Pivoting TV-stand/HT-sub/stealth corner - AVS Forum
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post #1 of 15 Old 10-06-2012, 01:19 AM - Thread Starter
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Hi everyone,

Have been reading and learning so I assume not a lot of you will know me but here is my first attempt on building a sub...

Finally coming to a point in the renovation of the house, that I can work on the corner with the gas, electricity and water meters.
This corner will accommodate a closet from floor to ceiling but needs to pivot open to read the meters.
This will be done by hinges on the left side and two wheels under the right side of the sub-woofer, which will function as a TV-stand and all other equipment.

The front face of this bottom part for the sub measures 114cm wide and ±60cm high.
so, with x height = 3.74 ft x ±1.97 ft
The net volume will be at least 400l / 14ft³
There is room for three 15" or two 18" woofers, how to choose? Are smaller ones better? etc.
(I also plan on building two smaller subs to put next to the sofa as side stands)
Although I didn't decide on the type of enclosure, I thought a bass-reflex would be best suited¿
I don't know enough about PPSL but it seems this would lower the frequency in case of a sealed sub¿

The ever lasting discussion about 'how low should it go' is always a problem with HT-subs.
Can I assume 16hz is needed or what do you think about it?

Room size is about 10m x 4.5m x 2.5m or 32.8ft x 14.8ft x 8.2ft

I prefer a bit of efficiency, since I have a couple of old amps that I'd like to use.
One is A-656 Pioneer, dynamic output at 4Ω 2x190W, damping factor 70
The other is from Velleman RMS 2x155W @4Ω, damping >600
Are these or one of them fit for a HT-sub?
If there is no choice, I consider buying an amp.
What about filters? My receiver is a Cambridge Audio azur 540r.
This is not intended to be a reference sub, but how loud should it beat to give good HT experience?

Another thing I like is what I read some time ago on another forum about closing the BR-opening to go sealed in an instant for music.

Please consider I'm from Europe and have not the same options on the driver(s) as in the US, unless the shipping is reasonable.
I also can get 40mm multiplex ( a bit over 1.5") but that might be overkill and reduce the net volume unnecessary...

Anyway, I finally can design for real now, instead of running in circles, but I've learned a lot from forums.
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post #2 of 15 Old 10-06-2012, 03:48 AM - Thread Starter
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crude drawing of intended sub:
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post #3 of 15 Old 10-08-2012, 10:24 PM - Thread Starter
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I'm down to driver choice, in the price range of 500€ or so, for multiple or one driver.
Any recommendations?

thanks.
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post #4 of 15 Old 10-11-2012, 09:20 PM - Thread Starter
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I'm leaning towards the Monacor SPH-450TC.
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post #5 of 15 Old 10-11-2012, 09:22 PM - Thread Starter
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Technical datasheet Monacor SPH-450TC
Impedance (Z) 2 x 4 Ohm
Free air resonance (fs) 20Hz
Max. frequency range f3–1,500Hz
Rec. crossover freq. (fmax.) 400Hz
Music power 2 x 500WMAX
Power rating (P) 2 x 350WRMS
SPL (1W/1m) 93dB
Suspension compl. (Cms) 0.22mm/N
Moving mass (Mms) 305g
Mech. resistance (Rms) 12.7kg/s
Mech. Q factor (Qms) 2.97
Electr. Q factor (Qes) 0.27
Total Q factor (Qts) 0.25
Equivalent volume (Vas) 480 l
RDC DC resistance (Re) 2 x 3.7 Ohm/1 x 7.4 Ohm
Voice coil induct. (Le) 2 x 1.1mH/1 x 4.6mH
Voice coil diameter 99.3mm
Voice coil former aluminium
Voice coil winding height 37.8mm
Air gap height 12mm
Linear excursion (X) ±12.9mm
Eff. cone area (Sd) 1,250cm²
Volume displacement (Vd) 1,612.5cm³
Force factor (BxL) 32.4Tm
Reference efficiency (No) 1.37%
Magnet diameter 220mm
Magnet weight 200oz
Mounting cutout ø 425mm
Mounting depth 220mm
Dimensions ø 460mm
Weight 17kg
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post #6 of 15 Old 10-12-2012, 11:24 PM - Thread Starter
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This is a crude fast drawing of the room it will be in.
Room size is about 10m x 4.5m x 2.5m or 32.8ft x 14.8ft x 8.2ft
Partial wall in the room dividing the kitchen and living room. the ceiling of the kitchen is sloping a bit.
Next to the sub, there's the chimney and a very big masonry stove (proud to say: also diy)
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post #7 of 15 Old 10-14-2012, 08:20 AM - Thread Starter
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Okay then... One last time to proof I have no self confidence rolleyes.gif
Is there anyone who would advice against the Monacor or would advice another driver for HT?
I will place an order next week!
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post #8 of 15 Old 10-17-2012, 07:13 AM
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Just ran across this thread. What did you end up choosing?

YID DIY
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post #9 of 15 Old 10-18-2012, 12:55 PM - Thread Starter
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Ordered TWO Monacor drivers!!

Now for the design....
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post #10 of 15 Old 10-18-2012, 01:24 PM
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the bl spec isn't right, but otherwise the numbers loaded into winisd just fine.

14 cubic feet is a little tight for two of those drivers and the port is going to reduce the volume further.

you will probably need some eq to bring up the bottom end.

otherwise, it should turn out well.

what are your thoughts on the port?

Listen. It's All Good.
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post #11 of 15 Old 10-18-2012, 01:30 PM - Thread Starter
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I can build the sub with one driver and build another one as a table for the sofa.
Isn't the bl correct when coils in series?
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post #12 of 15 Old 10-18-2012, 02:14 PM
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ah, good catch. you are right. are you still thinking 16hz +/- tuning?

Listen. It's All Good.
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post #13 of 15 Old 10-18-2012, 09:19 PM - Thread Starter
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Not so much. Someone pointed me out that room gain would fill in most of the missing part and that this driver shouldn't be tuned below 20hz.
I'm going to use WinISD a bit tonight (it's 6.30 here)
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post #14 of 15 Old 10-20-2012, 07:51 AM - Thread Starter
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I need some help in Sketchup
It seems that I draw lines and surfaces but no real sheets of multiply (18mm)

Thanks

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post #15 of 15 Old 10-25-2012, 07:28 AM - Thread Starter
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Drivers are in! biggrin.gif

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