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Old 30th January 2008, 12:52 PM   #1
Asdonk is offline Asdonk  Netherlands
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Default SVS pb10 cloned

I have laid my hands on a SVS PB10nsd woofer and the 300 Watts BASH amp
I also have found someone who has measered the TS parameters
some further info is the vent is about 34 cm long and 3 inch
in diameter
some calculations give a netto volume off 62 to 64 liters
someone ever cloned or rebuild this subwoofer, it will only be used for movies
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Old 31st January 2008, 08:13 AM   #2
cph2000 is offline cph2000  Denmark
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interesting woofer ! Could you post T&S numbers and maybe how you got your hands on it (I take it that it did not fall off the back of a truck ) ?
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Old 31st January 2008, 09:01 AM   #3
Asdonk is offline Asdonk  Netherlands
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no it did not fall off the back of a truck
the woofer and amp where sold by the former dealer over here in Europe, now you have to order through L Sound
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Old 5th February 2008, 12:47 PM   #4
Asdonk is offline Asdonk  Netherlands
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the measured T&S parameters are

Qts 0,35
Fs 27,4 hz
Vas 60 l
Re 3,3 ohm
BL 13,42
Le 1,32
Sd 310
X max 16 mm
Pe 300 W

winSD gives a -4 db at 24 hz, as the BASH plateamp has a build in boost, 20 hz must be possible
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Old 5th February 2008, 05:49 PM   #5
GM is offline GM  United States
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Quote:
Originally posted by Asdonk
the measured T&S parameters are........
Sorry, but the specs don't add up. with a 13.42 BL a Qes around 0.24 is required, so no way Qts = 0.35 or vice versa. Since Vas is the hardest to properly measure, maybe this is what's screwing up the numbers.

Regardless, please post Qes, Qms too.

GM
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Old 5th February 2008, 05:59 PM   #6
Asdonk is offline Asdonk  Netherlands
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Qes 0,37
Qms 6,28
Qts 0,35

these are the measured T/S
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Old 5th February 2008, 07:24 PM   #7
GM is offline GM  United States
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OK, thanks, but it still doesn't mean that Vas isn't wrong as BL now calcs around 10.88, which has a big effect on cab Vb.

Anyway, based on these specs a max BW alignment will be around 0.707*Fs with a ~ Vb = Vas EBS alignment, but due to the low Vas the vent will be excessively long, so a mass loaded reverse tapered TL (ML-TQWT) makes more sense to me. Corner loaded it should be solid into the teens, though its low Pe will keep it from getting to DD/DTS reference level if that's a performance goal.

Now if you can 'afford' a larger, ~81+ " tall cab and the T/S specs are close, a tapped horn sims an eyeball flattening ~125 dB with only ~140 W, but the trade-off is it's ~280.64 L + all the panel thicknesses, though if it can be laid down along a wall to fire into the corner it can be fairly small in cross section with only one bend 122+" long and of course more folds can be used to reduce its height if taking up a larger floorspace isn't a major issue:

GM
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Old 14th October 2008, 04:58 PM   #8
Asdonk is offline Asdonk  Netherlands
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no warranty on seperate amp panel bought from Europian SVS
dealer

here goes the project, as the Pb10 amp panel is not working at all
just about 10 months old

I contacted L Sound and this is what they answered today :

I just got a message from SVS now. I just wanted to check if M-Pro had a different sales policy since we do not sell separate SVS parts to DIY projects I am afraid. Warranty doesnít count on separate parts and M-Pro shouldnít have sold you these parts. L-Sound do not sell any DIY parts to customers either. I am very sorry about this.



Please let me know if there are anything I can help you with but we canít give you a new amplifier since there are no warranty on the amp plate itself. The amplifiers which all SVS dealers have are for replacements only when a customer have bought a whole subwoofer.



Regards,

Jan
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