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
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
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.
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.
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.
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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