15" sub build help

[ryanshaw3ball]

i've got a 15" ascendant audio arsenal subwoofer and i am wanting to build an enclosure to add to my HT setup. i've built several boxes for my car, all slot ported, and i'd like to do another slot port unless theres some advantage of round ports. anyone who could give me some build specs would be a huge help.

 

[annunaki]

i've got a 15" ascendant audio arsenal subwoofer and i am wanting to build an enclosure to add to my HT setup. i've built several boxes for my car, all slot ported, and i'd like to do another slot port unless theres some advantage of round ports. anyone who could give me some build specs would be a huge help.

We need the complete Theile/Small parameters for your sub to be able to offer any advice on enclosure design. A link or a copy/paste of them is very very helpful.

 

[TLS Guy]

i've got a 15" ascendant audio arsenal subwoofer and i am wanting to build an enclosure to add to my HT setup. i've built several boxes for my car, all slot ported, and i'd like to do another slot port unless theres some advantage of round ports. anyone who could give me some build specs would be a huge help.

Like a lot of car subs, it is not highly suited to HT.

If you use the ported enclosure volumes suggested by the company it does not really reach sub range for HT.

If you are prepared to live with a very large cabinet you can make it work. It will require a slot vent. The one designed has a vent air speed of 17 m/sec, which is satisfactory.

Name: Arseneal 15
Type: Standard one-way driver
Company: Ascendant Audio
No. of Drivers = 1
Fs = 27.1 Hz
Qms = 6.15
Vas = 168.9 liters
Cms = 0.181 mm/N
Mms = 188 g
Rms = 5.268 kg/s
Xmax = 18 mm
Xmech = 27 mm
P-Dia = 321.1 mm
Sd = 810 sq.cm
P-Vd = 1.458 liters
Qes = 0.53
Re = 6.7 ohms
Z = 8 ohms
BL = 20.2 Tm
Pe = 500 watts
Qts = 0.49
no = 0.612 %
1-W SPL = 89.91 dB
2.83-V SPL = 90.78 dB
-----------------------------------------
Box Properties
Name:
Type: Vented Box
Shape: Prism, square (optimum)
Vb = 9.377 cu.ft
Fb = 21.15 Hz
QL = 5.177
F3 = 22.86 Hz
Fill = minimal
No. of Vents = 1
Vent shape = rectangle
Vent ends = one flush
Hv = 3 in
Wv = 15 in
Lv = 25.01 in


You must add the driver volume, 0.2 cu. ft plus bracing and the total vent volume to Vb to get total box volume Vt.

This enclosure will go over 10 cu. ft for home HT use.

If you use a sealed enclosure F3 is over 50 Hz with very little room for Eq as xmax is almost entirely used prior to Eq.

Use of that driver can only be recommended for home HT with a very large enclosure, which may not be practical for your situation.

 

[ryanshaw3ball]

i have quite a bit of room but i was thinking 6-7 cu ft would be sufficient for a 15" driver. i've heard a lot of people in the car audio world transforming ascendant drivers into HT use and having very good results. if 10 cu ft is necessary then i can do it but i'd rather do a little smaller unless that will dramatically affect the performance

 

[lsiberian]

i have quite a bit of room but i was thinking 6-7 cu ft would be sufficient for a 15" driver. i've heard a lot of people in the car audio world transforming ascendant drivers into HT use and having very good results. if 10 cu ft is necessary then i can do it but i'd rather do a little smaller unless that will dramatically affect the performance

Only extension. If you're willing to give up extension for size then sometimes you can reduce the size of the enclosure. I'll let TLS check and see if it's plausible.

 

[TLS Guy]

i have quite a bit of room but i was thinking 6-7 cu ft would be sufficient for a 15" driver. i've heard a lot of people in the car audio world transforming ascendant drivers into HT use and having very good results. if 10 cu ft is necessary then i can do it but i'd rather do a little smaller unless that will dramatically affect the performance

Isiberian is correct, you loose a bit of bass extension. At 7 cu. ft your F3 is 27.

By the time you add driver, port, and bracing it will end up around 8 cu.ft. I think that is a small as you can make that driver for HT. Despite size it makes a really good sub.

Name: Arseneal 15
Type: Standard one-way driver
Company: Ascendant Audio
No. of Drivers = 1
Fs = 27.1 Hz
Qms = 6.15
Vas = 168.9 liters
Cms = 0.181 mm/N
Mms = 188 g
Rms = 5.268 kg/s
Xmax = 18 mm
Xmech = 27 mm
P-Dia = 321.1 mm
Sd = 810 sq.cm
P-Vd = 1.458 liters
Qes = 0.53
Re = 6.7 ohms
Z = 8 ohms
BL = 20.2 Tm
Pe = 500 watts
Qts = 0.49
no = 0.612 %
1-W SPL = 89.91 dB
2.83-V SPL = 90.78 dB
-----------------------------------------
Box Properties
Name:
Type: Vented Box
Shape: Prism, square (optimum)
Vb = 7 cu.ft
Fb = 21.15 Hz
QL = 5.177
F3 = 27.01 Hz
Fill = minimal
No. of Vents = 1
Vent shape = rectangle
Vent ends = one flush
Hv = 2.5 in
Wv = 15 in
Lv = 29.16 in

 

[ryanshaw3ball]

well it's used probably 80% for music so i dont need extension below 28 hz too much. i just dont want a boomy response, and i'd love that good low end music extension around 35hz in hip hop and r&b songs.

as for the build, i was looking at a 30x30x24" WxHxD, with a 3" rear facing slot port and down firing sub. slot port length of 33.5" and total port area of 85 sq" with a tuning frequency of 25hz and a final volume of just under 9 cu ft.

does this sound about right?

 

[TLS Guy]

well it's used probably 80% for music so i dont need extension below 28 hz too much. i just dont want a boomy response, and i'd love that good low end music extension around 35hz in hip hop and r&b songs.

as for the build, i was looking at a 30x30x24" WxHxD, with a 3" rear facing slot port and down firing sub. slot port length of 33.5" and total port area of 85 sq" with a tuning frequency of 25hz and a final volume of just under 9 cu ft.

does this sound about right?

That's right between the two models I gave you. Sounds about right to me.

 

[lsiberian]

well it's used probably 80% for music so i dont need extension below 28 hz too much. i just dont want a boomy response, and i'd love that good low end music extension around 35hz in hip hop and r&b songs.

as for the build, i was looking at a 30x30x24" WxHxD, with a 3" rear facing slot port and down firing sub. slot port length of 33.5" and total port area of 85 sq" with a tuning frequency of 25hz and a final volume of just under 9 cu ft.

does this sound about right?

Placement has a great effect on boominess so make sure you try a few spots.