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Beowulf57
12-21-2008, 07:56 AM
I have a D130 circa 1957. Does anyone know if this kit: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=180253451686&_trksid=p2759.l1259 will fit the voice coil gap?

edgewound
12-21-2008, 02:57 PM
I have a D130 circa 1957. Does anyone know if this kit: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=180253451686&_trksid=p2759.l1259 will fit the voice coil gap?

You should ask the seller... since he's so sure they will be better than OEM JBL kits.

The whole idea of product evolution is to improve the original....which the E130 does in every way....including opening the gap for the new coil.

BMWCCA
12-21-2008, 03:25 PM
The whole idea of product evolution is to improve the original....which the E130 does in every way....including opening the gap for the new coil.Are you saying if I had E130 re-cones Edgewound-installed on my 52-year-old D130s I would enjoy them even more than I have over the past 52-years of my life? :applaud::nutz:

edgewound
12-21-2008, 03:45 PM
Are you saying if I had E130 re-cones Edgewound-installed on my 52-year-old D130s I would enjoy them even more than I have over the past 52-years of my life? :applaud::nutz:

I can't guarantee you're happiness:D...which depends on so many physiological variables at any given moment, but...

Why recone a speaker that's working and you're enjoying? If it stops working, then by all means recone it with OEM parts.

To give you a taste of better enjoyment through product advancement, stick a used E130 in there and try it....or find a nice K130 or D130F frame(alnico and recharge) and recone with E130 parts.

If you don't like it for whatever reason...that's purely your business.

BMWCCA
12-21-2008, 03:56 PM
I can't guarantee your happiness:D...which depends on so many physiological variables at any given moment, but...Are you saying that maybe that "high" point reached in the '70s with my D130s might require the same wacky tabacky to make an E130 recone sound as fine? Any excuse for a party. ;)

Thanks for the suggestions. Maybe I'll try that, just for grins, after I satisfy my 43xx four-way itch and take the 030s out of daily living-room use. Right now my ancient 030s are probably in better shape than my ancient ears! In my small living room, they ARE surround-sound speakers. Rock on!


Edit: What effect does the 8-ohm E130 have on the 16-ohm N2400/075, or does it not care and is the D130 really 16-ohm anyway?

Baron030
12-21-2008, 07:42 PM
Edit: What effect does the 8-ohm E130 have on the 16-ohm N2400/075, or does it not care and is the D130 really 16-ohm anyway?
Hi BMWCCA

I would suspect that the 16-ohm version of the N2400 would not have the correct coil inductance for an 8-ohm E130 driver.
But, it would be a very simple problem to fix.
Just swap out the coil and any other parts on an as needed basis and you should be good to go.

As a reminder, here is a link to an old posting I made about the N2400:

http://audioheritage.org/vbulletin/showthread.php?t=12938

Baron030:)

BMWCCA
12-21-2008, 10:38 PM
As a reminder, here is a link to an old posting I made about the N2400:

http://audioheritage.org/vbulletin/showthread.php?t=12938Thanks. I remember that thread well. Very nice work. It's on my to-do list but then I did pickup a nice pair of Crown VFX2As a year or so ago from a list member that are just sitting here staring at me. Figured I might just bi-amp the 030s for fun, too. My thoughts were a DC300A-II for the D130s and a D150A-II for the 075s. But I also have one LE175DLH so if I can find another for a decent price, the pair of Crown crossovers might really come in handy.

Cheap horns. A New Year's resolution!

Beowulf57
12-22-2008, 07:23 AM
You should ask the seller... since he's so sure they will be better than OEM JBL kits.

The whole idea of product evolution is to improve the original....which the E130 does in every way....including opening the gap for the new coil.

Thanks...I'll send him a query. I'm using the D130 in a back-loaded folded corner horn. Does the E130 have similar parameters, e.g., sensitivity, fs, rising response curve, as the D130? I don't want any higher sensitivity as my left channel uses a D131 in a slightly smaller (but identical design) cabinet and I find no real problem with the slightly more sensitive D130...but any higher might result in an imbalance.

Beowulf57
12-22-2008, 07:50 AM
Edit: What effect does the 8-ohm E130 have on the 16-ohm N2400/075, or does it not care and is the D130 really 16-ohm anyway?

Using a lower impedance driver will drop the response curve of the the LF section of the crossover. The D130 has a 16-ohm impedance...at least the ones I have do.

BMWCCA
12-22-2008, 11:39 PM
The D130 has a 16-ohm impedance...at least the ones I have do.Measured? Or just labeled as such?

Beowulf57
12-23-2008, 07:34 AM
Measured? Or just labeled as such?

Well, the DC resistance is 6.5 ohms...the 16 ohm (AC impedance) version. I'm not sure if JBL made 8 ohm D130's?

BMWCCA
12-23-2008, 08:23 AM
The 1976 component catalog in the LH library shows the D130 as an 8-ohm speaker. Same in the 1969 catalog. Same in '67. From 1964-back they're shown as 16-ohm.

Harvey Gerst
12-23-2008, 10:10 AM
Well, the DC resistance is 6.5 ohms...the 16 ohm (AC impedance) version. I'm not sure if JBL made 8 ohm D130's?
It's an 8 Ohm speaker. Back then, we lied. :p

Beowulf57
12-23-2008, 10:49 AM
The 1976 component catalog in the LH library shows the D130 as an 8-ohm speaker. Same in the 1969 catalog. Same in '67. From 1964-back they're shown as 16-ohm.

One of mine is from 1957, the other from 1961.

Beowulf57
12-23-2008, 10:58 AM
It's an 8 Ohm speaker. Back then, we lied. :p

Right...got it.:) So, both 8 & 16 ohm versions are 8 ohms. Anybody ever do an impedance sweep on the D130 or D131?

Harvey Gerst
12-23-2008, 07:50 PM
Right...got it.:) So, both 8 & 16 ohm versions are 8 ohms. Anybody ever do an impedance sweep on the D130 or D131?
All the time; I was head of QC back then, and they'd hit an impedance orf around 8 Ohms in the trough around 200 to 400 cycles.

Beowulf57
12-24-2008, 06:54 AM
All the time; I was head of QC back then, and they'd hit an impedance orf around 8 Ohms in the trough around 200 to 400 cycles.

Thanks Hifi...so, I assume that the impedance is below that elsewhere? I have my output transformers set to the 16 ohm tap and although this presents no problem at the power levels I use, it is possible that a lower impedance in the mid-bass could contribute to a slight emphasis which appears on some programme material from time to time in that region (also affected by the room modes).

4313B
12-24-2008, 09:02 AM
Thanks Hifi...so, I assume that the impedance is below that elsewhere?around 8 Ohms in the trough around 200 to 400 cycles

Harvey Gerst
12-24-2008, 09:15 AM
Thanks Hifi...so, I assume that the impedance is below that elsewhere? I have my output transformers set to the 16 ohm tap and although this presents no problem at the power levels I use, it is possible that a lower impedance in the mid-bass could contribute to a slight emphasis which appears on some programme material from time to time in that region (also affected by the room modes).
The impedance goes up from the trough, not down. JBL, at the time, felt the 8 Ohm speakers sounded better when hooked to the 16 Ohm output tap.

Beowulf57
12-24-2008, 09:28 AM
around 8 Ohms in the trough around 200 to 400 cycles

:o: Yah...what was I thinking...not a response trough, an impedance trough!:banghead:

Beowulf57
12-24-2008, 09:36 AM
The impedance goes up from the trough, not down. JBL, at the time, felt the 8 Ohm speakers sounded better when hooked to the 16 Ohm output tap.

Better? Yes, I agree as I tried it both ways and preferred the 16 ohm tap on my Peerless 258Q's (lovely potted units wound by Michael LaFevre of Philadelphia to the original Peerless specs back in the early 90's).