Subwoofer based on Volt B2549 10" - diyAudio
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Old 20th September 2014, 05:55 PM   #1
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Default Subwoofer based on Volt B2549 10"

Hi,

I'm new to this forum, but definitely smitten by the DIY after making a pair of Troels Gravesen studio 101s.

Now I'm building a subwoofer to extend the frequency of the setup. I have a Volt B2549. I'm thinking to go with the manufacturers specs and make a 100 l ported with a 10 cm x 6,5 cm vent. With the internal dimensions of about. 60h x 40,9d x 40,9w cm.

I'm thinking if using 36(?) mm bamboo for the front and 22 mm mdf for the rest, no bracing.

Question is if anyone's got any recommendations or experiences to share, I'll be interested. If not, I'll simply go with the outline as above and post some pics and experiences here.

I'll be using a balanced external amp, so if somebody has some recommendations for a two way active filter under 500, don't be shy.

Peace, love and happiness, Thor
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Old 22nd September 2014, 12:55 PM   #2
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It's a 100L@18Hz alignment, not bad.
What was the int. volume for the Troels Gravesen studio 101s (13-18L)?
The port was way too small for a good design (driver power). It would need a 9/10cm diameter. Alignments for this would be 13L@47Hz, 18L@40Hz. The 18L (or 22L) would be better to work standalone (no sub) because of less excursion and extension in LF.
If making an appropriate port it will take a lot of internal space but you won't need it with subs probably.

A box shape that has dimensions 60 centimeters by 40.9 centimeters by 40.9 centimeters has a volume of: 100.37 liters/3.5445 cubic feet
A cylindrical shape that has a diameter of 10.5 centimeters and a depth of 65 centimeters has a volume of: 5.6284 liters/0.19876 cubic feet
B2549 (10″) Volume Displaced (Litres): 1.2
(100-7=93)
Using one or two ports (5.7 cm/40 cm length) gives you a good sub speaker tuned low (~18/19Hz).
Xlim Maximum Excursion (mm): @18mm makes the sub work well good to the infras 14Hz (@max power/excursion limit).
F-12 dB 15 Hz
F-24 dB 11 Hz

Nice project. You would need a power amp 250/300W 8 Ohms (RMS).
Volt B2549 (10″)
ScanSpeak Classic 18W/8542 7"
Troels Studio-101
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Old 23rd September 2014, 06:32 PM   #3
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Thanks Inductor!

As for the 101s, I should make a separate thread for it. They're just great. Mine are close to the original specs, about 12-13 litres. Bigger volume and or different ports would make them go deeper for sure, but maybe there would be some sacrifice of the mids, which in mine are pretty good, if I may say so myself ;-) I may do another cabinet for them later though...

Measuring up my ideal sub of 100L I am tempted to reduce to 70L, just so they dont take over the world. WinISD (dont laugh) Says that F3 would be around 24 Hz.

Also I like the idea of using smaller ports. A 65 cm port in a 60x40x40 box would mean an angle, and thats maybe less than ideal?

I plan to use a bridged Electrocompaniet AW 60 FFT on the sub, I think that it means around 240w? I usually listen at moderate levels, so Im not too concerned about loudness.

Hope to start building in a week or two :-)
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Old 23rd September 2014, 10:00 PM   #4
sreten is online now sreten  United Kingdom
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Hi,

For the Volt 60L tuned to 20Hz is your best option IMO.

A box bigger than Vas is always a bad idea, as basically
your driver is too small. A LAB12 12" in 100L tuned to
20Hz is generally a better idea for a 100L cabinet.

rgds, sreten.
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Old 24th September 2014, 07:26 AM   #5
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Hi sreten,

Thanks for your reply. I'm really new to this, so I'll learn as I go along. To tune a 60l box to 20 hz, what would be my port size?

T
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Old 24th September 2014, 12:28 PM   #6
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Default Ports dimensions for VOLT B2549

Yes, for the 101s, as I said already basically the same thing.
In your case, as sreten said already the speakers between 70-60L makes a very enjoyable sub tuned to between 20 and 23Hz.
In the first case (you asked) 60L@20Hz ports are 9.4 cm x 79.5 cm,
In the case of a 70L@23Hz, 2x ports of 7.4 cm x 58.5 cm. Distance between ports 16 cm.
or 3x ports 5.7 cm x 55.8 cm. Distance between ports 12.5 cm.
Finally, in the case of a (VOLT B2549) VB = 65.0 L, FB = 22.0 Hz
1x port of 9.4 cm x 59 cm.

Last edited by Inductor; 24th September 2014 at 12:42 PM. Reason: ports in a reflex 60/65/70L
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Old 24th September 2014, 02:00 PM   #7
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Coolio, thanks!

It seems like the 70L box will give the best response below 80hz. I already have a 10 cm port lying around. Hoping to use it for this project. It seems like a length of 49.17 cm will give me a F3 of about 24 Hz. Based on this calculator

Will using an 90 degrees angle on the port in order to reduce box size affect the performance in a big way?

-T
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Old 24th September 2014, 02:21 PM   #8
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10 cm diameter that is ;-)
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Old 25th September 2014, 10:59 AM   #9
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Quote:
Originally Posted by untinyunity View Post
I already have a 10 cm port lying around. Hoping to use it for this project.
Measure the internal diameter in mm to be accurate.
Larger diameter the bigger the length...
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Old 11th January 2015, 10:07 PM   #10
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Hi,

just chiming in with some pics of the sub, I'm afraid I can't tell you how it sounds as I haven't a proper x-over yet. I have ordered a DBX 223, but wondering if an upgrade to a Marchand Electronics would be worth it....

The materials used are 19mm MDF for top and bottom and 22mm MDF for the sides and finally 40mm Bamboo for the front. I had ALOT of help from a friend CNCing and gluing the parts :-)

All the best!

Thor

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