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Old 5th September 2009, 02:57 PM   #1
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Default Desktop Sub, I'd like your feedback.

Hi,

I am designing a desktop system. My hope is that It will provide a nice musical experience while seated at the desk and also be "OK" while seated in the middle of the room. I live in England, so my office is 6'X9'!

There are a lot of constraints on this project. First one is 5" foot print for the sub. It is after all, a desktop system ie small than a "bookshelf" system.

My first idea is to use two 2" "subs." in a ~5" cube. One down firing the other rear firing. The idea being that the rear firing sub would extend the bass using a horn-like effect with the back wall (TB 2" subs have a free air res of 90Hz).

The second idea is to use a 4" sub, down firing, in a roughly ~5"x5"X12" box, but this is already starting to get too big for the desktop.

I'd like to hear what you guys think about these ideas. Looking forward to your more learned and experienced input.

I'll put my right left speaker ideas in another thread.

Thanks!
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Old 5th September 2009, 05:08 PM   #2
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Default OMG Subwoofer Calculations!!!

I'm working on designing a desktop subwoofer. I had no idea how complicated this can be!!!

I have a basic idea to design a true desktop system, as in SMALL.

For the sub I was considering using two Tangband 2" subs in a ported box. One down firing and the second rear firing to take advantage, hopefully of extending the bass by wall placement. I live in England and have a 6'X9' office. Rooms are small here, usually. I was also hoping for a 5" foot print, no larger.

I would like to build something that will be musical while seated at desk and "OK," while seated in the center of the room.

However, I did a Vb calculation for only one driver and got 4.59 cubic feet!!!

Is this correct?

Qts = .31
Vas = .31L

I'm totally new to this. Be gentle

Thanks!
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Old 5th September 2009, 05:51 PM   #3
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A 5" footprint... does that mean that you're going to put the sub on the desk rather than the floor?
With an fs of 90Hz and low efficiency I would go with a larger driver. With 2x 2" you can get 86dB/w but with a larger driver you can get down to about 55Hz with the same spl if not higher.

Josh
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Old 5th September 2009, 06:56 PM   #4
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Yes, thanks.
After doing a few calculations, which Iwill post in another thread, I have decided to go with a 4" driver....I think.

and yes, sub on desk...I think...
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Old 5th September 2009, 07:46 PM   #5
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Quote:
Originally Posted by roadsterdriver View Post
Hi,

I am designing a desktop system. My hope is that It will provide a nice musical experience while seated at the desk and also be "OK" while seated in the middle of the room. I live in England, so my office is 6'X9'!

There are a lot of constraints on this project. First one is 5" foot print for the sub. It is after all, a desktop system ie small than a "bookshelf" system.
If you expand your limitations to include a sub that can bolt on below the desk, you'll increase the number of possible options significantly - like a TL or a TH with one of those square TB 4" drivers.
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Old 5th September 2009, 08:37 PM   #6
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I think you should place the sub on the floor below the desk.
Its good to keep your desk clutter free and with the the possibility of building a cabinet larger in volume your sub can go much lower and louder.

Josh
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Old 5th September 2009, 11:04 PM   #7
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Default quency

"Subwoofer" is really a misnomer here. I'm thinking of it more as a bass augmenter which will probably have quite a high crossover point considering the mains will be 3" drivers.

I think a fair amount of the bass coming from this "sub" will be relatively directional due to a highish crossover point. So, I wanted to have it near and more or less on the same plane as the mains.

I'm only theorizing here.

Thanks for your ideas.
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Old 5th September 2009, 11:14 PM   #8
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Default Subwoofer Calculations. Help!

Considering a box for my desktop subwoofer.

Tangband 4" Sub

Vas 4.84L
Qts 0.28

Using online calculator Vb = 1.45L or a roughly 4.6" square box.

That seems very small. Is this correct?

(I haven't got to tuning and porting yet)

I'm totally new to this. So, go slow.

Thanks.
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Old 6th September 2009, 04:12 AM   #9
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Is this viable? Office desk as open baffle subwoofer

GM
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Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
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Old 6th September 2009, 06:22 AM   #10
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Haha, that's really cool!

But, no, it's not an option for me.

Definitely "outside the box!"
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