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Old 12th August 2009, 07:16 PM   #1
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Default Subwoofer box

I am looking for a box design for a HERTZ HX300D speaker.
It will be used as a surround sound sub woofer in a rather large room, about 10 x 15 meters. I will try to supply other info if needed. Thank you.
Roelof
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Old 20th August 2009, 09:00 AM   #2
bjorno is offline bjorno  Sweden
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Default Subwoofer box

Hi R,

Here is a suggestion for the HERTZ HX300D driver: picture 1(2)-2(2)

b
Attached Images
File Type: gif 1-Hertz-TL_T-TQWT.GIF (49.1 KB, 411 views)
File Type: gif 2-Hertz-TL_T-TQWT.GIF (69.7 KB, 376 views)
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Old 20th August 2009, 10:30 AM   #3
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Default Hertz subwoofer

HI B, thank you for the detail. I just have a bit of a problem trying to work out what the drawing is all about. The details of the box I mean. The details are very vague or maybe I am I bit to dumb to understand. Please help me a bit more. Thank you.
Roelof
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Old 20th August 2009, 09:18 PM   #4
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by R van Heerden View Post
..The details are very vague or maybe I am I bit to dumb to understand. Please help me a bit more..
Roelof
Hi Roelof,

Don't blame your self for poor understanding of my simple drawing: You are of course right: the drawing is very vague...

I checked the drawing again and found one faulty number, now revised. This can be seen in the slightly updated picture 1(1) here below.

My simple drawing is just an example how to fold the HR simulation if happen to be a straight pipe, i.e. a T-TQWP a.k.a. T-TQWT.

The suggestion was to pick one of the L length's between 2,6 m to 3 m.

As this length is unknown, I left out the vertical dimensions to be a calculation exercise for any user of this particular drawing.

For a first trial: use L/4 for the internal height and calculate if all sums up to within about 5 % of the chosen L, IMO good enough.

b

1(1)
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File Type: gif compact_Hertz_T-TQWT_rev.GIF (16.9 KB, 362 views)
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Old 22nd August 2009, 08:04 AM   #5
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Default Herz subwoofer

Hi B,
Thanks again for the info. I can build that box if I can work out where the supports must be. Please excuse me, I am a retired electrical eng. and not an audio guru at all. This is my first speaker box building excersize. What is "L" If I take it as 2,8 m and make the inside of the box 700mm. That just looks like a good guess to me ?
Thanks again
Roelof
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Old 22nd August 2009, 01:07 PM   #6
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by R van Heerden View Post
Hi B,
Please excuse me, I am a retired electrical eng. and not an audio guru at all. This is my first speaker box building excersize. What is "L" If I take it as 2,8 m and make the inside of the box 700mm. That just looks like a good guess to me.. ?
Hi Roelof,

I guess we have a similar background and maybe age too..

2.8 m length is a good choice,see the pictures where also a OD.Offset driver TL is plotted for comparison.

This could be a good option to use if the speaker is placed closely to a short wall corner when over-emphasizes of low end modal FR is expected.

b
Attached Images
File Type: gif 3-Hertz-TL_T-TQWT.GIF (153.4 KB, 288 views)
File Type: gif 4-compact_Hertz_T-TQWT_bracings.GIF (26.7 KB, 276 views)
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Old 22nd August 2009, 04:22 PM   #7
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Default Herz subwoofer

Hi B,
Thanks for the info. I am going to study this a bit and will get back to you if there are problems (and you do not mind)
Regards
Roelof
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Old 23rd August 2009, 03:17 PM   #8
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Default Hertz subwoofer

Hi B, the bracings as shown, are these flat pieces on the left and right, or are they in the centre of the box? (looking at the box from the face of the speaker)

Kind Regards,
Roelof
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Old 23rd August 2009, 08:47 PM   #9
bjorno is offline bjorno  Sweden
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Default Hertz subwoofer

Quote:
Originally Posted by R van Heerden View Post
Hi B, the bracings as shown, are these flat pieces on the left and right, or are they in the centre of the box? (looking at the box from the face of the speaker)

Kind Regards,
Roelof
Hi Roelof,

Yes they are all flat vertically oriented pieces dividing the box in half looking from the face of the speaker where the volume loss can be ignored if only occupying a couple of percents of the total internal volume.

b
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Old 24th August 2009, 03:42 PM   #10
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Hi B, Sorry to be a pain but some more questions: The booklet that comes with the speaker says that there should be 50mm gap between the rear of the speaker and the box to allow for air movement through the hole in the magnet.? The devider going up to the sub L23 seems to stop very close to the sub. Your drawing shows lines going up to the back of the magnet. Are these flux lines? there is no mechanical piece on the speaker as indicated on the drawing? If you leave the dotted lines out, that is what the speaker looks like. Thanks for the effort, Roelof
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