Fine fine fine...Mag v4 T/S's. ;)

hobie1dog · 07-28-2008, 10:06 PM

Quote:

Originally Posted by M-Special

But WinISD has led me astray before.

NO WAY......YES WAY

gushybear · 07-28-2008, 10:11 PM

if i were to go 1.2 cu ft per sub do you think that'd be better than the 1 cu ft ? my WIN ISD is saying so... but as ppl have posted earlier here maybe its wrong?

i havent begun construction on this box so i figure i might as wellc hange it now if necessary.

soydeedo · 07-28-2008, 11:47 PM

I'm no expert [at all], but he did say that after a bit of break-in the Fs would go down, and we know after break-in the suspension loosens up a bit and Cms goes up. Since these parameters were taken before break-in it's reasonable to expect WinISD to recommend a larger sealed box since with the given stiffer Cms value it doesn't need as much help from the air spring as it would once it loosened up.

***Electrodynamic*** · 07-29-2008, 08:19 AM

As those two parameters (Fs and Cms) shift, so will Vas and Qts. When they shift, it will actually spit out (in WinISD) a larger enclosure. However, the key here is that we weren't shooting for the coveted .707 alignment, which WinISD always opts for. To reach the goals of the new Mag we aimed for a higher Qtc.

The Mag v4 is rated for power handling up to 1000 watts RMS in 1 ft^3.

You can put your Mag in 1.2 or 1.5 ft^3, but power handling goes down from the 1000 watt RMS rating. In 1.3 ft^3 you're looking at ~750 watts RMS and in 1.5 ft^3 you're looking at ~600 watts.

TheOtherSide · 07-29-2008, 11:52 AM

Doesn't WinISD have trouble with the linear BL curve of the XBL^2 topology as well? I thought I remembered that from the Adire days.

sundownz · 07-29-2008, 01:22 PM

XBL^2 drivers maintain their specs better vs. excursion so the "Qtc vs. excursion" is actually lower despite a technically higher small signal Qtc. This means that for a given, calculated, Qtc an XBL^2 driver will always have a lower Qtc at higher excursion levels.

***Electrodynamic*** · 07-29-2008, 01:53 PM

Hrm...it has a Qtc vs. excursion plot? Just goes to show you how much time I spend with the program.

sundownz · 07-29-2008, 04:56 PM

Quote:

Originally Posted by Electrodynamic

Hrm...it has a Qtc vs. excursion plot? Just goes to show you how much time I spend with the program.

Even WinISD doesn't have that - but if it did have one thats what it would show

Adire had some charts of Qtc vs. x-max in the great debate with Matt Overpeck.

*Tirefryr* · 07-29-2008, 06:03 PM

Quote:

Originally Posted by sundownz

debate with Matt Overpeck.

Not much to debate with that guy.

Subwoofery · 07-30-2008, 04:39 AM

Stupid of me but how does the new mag sounds compare to the Adire Brahma in a sealed box.
Seems like the Xmax has been reduced... Can nick explain why that route? Especially going sealed, Xmax is supposed to be more important for sealed. Maybe I'm wrong lol.

07-29-2008, 08:19 AM	#14 (permalink)
*Electrodynamic* Stereo Integrity Owner Join Date: Mar 2008 Location: Charlotte, NC Posts: 705	As those two parameters (Fs and Cms) shift, so will Vas and Qts. When they shift, it will actually spit out (in WinISD) a larger enclosure. However, the key here is that we weren't shooting for the coveted .707 alignment, which WinISD always opts for. To reach the goals of the new Mag we aimed for a higher Qtc. The Mag v4 is rated for power handling up to 1000 watts RMS in 1 ft^3. You can put your Mag in 1.2 or 1.5 ft^3, but power handling goes down from the 1000 watt RMS rating. In 1.3 ft^3 you're looking at ~750 watts RMS and in 1.5 ft^3 you're looking at ~600 watts. __________________ Electrodynamic Don't install suckage!

07-29-2008, 11:52 AM	#15 (permalink)
TheOtherSide Junior Member Join Date: Mar 2008 Location: Atlanta Posts: 21	Doesn't WinISD have trouble with the linear BL curve of the XBL^2 topology as well? I thought I remembered that from the Adire days. __________________ Ride: 03 Ext Cab Chevy Silverado Kenwood x979; Memphis 1000D and MCA3004; Crystal SSCS6; SI BM 12 in 2.25 cubes@32

07-29-2008, 01:22 PM	#16 (permalink)
sundownz Member Join Date: Mar 2008 Posts: 143	XBL^2 drivers maintain their specs better vs. excursion so the "Qtc vs. excursion" is actually lower despite a technically higher small signal Qtc. This means that for a given, calculated, Qtc an XBL^2 driver will always have a lower Qtc at higher excursion levels. __________________ - Jacob Fuller - Owner, Sundown Audio - Associate, Stereo Integrity

07-29-2008, 01:53 PM	#17 (permalink)
*Electrodynamic* Stereo Integrity Owner Join Date: Mar 2008 Location: Charlotte, NC Posts: 705	Hrm...it has a Qtc vs. excursion plot? Just goes to show you how much time I spend with the program. __________________ Electrodynamic Don't install suckage!

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07-28-2008, 10:11 PM	#12 (permalink)
gushybear Member Join Date: Jul 2008 Posts: 86	if i were to go 1.2 cu ft per sub do you think that'd be better than the 1 cu ft ? my WIN ISD is saying so... but as ppl have posted earlier here maybe its wrong? i havent begun construction on this box so i figure i might as wellc hange it now if necessary.

07-28-2008, 11:47 PM	#13 (permalink)
soydeedo Junior Member Join Date: Mar 2008 Posts: 38	I'm no expert [at all], but he did say that after a bit of break-in the Fs would go down, and we know after break-in the suspension loosens up a bit and Cms goes up. Since these parameters were taken before break-in it's reasonable to expect WinISD to recommend a larger sealed box since with the given stiffer Cms value it doesn't need as much help from the air spring as it would once it loosened up.

07-30-2008, 04:39 AM	#20 (permalink)
Subwoofery Junior Member Join Date: Apr 2008 Posts: 28	Stupid of me but how does the new mag sounds compare to the Adire Brahma in a sealed box. Seems like the Xmax has been reduced... Can nick explain why that route? Especially going sealed, Xmax is supposed to be more important for sealed. Maybe I'm wrong lol.

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