ROOSKIE
Major Contributor
For those worried about the designers of the woofer and the somewhat unique magnet arrangement.
It is not aesthetic and is a direct contributor to this driver reaching 13.6mm xmax and actually 17+mm when somewhat reduced fidelity is reasonable to accept.
"MMAG was invented by Enrique Stiles, and the MMAG patent (there are several) that applies to the E150HE-44, US6,917,690, was assigned to Step Technologies, Inc. Step Technologies was originally a partnership between two of the best transducer engineers with whom I have had the distinct pleasure of working—Enrique Stiles and Patrick Turnmire (Patrick has done much of the Klippel LSI analysis that has appeared in this column)... While the partnership is no longer together, Enrique is still developing MMAG woofers, the latest example being this month’s first driver to be examined the Dayton Audio Epique E150HE-44. Enrique is now an independent transducer engineering consultant and developed the two new Epique full-range subwoofers in conjunction with the engineering team at Dayton Audio."
"The primary magnetic drive is provided by the 121mm×25mm ferrite rear ring magnet, directly providing flux to the second rear 7mm gap. However, the secondary magnet system is comprised of six 28mm×8mm ferrite disks. These magnets do not add flux to the upper 7mm gap, but rather act as magnetic “diodes” (aka gap balancing magnets) pulling the flux from the main magnet into the top 7mm gap. These disks also provide an 8mm space between the two 7mm gaps as well as a conventional cooling path for the voice coil as it travels between the two gaps."
That said.
If porting
(2)1.5" ports in a .33cuft box is do-able. Tuned to 42hrz the prediction is 15", reality is likely 20% shorter so perhaps 12". That fits.
A pair will hit 112db@1meter without room gain @ 40hrz. Ridiculous for a 5 in a small box. (@13.6mm excursion with 300watts)
To be fair port chuffing may be an issue though it is borderline with these ports. Would have to test.
If running sealed
In dual, tiny, 0.1cuft boxes a pair will hit 106 pre room gain with an f3 of 50hrz and f6 of 43hrz and f10 of 36hrz(even lower if modeled stuffed) when using 6db of bass boost at 50hrz(q1.5). Xmax is reached with 85watts/340 for 6db bass boosted zone.
Again ridiculous for a such a small system and would be great starting point to building small stuff that then easily mates to subs.
Who knows.
As far as a 2 way goes, it appears to have very good off axis response, better than a typical 6.5" despite the huge surround. I see no reason it can not be used as successfully as any typical 5.5-7" driver.
I am thinking a nice shallow waveguided tweeter, a deeper waveguide if sizewise it fits the small box, or even a very robust fat baffle dome tweeter crossed somewhere between 1200-2.2k.
I have not modeled the 7 yet but it seems like more of the same above and more SPL for larger rooms, just in a larger box (2-3 times the size)
Likely would require a 1.2k-1.8k crossover.
Here are HD distortion plots vs the $300 SB Acoustics’ Satori MW16TX-8 Textreme both taken in the same method @94db @1meter
It is not aesthetic and is a direct contributor to this driver reaching 13.6mm xmax and actually 17+mm when somewhat reduced fidelity is reasonable to accept.
"MMAG was invented by Enrique Stiles, and the MMAG patent (there are several) that applies to the E150HE-44, US6,917,690, was assigned to Step Technologies, Inc. Step Technologies was originally a partnership between two of the best transducer engineers with whom I have had the distinct pleasure of working—Enrique Stiles and Patrick Turnmire (Patrick has done much of the Klippel LSI analysis that has appeared in this column)... While the partnership is no longer together, Enrique is still developing MMAG woofers, the latest example being this month’s first driver to be examined the Dayton Audio Epique E150HE-44. Enrique is now an independent transducer engineering consultant and developed the two new Epique full-range subwoofers in conjunction with the engineering team at Dayton Audio."
"The primary magnetic drive is provided by the 121mm×25mm ferrite rear ring magnet, directly providing flux to the second rear 7mm gap. However, the secondary magnet system is comprised of six 28mm×8mm ferrite disks. These magnets do not add flux to the upper 7mm gap, but rather act as magnetic “diodes” (aka gap balancing magnets) pulling the flux from the main magnet into the top 7mm gap. These disks also provide an 8mm space between the two 7mm gaps as well as a conventional cooling path for the voice coil as it travels between the two gaps."
Yes indeed, fitting ports in a small enclosure tuned as low as this driver can be used is tricky and port chuffing will be factor as well.Thanks for posting. Nice to see the performance is good. Hope the 7 inch is as well constructed. The 5 inch needs a passive radiator or two while the 7 inch can be ported fairly easily
That said.
If porting
(2)1.5" ports in a .33cuft box is do-able. Tuned to 42hrz the prediction is 15", reality is likely 20% shorter so perhaps 12". That fits.
A pair will hit 112db@1meter without room gain @ 40hrz. Ridiculous for a 5 in a small box. (@13.6mm excursion with 300watts)
To be fair port chuffing may be an issue though it is borderline with these ports. Would have to test.
If running sealed
In dual, tiny, 0.1cuft boxes a pair will hit 106 pre room gain with an f3 of 50hrz and f6 of 43hrz and f10 of 36hrz(even lower if modeled stuffed) when using 6db of bass boost at 50hrz(q1.5). Xmax is reached with 85watts/340 for 6db bass boosted zone.
Again ridiculous for a such a small system and would be great starting point to building small stuff that then easily mates to subs.
Who knows.
As far as a 2 way goes, it appears to have very good off axis response, better than a typical 6.5" despite the huge surround. I see no reason it can not be used as successfully as any typical 5.5-7" driver.
I am thinking a nice shallow waveguided tweeter, a deeper waveguide if sizewise it fits the small box, or even a very robust fat baffle dome tweeter crossed somewhere between 1200-2.2k.
I have not modeled the 7 yet but it seems like more of the same above and more SPL for larger rooms, just in a larger box (2-3 times the size)
Likely would require a 1.2k-1.8k crossover.
Here are HD distortion plots vs the $300 SB Acoustics’ Satori MW16TX-8 Textreme both taken in the same method @94db @1meter
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