Thiele Small parameters JBL E110's

[head_spaz]

Years ago (1980) I bought four brand new JBL E-110's for my guitar amp project. They are way too hot for guitar! They really will bleed your ears.
Anyway, I special ordered these with four ohm voice coils. (OC Speaker, in Garden Grove Calif)

I have a photo copy of the original spec sheet, and it shows the efficiency rating at an unbelieveable 108dB / 1W / 1M. (!!!)

108dB is truly incredible compared to today's offerings. Does this SPL spec sound right? Has the measurment standard changed since the early 80's?

I used to work at Altec Lansing, and for a while I did the production line testing for all their drivers. This was around 1975 or so... and I remember they were hellaciously baddass drivers.
These JBL's are even better than the altec's.

Anyone have the Thiele Small parameters for these bad boys?
Would Raven 1 ribbons be a good tweeter match with these in an MTM?

Regards,
David

 

[Pano]

Fs: 65Hz
Re: 6 Ohm
Qms: 4
Qes: 0.4
Qts: .36
xmax 2.5 mm
Le 0.4
Sensitivity: 97dB watt

That's for the 8 ohm version.

Don't know what the 4 ohm would be like. Should play louder at the same voltage.

 

[head_spaz]

Thank you Sir.
I've googled many times... never found those specs.

Might make better midranges eh?

Gotta get me a Gauss for a sub I guess.

 

[Brett]

http://www.jblproservice.com/pdf/Thiele Small Parameters/Theile Parameters.pdf

 

[Pano]

Might make better midranges eh?

They should make very lively, dynamic midranges - indeed!

 

[richie00boy]

They might be skewing the efficiency by 3dB by using 2.83V as the drive voltage. It's surprising how often this happens. Even so 105dB is impressive.

 

[Brett]

They might be skewing the efficiency by 3dB by using 2.83V as the drive voltage. It's surprising how often this happens. Even so 105dB is impressive.

JBL datasheets says 98dB, swept 500-2500 at 1W/1m.