Sorry, you mean to say that they're using different dome materials for the different impedance versions?
That's an odd question.. he he. No and I'm not sure why you are asking. So had to check the Fr response for both. The 8ohm has less cone breakup above 20kHz@60 degree. The only reason this exist - in my mind - is less motor control on the 4ohm. Its not an issue bellow 20kHz, but non the less, interesting to see. Thanks for pointing it out
2x MW16TX-8: Sealed vs Aperiodic vs Ported (Bass reflex) - Simulated
Ql is the Q-value due to unwanted enclosure and woofer leakage losses
Qa is the Q-value due to enclosure damping material (or absorption losses)
Qp is the Q-value due to port losses
In normal cases Ql is in the range 5-20. Ql is 7 in most cases, but 15 to 30 if the enclosure has very little leakage. Ql may be 7 even with an enclosure with no leakage because the driver unit itself may have leakages.
A box with moderate lining has a Qa of about 30. A heavily stuffed box can have a Qa of 3. Qa is 7 for about a half-filled enclosure.
A perfect port will have absolutely no losses in which case Qp is very large. A good port, one which does not significantly restrict air flow, has about 100 of Q-value.
***
For the sealed cab, I used a Ql = 30 to simulate a very tight cab.
For the aperiodic cab, I used a Ql = 1.9 which kept the Group Delay bellow 3ms.
For the ported cab, I used a Ql = 30 just like for the sealed.
Keep an eye on the phase response (gray curve in the impedance column), impedance and group delay (transient response)
***
Which enclosure would you build and why ?
Click the X in the bottom left corner for full size.
Ql is the Q-value due to unwanted enclosure and woofer leakage losses
Qa is the Q-value due to enclosure damping material (or absorption losses)
Qp is the Q-value due to port losses
In normal cases Ql is in the range 5-20. Ql is 7 in most cases, but 15 to 30 if the enclosure has very little leakage. Ql may be 7 even with an enclosure with no leakage because the driver unit itself may have leakages.
A box with moderate lining has a Qa of about 30. A heavily stuffed box can have a Qa of 3. Qa is 7 for about a half-filled enclosure.
A perfect port will have absolutely no losses in which case Qp is very large. A good port, one which does not significantly restrict air flow, has about 100 of Q-value.
***
For the sealed cab, I used a Ql = 30 to simulate a very tight cab.
For the aperiodic cab, I used a Ql = 1.9 which kept the Group Delay bellow 3ms.
For the ported cab, I used a Ql = 30 just like for the sealed.
Keep an eye on the phase response (gray curve in the impedance column), impedance and group delay (transient response)
***
Which enclosure would you build and why ?
Click the X in the bottom left corner for full size.
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Will probably be similar to MR 5" satori.
Wd like to see a company do a dedicated mid with a surround similar to Bowers and Wilkins
I would wait with the wow reaction until they are available from other vendors. Don't complain yet unless you have heard them. There is no 3rd party measurement or proper listening reviews yet. If the performance is top notch, then the price might be justified. Its a new material, some new (perhaps) motor features etc.
