replacement for JBL M115-8A

JPeazy · 27th April 2009, 02:12 PM

I need a replacement woofer for my JBL MP-215
Trying to determine if I should go with the OEM speaker(M115-8A) for $170 which seems rather high. Or if I should get something else.

What say all of you?

The original 15" is rated by JBL at 225 Watts RMS / 450 Watts Continuous / 900 Watts Peak. It is 8 ohms.

M115-8A
FS 46
QTS 0.39
QMS 5.1
QES 0.42
VAS 225
EFF 5
PE 250
XMAX 5.1
RE 5.5
LE 1.3
SD 0.0845
BI 14
MMS 53

el`Ol · 27th April 2009, 02:44 PM

An Mms of 53g for a 15" is quite unusual, so I don´t think you get something directly comparable among today´s pro drivers.

JPeazy · 28th April 2009, 03:28 AM

So is there something better. I have very little understanding of speaker parameters and how they interact. I just want to know if I should by the original replacement or if there is something better to go with.

el`Ol · 28th April 2009, 07:30 AM

You can see the moving mass and the suspension as a spring/mass system with resonance frequency Fs. The air in a sealed enclosure that pushes/pulls at the cone surface Sd can also be seen as a spring and the equivalence volume Vas is the enclosed volume that gives the same spring strenght as the mechanical suspension. The result of the low moving mass is that Vas is very high compared to Fs and it fill be hard to find something that fits well.

BillEpstein · 30th April 2009, 01:08 AM

There are a few 15" mid-woofers: Eminence Omega 15 and B&C 100 among others that will do well in your 4 cu ft box but all cost about the same or more as the JBL part and none were designed to the cabinet. Go JBL.

27th April 2009, 02:12 PM	#1
JPeazy diyAudio Member Join Date: Apr 2009	replacement for JBL M115-8A I need a replacement woofer for my JBL MP-215 Trying to determine if I should go with the OEM speaker(M115-8A) for $170 which seems rather high. Or if I should get something else. What say all of you? The original 15" is rated by JBL at 225 Watts RMS / 450 Watts Continuous / 900 Watts Peak. It is 8 ohms. M115-8A FS 46 QTS 0.39 QMS 5.1 QES 0.42 VAS 225 EFF 5 PE 250 XMAX 5.1 RE 5.5 LE 1.3 SD 0.0845 BI 14 MMS 53

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27th April 2009, 02:44 PM	#2
el`Ol diyAudio Member Join Date: May 2005 Location: Bavarian Forest	An Mms of 53g for a 15" is quite unusual, so I don´t think you get something directly comparable among today´s pro drivers.

28th April 2009, 03:28 AM	#3
JPeazy diyAudio Member Join Date: Apr 2009	So is there something better. I have very little understanding of speaker parameters and how they interact. I just want to know if I should by the original replacement or if there is something better to go with.

28th April 2009, 07:30 AM	#4
el`Ol diyAudio Member Join Date: May 2005 Location: Bavarian Forest	You can see the moving mass and the suspension as a spring/mass system with resonance frequency Fs. The air in a sealed enclosure that pushes/pulls at the cone surface Sd can also be seen as a spring and the equivalence volume Vas is the enclosed volume that gives the same spring strenght as the mechanical suspension. The result of the low moving mass is that Vas is very high compared to Fs and it fill be hard to find something that fits well.

30th April 2009, 01:08 AM	#5
BillEpstein diyAudio Member Join Date: Feb 2004 Location: The Great Smoky Mountains	There are a few 15" mid-woofers: Eminence Omega 15 and B&C 100 among others that will do well in your 4 cu ft box but all cost about the same or more as the JBL part and none were designed to the cabinet. Go JBL.

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