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looking for ideas for 2118H [message #60883]

Wed, 16 September 2009 00:04

Matts
Messages: 359
Registered: May 2009

Grand Master

Hi, I was the lucky winner of a single NOS JBL 2118H 8" driver, with these basic specs:
200 W continuous program power capacity
51 mm (2 in) copper voice coil
70 Hz-7 kHz response
97 dB sensitivity, 1 W, 1 m

The 70hz is based on a 0.5 cu.ft. ported box. It has 'Symmetrical Field Geometry', but no shorting ring. Anyone have any suggestions for using a single one of these? I'm assuming it would be close to Pi one material... I don't have a home theater now, but I guess it would make a wonderful center channel. I also have a single 2226J in the basement... I have set system, w/ very nice Pi 4's already, so I don't need it for that.
Any ideas?

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Re: looking for ideas for 2118H [message #60896 is a reply to message #60883]

Wed, 16 September 2009 21:13

Wayne Parham
Messages: 18678
Registered: January 2001

Illuminati (33rd Degree)

I used to really love the 2115 in a one π loudspeaker, tuned specifically for that driver, of course. I was sad to see it be dropped from the line. Perhaps the 2118 will work for you too.

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Re: looking for ideas for 2118H [message #60907 is a reply to message #60896]

Thu, 17 September 2009 15:07

Matts
Messages: 359
Registered: May 2009

Grand Master

Thanks. I might try it in a Pi One-style cab and see how it sounds. I still have a pair under construction. It's hard to tell how similar the 2118 is to the 2115 because the specs are from different eras! The 2115 specs I found were prior to T-S became common. Looking on the www, it seems these are very popular in car audio. I might try it with a guitar amp. I'll keep an eye out for another one, in the meantime.

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Re: looking for ideas for 2118H [message #60914 is a reply to message #60907]

Thu, 17 September 2009 19:59

Wayne Parham
Messages: 18678
Registered: January 2001

Illuminati (33rd Degree)

You're right that the spec sheet doesn't show T/S values. I don't recall if I got them from someone at JBL or measured them myself but I do remember it worked well in a pretty small box. Here are the T/S parameters and the spec sheet for the JBL 2115:

Vas 1.2ft³
Fts 55Hz
Qts 0.47
Qes 0.54
Qms 4.0

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Re: looking for ideas for 2118H [message #61140 is a reply to message #60914]

Wed, 07 October 2009 09:31

Norris Wilson
Messages: 361
Registered: May 2009

Grand Master

Hi Matts

Here are some JBL 2118H parameters compiled by Drew Daniels.

It looks as if it needs to go in .5 cu ft box, vented or sealed.

I hope this helps.

NW

FS 85Hz
Qts .35
VAS .5 cu ft
Xmax .12 in
Qes .4
Qms 2.4
Re 5.5 ohms
Le .6 mH
BL 11
Mms 17 grams
DB 95.4 1w/1m
Cone diameter 6.5 in
B4 tuning .4 cu ft
FB 91.8 Hz
F3 96.1Hz

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