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-   -   W4-1320SB Golden Ratio BR (http://www.diyaudio.com/forums/full-range/69106-w4-1320sb-golden-ratio-br.html)

sharpi31 4th December 2005 11:19 AM

W4-1320SB Golden Ratio BR
 
Just starting to build my small BR cabinets for the tang bands today.

I have modelled the drivers usind WinISD and have settled on a 4.08 litre box with port tuned to approx 80Hz.

The dimensions I have calculated (according to the golden ratio) are:

height 26.9cm
width 16.6cm
depth 10.3cm

I will be adding approx 1cm to each dimension to account for the wool carpet lining (approx 5mm thick on all internal walls).

The port is going to be made out of a heavy duty cardboard tube, internally 4.9cm diameter, externally 6.1cm diameter. Port length will be 17.52cm, folded internally and exiting sideways from the cabinet.

Oh yeah, the above dimensions include the volume of the port so that I maintain a 4.08 litre effective cabinet volume.

Will hopefully report back later.

sharpi31 8th December 2005 03:43 PM

Got the boxes finished but not used the filler or sander yet.

I tried the drivers in the un-polished boxes and they sound great. Very directional, due to the full range driver. Bit thick in the lower mid / upper bass. I think this is due to the relatively light damping insides the cabinets. I will remove the drivers and try some pillow stuffing tonight and try to tame the beast.....

Exception coherence and timing though. I'm sure these will kick some **** by the time they are finished.

At the end of the day these are already better than they should be for the cost of the drivers and the size of the boxes. Bass is more than adequate for the job. Photos to follow.

Godzilla 8th December 2005 04:35 PM

stuff it...
 
>>> Bit thick in the lower mid / upper bass.

Yeah, share pics! I think all of the TB's i've owned sounded this way. Stuffing is cure.

http://www.zillaspeak.com/Bamboo.asp

Peace,
Godzilla

planet10 8th December 2005 09:12 PM

Godzilla... from your website:

Quote:

2.2 cubic foot or just under 7 liter box
7 litres = 7,000 cm^3 = 427.2 in^3 = 0.247 ft^3

2.2 ft^3 ~ 61 litres

dave

Godzilla 8th December 2005 09:50 PM

LOL! Thanks!


http://www.zillaspeak.com/CabinetVolume.asp


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