2440 vs. 2441 Diaphragm in 2445-driver

[Dr.db]

Hello,


I´m willing to purchase new original JBL diaphragms for my 2445 drivers.

Which one is better sounding ?
D16R2440 or D16R2441 ?
I will be using the 2445-drivers on 2397 horns crossovered at 800hz and 8khz. Above 8khz I have a 2405-slotdriver....



Thanks a lot,
Olaf

[ivica]

Hello,


I´m willing to purchase new original JBL diaphragms for my 2445 drivers.

Which one is better sounding ?
D16R2440 or D16R2441 ?
I will be using the 2445-drivers on 2397 horns crossover-ed at 800hz and 8khz. Above 8khz I have a 2405-slotdriver....



Thanks a lot,
Olaf

Hi Dr.db,

1.
I would suggest You to use 2450SL or 2451SL diaphragm, depending on the impedance You would be expected ( 8 or 16 Ohms), I think the right codes are D8R2450SL or D16R2451SL if You plan to use the driver up to about 10kHz
http://reconingspeakers.com/product/...0sl-diaphragm/
http://reconingspeakers.com/product/...l-diaphragm-2/

2.
Using D16R2441, may be You would not need to use 2405 UHF driver, as the driver can reach almost 20kHz, without too much diaphragm "ringing" over 12kHz.
http://reconingspeakers.com/product/...441-diaphragm/

3.
Much, more cheaper version can be application of the Radian 1245-8 or 12245-16 Ohms diaphragm if You plan to use the driver up to about 10kHz
http://www.usspeaker.com/radian%20in...tec%20&%20more
http://www.parts-express.com/radian-...8-ohm--294-726
http://www.parts-express.com/radian-...6-ohm--294-728

4.
More expensive then D16R2441 can be Beryllium Truextent 4-inch diaphragm (Be4008 or Be4016 from Materion Brush Wellman), I believe can be used up to 15kHz,
but up to 10kHz seems to be the best (???)
http://www.speakerrepair.com/page/ca...iaphragms.html


Regards
ivica

[NickH]

I've actually used a 2440 diaphragm in a 2445. It sounds quite good. I now use them in 2446's. It still sounds quite good still. It seems to dip off around 8khz as expected. I've used some eq and its very pleasing up to 20k. There's still a dip at 10khz that I measured though. I would bet that new jbl 2440 diaphragm would sound even better.


I've never tried radian diaphragms in them yet. They don't seem to go as high by the datasheet. But I've heard good things about them. There certainly a lot cheaper then the jbl diaphragms.

Nick

[1audiohack]

I have had them both in my 4350's and cannot tell / hear any difference.

I had one each in each side of each enclosure so that I could swap back and forth with a wire change.

I kept the 2440's in and used the 2441's in a two way.

Barry.

[ivica]

Hello,
I´m willing to purchase new original JBL diaphragms for my 2445 drivers.
Which one is better sounding ?
D16R2440 or D16R2441 ?
I will be using the 2445-drivers on 2397 horns crossovered at 800hz and 8khz. Above 8khz I have a 2405-slotdriver....
Thanks a lot,
Olaf

Hi Dr.dB,

May be can give You some ideas:

http://www.audioheritage.org/vbullet...l=1#post311762

regards
ivica

[Dr.db]

Thanks a lot for your helpful answers



I´m actually focused at aluminum dia´s as the titaniums are to harsh in my ears and the berilium too expensive...

So I have the choice between these 3; JBL D16R2440 , JBL D16R2441 and the Radian 1245-16
The radians sound smoother and less dynamic than the original JBL´s, but I like the forward and straight sound a lot...
So I believe I have to go with the more expensive original JBL...
But is there any benefit of the 2440 over the 2441 ?
Does it has a smoother surround or something making it sound better below 8khz than the 2441 ?

As I´m stuck to the 2397 horns and there limitations in the really high freq.-range, I wouldn´t benefit from the extended range of the 2441... but does it manipulate the midrange anyway?

[ivica]

Thanks a lot for your helpful answers
I´m actually focused at aluminum dia´s as the titaniums are to harsh in my ears and the berilium too expensive...

So I have the choice between these 3; JBL D16R2440 , JBL D16R2441 and the Radian 1245-16
The radians sound smoother and less dynamic than the original JBL´s, but I like the forward and straight sound a lot...
So I believe I have to go with the more expensive original JBL...
But is there any benefit of the 2440 over the 2441 ?
Does it has a smoother surround or something making it sound better below 8khz than the 2441 ?

As I´m stuck to the 2397 horns and there limitations in the really high freq.-range, I wouldn´t benefit from the extended range of the 2441... but does it manipulate the mid-range anyway?

Hi Dr.db,

Well, but do not forget JBL 2450SL [ D8R2450], or 2451SL [D16R2451]. Either are very smooth up to 10kHz, on some of my measurements, even less ringing then D16R2441.

regards
ivica

[Dr.db]

But 2450/51 are titanium, right?


I listened to 2441 and 2440 and really liked them! But unfortunatelly there was plenty of time between listening each one and different horns where used too.
So I cannot compare them myself...

I´m just wondering if there is any advantage of the 2440 over the 2441

[ivica]

But 2450/51 are titanium, right?
......

Yes, but SL has a kind of damping material over the diaphragm in order to reduce "diaphragm ringing"
egards
ivica

[NickH]

Dr db,

As far as I've read most people go back to the half roll aluminium surround diaphragm. It doesn't go as high but it sounds better. The diamond surround produces the higher frequencies by creating harmonic break up. At least that's the impression I've got.

I'm currently using 2440 diaphragms in 2446's but I can't compare them with anything else. I've got the 2446 diaphragms but I've never listened to them.

but I'm with you, I try to avoid titanium.

Nick

[Dr.db]

Thanks both of you for your helpful answers

[Dr.db]

Hi Dr.db,

Well, but do not forget JBL 2450SL [ D8R2450], or 2451SL [D16R2451]. Either are very smooth up to 10kHz, on some of my measurements, even less ringing then D16R2441.

regards
ivica

Have you had the chance of any listening comparisons ?

The 2450sl diaphragm has damping aquaplas and this means added mass
Does it sound as dynamic and has the same clear resolution as a "pure" 2440 alloy diaphragm...??

[ivica]

Have you had the chance of any listening comparisons ?

The 2450sl diaphragm has damping aquaplas and this means added mass
Does it sound as dynamic and has the same clear resolution as a "pure" 2440 alloy diaphragm...??

Hi Dr.db,

I have not such chance, as each diaphragm would need its different equalization , and after that EQ can be compared

regards
ivica

[Dr.db]

Thanks a lot

Hi Dr.db,

1.
I would suggest You to use2450SL or 2451SL diaphragm, depending on the impedance You would be expected ( 8 or 16 Ohms), I think the right codes are D8R2450SL or D16R2451SL if You plan to use the driver up to about 10kHz

Regards
ivica

Are you shure both these diaphragms will fit in my 2445 without any trouble?

[1audiohack]

They absolutely will, with one caveat, that there is no large discrepancy in the phase plug height and or diaphragm height.

Often there will be a plus or minus number on the driver top plate made with a felt tip marker and one written in ball point pen inside the the voice coil on the former. These are matched up fairly closely when new.

The maniacs among us will buy a dozen diaphragms and mix and match with a dozen drivers to get as close as we can get.

If you are just doing a couple you get what you can get. The vast majority of the time they are close enough, for the majority.

Barry.