JBL L150 speaker help

[mrbluster]

Hello, Earl,

Thanks for all of your suggestions. I do have a Mac.

Would you or Giskard be able to provide me with port dimensions if I were to put two of these woofers in my L150 cabinets as Giskard suggested.
(tuned around 30-32 Hz).

I don't know the volume of these cabinets. Perhaps you do? I know they are a lot bigger than the two cubic foot example you sent me.

Again, thanks for all of your useful input. I appreciate it.

Regards,

mrbluster

[Earl K]

Hi

- I believe on the first page of this thread, Rob states that the volume of the L150 is @ 3.97 cu'.

- A ME120h in 2 cu' can achieve a 31hz tuning with a 4" round port @ 14.7" long . ( this port length varies slightly with the software program used )

<> Earl K

[mrbluster]

Thanks to Earl and Giskard for your patience. I realize I am all over the place with this project. Let me throw this out. I can restore the L150 with an original 128 and passive unit, or I can use one or more ME120HS drivers as per the previous discussion. I am hoping to tap into you expertise, to avoid experimental "improvements" that ultimately will disappoint. (Such as the many attemps to re-engineer the L65) I realize that some things must be tried in the "real world" to determine there worth or downside, but with the benefit of your years of experience, perhaps I can be directed to put my energy into the most rewarding direction.

Sincerely,
Mrbluster

[mrbluster]

Black faced, think it is an L150 with 033 HF.

[mrbluster]

With the ME120HS, (I assume you mean two) how would I wire them?
Mrbluster

[mrbluster]

Perhaps you are talking about a single with the original Passive?

[johnaec]

If you recently picked up those empty cabinets off eBay, I believe they were the L150A version, which would mean the crossover is tuned to the 044 HF.

John

[mrbluster]

RE: Twin ME120HS I am also assuming I will then need an appropriate port? Or could it work sealed?

[mrbluster]

Thanks, will get back to you when I have something to report. In the meantime If you or anyone else could come-up with the port configuration I would be grateful. If there is potential in this upgrade, I would like to know that I have all the basic info to move forward. My guess is that ME120HS would not be suited to a sealed cabinet.
Regards,
Mrbluster

[mrbluster]

Point well taken!
Much thanks, Giskard .
I'm out of here as well.

Mrbluster

[johnaec]

One quick question before you guys bail - are those frames basically the same size as the LE14 series, (with the squared-off baskets), or some other variation that fits in a 12" speaker cutout?

John

[Don C]

I hate it when you guys delete part of a thread before I have read it, nothing makes sense.
The speakers shown on the last page look nothing like LE-14s from the back.

[Zilch]

If those parameters are right, and assuming I entered them correctly, WinISD says two ME120HS in 3.97 cu.ft. box tuned to 32 Hz. wants one 4" port 5.31" long.

It's down 3 dB at 60 Hz, and down 9 dB at 30 Hz, the "knee" occuring just under 40 Hz.

Two of them in a closed box that size are down 3 dB at 95 Hz, and down 9 dB at 45 Hz, not good.

"Optimally flat," a single driver wants a 1 cu.ft. box tuned to 47 Hz. Two drivers want 2.137 cu.ft. tuned the same. Note: WinISD also generates impractical results for Sub1500.

A major problem with the proposed scheme is that, wired either in series or parallel, two of these are not going to match the stock network impedance.

I don't know what's up with this thread, either. Looks like some good stuff got deleted, alas....

[Earl K]

Hi John

or some other variation that fits in a 12" speaker cutout?

The LE120h is a different woofer from the pictured Me120h . Paragon posted the necessary pictures of one of his LE120h(s) to arrive at that conclusion. Different magnetic assemblies and different gap depth.

The LE120h ( should ) be an evolution to the 128h or 2214h - maybe 2213h . It might be a nice 12" "Project" speaker for the DIYer. Unfortunately, without a JBL published response curve and some Ts parameters - that's still conjecture .

Don / Zilch ;
Re; deleted posts

- Sometimes others wish they just hadn't got involved.
- Myself, I just stop talking, others are more proactive .
- The deletion time-limit of 24hr, gives a form of ownership to the poster that I support .
- People forget they don't "own the library book".

<. Earl K

[paragon]

LE 120H