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SA-8 Prototype Is Here !


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How does a manufacturer determin what the rms would be for a sub exacly.

X2

My comp setup (Not bad for what it is):

HP Compaq Presario V6120US laptop with:

15.4" widescreen

AMD Turion 64 X2 1.6GHz processor

2x1GB stick DDR2 SDRAM (667 Mhz)

Seagate Momentus 500GB SATA HDD

128MB shared video memory

Windows 7 Home Premium 64 bit

12 cell Lithium Ion battery (actual battery usage time: 6 hours)

What it does:

635670364.png4532707.png

On a USB 2.0 Wireless card

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Detaillllllssss????

I sheared the aluminum former in two -- didn't break any glue joints or thermal the coil. I suspect I bottomed out my triple joint ring on the top plate hard enough that the shock broke off the former. Of course I had 2000 or so watts per sub at this point too -- something has to go eventually.

I will add a LITTLE more rearward clearance on production models so even doing that will be slightly more difficult.

- Jacob Fuller

- Owner, Sundown Audio

- Sundown Audio on FACEBOOK

- Please DO NOT PM ME -- use my email address -- [email protected]

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I sheared the aluminum former in two -- didn't break any glue joints or thermal the coil. I suspect I bottomed out my triple joint ring on the top plate hard enough that the shock broke off the former. Of course I had 2000 or so watts per sub at this point too -- something has to go eventually.

I will add a LITTLE more rearward clearance on production models so even doing that will be slightly more difficult.

Dammmnnnn... Wonder how much power they wouldve taken had that not happened.

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  • 2 weeks later...

I bought two DD 1508 to compare T/S specs to... the DD 1508 is WELL broken in as it is used.

Sundown SA-8 (D2) / DD 1508 (D4) :

RE: 3.28 ohms (series) / 7.48 ohms (series)

FS: 41.6 Hz / 44.6 Hz

Qes: 0.513 / 0.844

Qms: 6.606 / 9.217

Qts: 0.476 / 0.773

Le: 2.778 mH / 6.446 mH

Vas: 3.285 L / 4.672 L

BL: 17.138 N/A / 17.78 N/A

Cms: 83.341 um/N / 99.97 uM/ N

Mms: 175.654 g / 126.977 g

Sens: 78.476 dB @ 1w/1m / 78.77 dB @ 1w/1m

BL^2/RE: 89.5 / 42.26

BL^2/RE is an indication of static motor strength. Since BL doesn't tell you how strong a motor is without knowing the DCR this measure allows you to compare speakers with different DCR to each other.

For comparison shoppers this will give you an idea of what works best for you -- I couldn't find the T/S anywhere else for the 1508s so I got some :)

- Jacob Fuller

- Owner, Sundown Audio

- Sundown Audio on FACEBOOK

- Please DO NOT PM ME -- use my email address -- [email protected]

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I bought two DD 1508 to compare T/S specs to... the DD 1508 is WELL broken in as it is used.

Sundown SA-8 (D2) / DD 1508 (D4) :

RE: 3.28 ohms (series) / 7.48 ohms (series)

FS: 41.6 Hz / 44.6 Hz

Qes: 0.513 / 0.844

Qms: 6.606 / 9.217

Qts: 0.476 / 0.773

Le: 2.778 mH / 6.446 mH

Vas: 3.285 L / 4.672 L

BL: 17.138 N/A / 17.78 N/A

Cms: 83.341 um/N / 99.97 uM/ N

Mms: 175.654 g / 126.977 g

Sens: 78.476 dB @ 1w/1m / 78.77 dB @ 1w/1m

BL^2/RE: 89.5 / 42.26

BL^2/RE is an indication of static motor strength. Since BL doesn't tell you how strong a motor is without knowing the DCR this measure allows you to compare speakers with different DCR to each other.

For comparison shoppers this will give you an idea of what works best for you -- I couldn't find the T/S anywhere else for the 1508s so I got some :)

jacob, can you drop those dd's in the same box you made and compare the numbers with the sa-8?

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I cannot -- the hole cut-out is way too big. We cut it slightly too big for the SA-8 even (hence the duct tape) and the DD cut-out is smaller.

Now... Derrick and I plan to build another box and get the hole cut-out perfect... if so then the DD should seal up with some duct tape.

- Jacob Fuller

- Owner, Sundown Audio

- Sundown Audio on FACEBOOK

- Please DO NOT PM ME -- use my email address -- [email protected]

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