, we wouldn't call it research would we.
Hi Rich,
Not recently. Depending on your aesthetic needs the Le Cléac’h AH-340 (600mm) could be interesting?
If you are doing a passive crossover from scratch you really need a diy friendly horn
http://www.azurahorn.com
The 2384 is the only modern Jbl horn readily available that will do 650 hertz properly.
If you relax that criteria to 750-800 hertz you can accommodate a narrower baffle.
Hi Barry,
They are nice. I have heard the 4338 and it’s really nice.
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