My first DIY Subwoofer using Dayton Audio SD270A-88 10''

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jeanpher

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Joined 2020
#1
Hello All,

I am new to this forum, I have seen so much knowledge has been shared in this forum in DIY stuff. I am planning to build a subwoofer with DA SD270A-88 10''. I have simulated the box with bass box pro. I have run the driver parameters and calculated enclosure properties. I have attached the file too please go through it and tell me if I am missing something. Thanks in advance for your valuable inputs.

I chose vented enclosure, I have seen some old thread related to the same driver but information are not complete, feel free to suggest me with different type of enclosure.

As I am new to DIY, please bear with my overnight knowledge.

Regards
Jeanpher
 

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#3
I will give a look in my computer and check for options. So you are set with this driver. Do you measured new T/S parameters or just factory?
Edit: is a good driver for sealed (or quarter wave). In the case of a reflex reference alignment:
DAYTON SD270A-88 DVC, VB = 112.6 L, FB = 19.3 Hz
You need a smaller enclosure will give higher Q what should be fine. I will check with the NET volume in your paper next.
2ft³= 56.63369L
 
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#4
DAYTON SD270A-88 DVC, VB = 56.0 L, FB = 25.4 Hz
(Note: the NET volume doesn't include the port.)
Port: 11.8 cm/81.7 cm (d/L)
Diam. of the port is configured for 80W. If you use less on a daily base (relax listening) it can be of a smaller size (d).
 

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#5
Do you have a port diameter of your choice? Let's say we make a compromise of smaller diameter/lenght and power and different alignments, you to decide.
DAYTON SD270A-88 DVC, VB = 56.0 L, FB = 28.0 Hz
Port: 9.4 cm/40.3 cm (d/L)

Note: in your Bass box pro paper you ask about air velocity about 19 m/s usually for max power (80W in this case) we generally have =<13.7 m/s.
 
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#6
tikiroo said:
But the low Xmax is a constraint. I guess it depends on whether you want to maximise SPL or LF extension.
Click to expand...

+1 Need to know or how biased to one or the other plus in room placement to be able to intelligently critique, suggest other options such as optimum box size vs LF gain BW = [measured] Vas/1.44 tuned to actual Fs, which is generally best overall for small Xmas drivers.

GM
 
#7
Inductor said:
I will give a look in my computer and check for options. So you are set with this driver. Do you measured new T/S parameters or just factory?
Edit: is a good driver for sealed (or quarter wave). In the case of a reflex reference alignment:
DAYTON SD270A-88 DVC, VB = 112.6 L, FB = 19.3 Hz
You need a smaller enclosure will give higher Q what should be fine. I will check with the NET volume in your paper next.
2ft³= 56.63369L
Click to expand...

Inductor said:
DAYTON SD270A-88 DVC, VB = 56.0 L, FB = 25.4 Hz
(Note: the NET volume doesn't include the port.)
Port: 11.8 cm/81.7 cm (d/L)
Diam. of the port is configured for 80W. If you use less on a daily base (relax listening) it can be of a smaller size (d).
Click to expand...

Inductor said:
Do you have a port diameter of your choice? Let's say we make a compromise of smaller diameter/lenght and power and different alignments, you to decide.
DAYTON SD270A-88 DVC, VB = 56.0 L, FB = 28.0 Hz
Port: 9.4 cm/40.3 cm (d/L)

Note: in your Bass box pro paper you ask about air velocity about 19 m/s usually for max power (80W in this case) we generally have =<13.7 m/s.
Click to expand...

Hi Inductor, Thank you for your valuable time, I have been waiting for your comments.

"Are you set with a driver?" I am confused because after running 2 weeks simulating this driver, I am not able to get a good convincing enclosure for it. First of all simulators suggest a bigger enclosure which is impractical to build, then If I reduce the size, either I am not getting LF or exceeding cone excursion. Even If I solve these, it suggests a port with impossible length. It seems this driver needs more than average knowledge in DIY to build it.

So thinking of alternative drivers, below are the drivers which are available in my place. From your experience, can you tell any of these drivers can be easily built with my limited knowledge on DIY.

Tang Band W8-740P 8" Subwoofer

Tang Band WQ-760C 12" Paper Sub woofer

Dayton Audio - SD215A-88 - 8" DVC Subwoofer

Tang Band W6-1139SIF 6-1/2" Paper Cone Subwoofer Speaker

My requirements are that I have a floor stander (Paradigm 11) which can take care of frequencies above 50 hz, So I am planning to build a subwoofer which takes care below frequency upto 20 hz at least 25 hz considering the room gain.

or

If my above requirement is possible with the current driver, I am happy to do it, please suggest me an enclosure and port d/L.

As this is my first build, I was especially looking for a completed build which I can copy and learn things in my first DIY. Unfortunately I was not able to get any build for these drivers.

Excuse me for the big message.
 
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#8
Very interesting sealed applications for accurate HiFi with 12" and 40 or 56L enclosure as follows.

1. 12" TANG BAND WQ-760C, VB = 56.0 L, Fc = 40.4 Hz, Qtc = 0.637, 91.2 dB/2.83V/m
F12 dB - 21.1 Hz, Power 31.1 W/3.2 Ohms (Xmax)
Total: 102.1 dB SPL

2. 12" TANG BAND WQ-760C, VB = 40.0 L, Fc = 45.2 Hz, Qtc = 0.713, 91.2 dB/2.83V/m
F12 dB - 22.9 Hz, Power 48.7 W/3.2 Ohms (Xmax)
Total: 104.1 dB SPL

BR applications more interesting for HT with 12" (large box) and 8" with internal ~35L:

3. 12" TANG BAND WQ-760C, VB = 66.5 L, FB = 21.5 Hz, 91.2 dB/2.83V/m
F12 dB - 17 Hz, Power 164.8 W/3.9 Ohms/21.5 Hz (Xmax ± 6.00 mm)
PORTS: 3x Ports = 5.7 cm/69.4 cm (D/L) or the same area of port 76.55 cm2
Total: 110.2 dB

4. 8" DAYTON SD215A-88, VB = 30.6 L, FB = 25.4 Hz, 89.5 dB/2.83V/m
F12 dB - 20 Hz, Power 77.8 W/3.8 Ohms/25.4 Hz (Xmax ± 5.57 mm)
PORTS: 1x Port = 7.4 cm/59.6 cm (D/L) or for the same area of port 43.01 cm2
Total: 105.2 dB SPL
😉
 
#10
Inductor said:
Very interesting sealed applications for accurate HiFi with 12" and 40 or 56L enclosure as follows.

1. 12" TANG BAND WQ-760C, VB = 56.0 L, Fc = 40.4 Hz, Qtc = 0.637, 91.2 dB/2.83V/m
F12 dB - 21.1 Hz, Power 31.1 W/3.2 Ohms (Xmax)
Total: 102.1 dB SPL

2. 12" TANG BAND WQ-760C, VB = 40.0 L, Fc = 45.2 Hz, Qtc = 0.713, 91.2 dB/2.83V/m
F12 dB - 22.9 Hz, Power 48.7 W/3.2 Ohms (Xmax)
Total: 104.1 dB SPL

BR applications more interesting for HT with 12" (large box) and 8" with internal ~35L:

3. 12" TANG BAND WQ-760C, VB = 66.5 L, FB = 21.5 Hz, 91.2 dB/2.83V/m
F12 dB - 17 Hz, Power 164.8 W/3.9 Ohms/21.5 Hz (Xmax ± 6.00 mm)
PORTS: 3x Ports = 5.7 cm/69.4 cm (D/L) or the same area of port 76.55 cm2
Total: 110.2 dB

4. 8" DAYTON SD215A-88, VB = 30.6 L, FB = 25.4 Hz, 89.5 dB/2.83V/m
F12 dB - 20 Hz, Power 77.8 W/3.8 Ohms/25.4 Hz (Xmax ± 5.57 mm)
PORTS: 1x Port = 7.4 cm/59.6 cm (D/L) or for the same area of port 43.01 cm2
Total: 105.2 dB SPL
😉
Click to expand...

Inductor said:
DIY Build links @PE tech-talk-forum:
Building a cheap computer sub: Dayton SD215-88
Dayton Sd215A-88 Exceeds Expectations (so far)
Toucan (Dayton SD215A-88 Bandpass Subwoofer)
YouTube video Making A Powered Sub Woofer - High Quality Bass - DIY Speaker - YouTube
Click to expand...

Thank you so much for your time. You have given me a variety of options. I am working on it. As soon as I start my build I will update with the choice I made.

Thanks again, Have a nice day.

Regards
Jeanpher
 
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