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- Thread starter Brian Steele
- Start date

You can import HR files into the workbooks to get them to automatically produce the enclosure or manually input the BOXPLAN fields. However, you still have to manually input numbers into HR for a TH.

Where did you get L12 = 32.80 and L23 = 20.40?

https://www.diysubwoofers.org/sheets/

well idk i give up i dont know how i can figure out what the length is from the iddle of the cone to the middle of the cone in the boxplan i posted. i also dont know at what points the segments are broken into in the boxplan to even begin

Going by what you said middle of the cone to middle I don't see how there aren't more than 4?

Any help would be appreciated I would love to get this figured out then I could start designing my own fold patterns and stuff which would be sweeet.

Going by what you said middle of the cone to middle I don't see how there aren't more than 4?

Any help would be appreciated I would love to get this figured out then I could start designing my own fold patterns and stuff which would be sweeet.

Ok, the mouth is too big to fit in a 5 segment TH with an external depth of 38in.

With 5 segments, 6 vertical boards at 0.75in each equals 4.5in.

38in - 4.5in = 33.5in total depth internally.

In a constant flare 4 segment MTH or MTH Alternate style TH,

total internal depth = S4+S1+((S1+S1)/2)+((S4+S1)/2).

With a 5 segment MTH style TH, 1 segment (S1 to S3 or S3 to S5) needs to be a straight flare to get a rectangular shape.

Your driver, Dayton Audio HTS545HE-4 Kraken 21", has a 1,525cm2 Sd.

1,525cm2 / 3 = 508.33cm, should be your minimum number at S2.

I would model a 4 segment MTH or MTH Alternate style TH.

5 vertical boards x 0.75in = 3.75in - 38in = 34.25in internal depth.

34.75in / 2 segments (S1+S4) = 17.125in internal depth.

Your driver is 21.45in wide. I like some wiggle room and simple numbers, so I would model a 21.75in internal width enclosure.

Your driver has a 10.3" mounting depth. Again, wiggle room, simple numbers, and voice coil cooling, my mouth (S4) would be a minimum 11in.

Throat S1 = 21.75in x 2.75in x 2.54cm^2 = 385.89cm2.

Mouth S4 = 21.75in x (17.125in - 2.75in) x 2.54cm^2 = 2017.13cm2.

38in external height - (0.75in x 3 horizontal boards) = 35.75in internal height

(35.75in internal height x 2.54cm) x 4 segments = 363.22cm horn length.

The**bottom of the enclosure** internal dimensions = 14.375in (or 14 5/8") mouth + 0.75in vertical board + 2.75in throat + 0.75in vertical board + 8.5625in (or 8 9/16") + 0.75in vertical board + 8.5625in (or 8 9/16") = 36.5in.

36.5in + 1.5in (front & back boards) = 38in external depth.

(14.375in mouth - 2.75in throat) / 4 segments = 2.90625in.

The**top of the enclosure** internal dimensions = 11.46875 or (14.375in - 2.90625in) + 0.75in vertical board + 5.65625in or (2.75in + 2.90625in) + 0.75in vertical board + 5.65625in or (2.75in + 2.90625in) + 0.75in vertical board + 11.46875 or (14.375in - 2.90625in) = 36.5in.

36.5in + 1.5in (front & back boards) = 38in external depth.

With 5 segments, 6 vertical boards at 0.75in each equals 4.5in.

38in - 4.5in = 33.5in total depth internally.

In a constant flare 4 segment MTH or MTH Alternate style TH,

total internal depth = S4+S1+((S1+S1)/2)+((S4+S1)/2).

With a 5 segment MTH style TH, 1 segment (S1 to S3 or S3 to S5) needs to be a straight flare to get a rectangular shape.

Your driver, Dayton Audio HTS545HE-4 Kraken 21", has a 1,525cm2 Sd.

1,525cm2 / 3 = 508.33cm, should be your minimum number at S2.

I would model a 4 segment MTH or MTH Alternate style TH.

5 vertical boards x 0.75in = 3.75in - 38in = 34.25in internal depth.

34.75in / 2 segments (S1+S4) = 17.125in internal depth.

Your driver is 21.45in wide. I like some wiggle room and simple numbers, so I would model a 21.75in internal width enclosure.

Your driver has a 10.3" mounting depth. Again, wiggle room, simple numbers, and voice coil cooling, my mouth (S4) would be a minimum 11in.

Throat S1 = 21.75in x 2.75in x 2.54cm^2 = 385.89cm2.

Mouth S4 = 21.75in x (17.125in - 2.75in) x 2.54cm^2 = 2017.13cm2.

38in external height - (0.75in x 3 horizontal boards) = 35.75in internal height

(35.75in internal height x 2.54cm) x 4 segments = 363.22cm horn length.

The

36.5in + 1.5in (front & back boards) = 38in external depth.

(14.375in mouth - 2.75in throat) / 4 segments = 2.90625in.

The

36.5in + 1.5in (front & back boards) = 38in external depth.

Last edited:

but anywhere they are must be braced extensively.

btw, yorkville use this L shaped bracing.... on the LS608

does that have a advantage ? over just one piece of wood to brace ?

An L is stiffer and stronger than a single piece.btw, yorkville use this L shaped bracing.... on the LS608

does that have a advantage ? over just one piece of wood to brace ?

The LS608 is built of 15mm plywood, the L brace probably also makes it easier to construct using internal staple brace attachment.

In a constant flare 4 segment MTH or MTH Alternate style TH,

total internal depth = S4+S1+((S1+S1)/2)+((S4+S1)/2).

Should be:

S4+S1+((

2.5kW power in to the driver

It's 5,000 watts at 3.8ohm to hit the 21mm Xmax.

Something like this.

S4+S1+(( S4+S1)/2)+((S4+S1)/2).

The**bottom of the enclosure** internal dimensions = 14.375in (or 14 5/8") mouth + 0.75in vertical board + 2.75in throat + 0.75in vertical board + 8.5625in (or 8 9/16") + 0.75in vertical board + 8.5625in (or 8 9/16") = 36.5in.

36.5in + 1.5in (front & back boards) = 38in external depth.

(14.375in mouth - 2.75in throat) / 4 segments = 2.90625in.

The**top of the enclosure** internal dimensions = 11.46875 or (14.375in - 2.90625in) + 0.75in vertical board + 5.65625in or (2.75in + 2.90625in) + 0.75in vertical board + 5.65625in or (2.75in + 2.90625in) + 0.75in vertical board + 11.46875 or (14.375in - 2.90625in) = 36.5in.

36.5in + 1.5in (front & back boards) = 38in external depth.

S4+S1+(( S4+S1)/2)+((S4+S1)/2).

The

36.5in + 1.5in (front & back boards) = 38in external depth.

(14.375in mouth - 2.75in throat) / 4 segments = 2.90625in.

The

36.5in + 1.5in (front & back boards) = 38in external depth.

Last edited:

For constant positive flaring,

the__top left__ quadrant needs to be __bigger__ than 11.46875in

and

the__top right__ quadrant needs to __smaller__ than 11.46875in.

Same with the inner quadrants,

the**left**__ inner__ quadrant needs to be **small***er* than 5.65625in

and

the**right**__ inner__ quadrant needs to **bigg**__er__ than 5.65625in.

the

and

the

Same with the inner quadrants,

the

and

the

Last edited:

At the 39Hz excursion peak, the Dayton Audio HTS545HE-4 impedance would be higher than 3.8 ohms, so would draw less than 5000 watts at that particular frequency.It's 5,000 watts at 3.8ohm to hit the 21mm Xmax.

That said, 137.84volts, ~5,000 watts for a driver rated for only 2,000 watts (AES 426B) is considerably more than it's rating:

https://www.xlrtechs.com/dbkeele.com/PDF/Keele (2001-09 AES Preprint) - Dev. Test Signals EIA-426-B.PDF

amplifier to be connected to the loudspeaker

considered to be an “optimum” power match, as this is the most

power which can be delivered to the speaker while permitting the

speaker to operate within acceptable limits of performance as

defined by EIA in this standard under the categories of power

compression, distortion, and accelerated life testing.”

The 426-B test is specified to be done on a test baffle, the average impedance of the speaker is considerably higher than one loaded in a TH enclosure, so the power rating should be reduced accordingly.

Considering the Dayton Audio HTS545HE-4's power rating, 88volts (rather than 138 volts) should probably be considered it's maximum.

Art

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