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Multi-Way Conventional loudspeakers with crossovers

Replacement woofer for JBL LM38
Replacement woofer for JBL LM38
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Old 23rd June 2010, 05:30 PM   #1
Sam Pietro84 is offline Sam Pietro84  United States
diyAudio Member
Join Date: Jun 2010
Location: Dayton, OH
Default Replacement woofer for JBL LM38

Hi everyone,

Long time lurker...first time post.

I'm replacing the 8" woofers in my 3-way JBL LM38 speakers. The enclosure is ported with a 1.5" diameter tube and the interior volume is 1 cu. ft.

I would like to know whether the Hi-Vi M8a woofer (see attached .pdf) ia a good replacement given the enclosure size and musical detail or would a Hi-Vi M8N or Hi-Vi D8G be better. I listen to all types of music but my goal is to be able to listen to classical music (kettle drum and upright bass - double bass) and have a clear, tight, and detailed reproduction.

I will be replacing the 6" mids and 1" tweeters and crossover soon but I thought I'd start with the woofers first.

Attached Files
File Type: pdf Hi-Vi M8a Woofer.pdf (113.2 KB, 9 views)
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Old 2nd July 2010, 04:55 PM   #2
Sam Pietro84 is offline Sam Pietro84  United States
diyAudio Member
Join Date: Jun 2010
Location: Dayton, OH
WOW... I feel like a major dope!! I don't have JBL LM38's!!!

I have these:

92dB sensitivity
150 watts
14mm Titanium tweeter
6.5" mid woofer
8" bass woofer

Sorry for the mis-information, I was going from memory and memory isn't what it used to be. So as I mentioned before I want to replace the WMT speakers with something more balanced and detailed.

So, I did some research and purchased a pair of HiVi M8a speakers. Swans recommends a 28 liter vented enclosure which matches the volume of the MR38. I think I can tune to the F3 without any issue.

One thing I noticed about the M8a is the high impedance at 33Hz (65 ohm)

I was wondering if I should build a Zobel Circuit for the speaker and if so how can I determine the Le? (The speaker is 8 ohm)

I'm still looking at mid's and tweeters...so does anyone have suggestions that would make building a XO pretty straightforward?

My amp is a SS Sony DTR511 which is about 40W per channel. Nothing fancy but something that serves its purpose.

Thanks in advance.
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