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

Wharfedale Diamond 11.2 Speakers

Jeanpher

Member
Joined
Nov 24, 2015
Messages
55
Points
8
Location
Bangalore
Hello All,

I am planning to build a subwoofer with DA SD270A-88 10''. I have simulated the box with WINISD pro. It gives good frequency response in large box. I dont have that much room for it. I am expecting it to be under 2 cubic foot with tuning frequency under 30hz. Could someone help me with vented box enclosure size.

Thanks and Regards
Jeanpher
 

prateekatasniya

Well-Known Member
Joined
Oct 27, 2016
Messages
1,139
Points
83
Location
Hyderabad
Hello All,

I am planning to build a subwoofer with DA SD270A-88 10''. I have simulated the box with WINISD pro. It gives good frequency response in large box. I dont have that much room for it. I am expecting it to be under 2 cubic foot with tuning frequency under 30hz. Could someone help me with vented box enclosure size.

Thanks and Regards
Jeanpher
Did you buy the driver?
 

Jeanpher

Member
Joined
Nov 24, 2015
Messages
55
Points
8
Location
Bangalore
Hello All,

I have run the driver parameters and calculated enclosure properties. I have attached the file please go through it and tell me if I am missing something. Thanks in advance for your valuable inputs.

Regards
Jean
 

Attachments

raghupb

Well-Known Member
Joined
Sep 11, 2015
Messages
2,162
Points
113
Location
Bengaluru
Hello All,

I am planning to build a subwoofer with DA SD270A-88 10''. I have simulated the box with WINISD pro. It gives good frequency response in large box. I dont have that much room for it. I am expecting it to be under 2 cubic foot with tuning frequency under 30hz. Could someone help me with vented box enclosure size.

Thanks and Regards
Jeanpher
Hey Jean,
After a long time, eh? Good luck on your build.

Cheers,
Raghu
 

diyaudio

Active Member
Joined
Apr 6, 2018
Messages
176
Points
43
Location
India
For similar price there are better ways of building a sub. Take, 12" (or 10") JBL car drivers, 2 of them. Put them on opposite side of the enclosure about 1.5 cu ft. Either port it or PR it.
To measure the tuning frequency of port or PR, take a sound card, say Behringer 222, and see the impedance curve.
You can take 2 of 12" passive radiators (or make them) and put on the remaining 2 sides of the box. Take a decent 400 watts + amp, pro grade would be better.
This sub has greatest bang for the buck. Everything available locally.
It has larger surface area, greater excursion capability, greater heat dissipation ability, better dynamics and lower distortion, quite small box for the performance.
 

kapvin

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Joined
Jul 23, 2009
Messages
1,110
Points
83
Location
Mumbai/ Thane
Are car sub drivers suitable for home theater purpose? Wouldnt they be boomy
They can be. The cheaper ones tend to have high Qts which can cause one note bass if not tuned properly. But may car subs are very tight (alpine R series come to mind), but optimised to car cabin gain.

At the budget end the infinity 1242 was reputed to do very well in a moderate enclousure. there was a lot buzz about it on diyaudio a few years back. I personally had a pair of JBL GT-5 which could dig really low in 60 litres.

but coming to OP, thats a really big box for 10". you do have the option of a smaller, box and a lower tuning frequency, so that will be a sloping response (which could be compensated by corner loading)but at least your driver wont unload (bad!) in most cases. of course as you tune lower, vent volume plays a role so at some point you end up with vent dominating the box build. Your best bet would be to use a Passive radiator.

Best wishes
 

diyaudio

Active Member
Joined
Apr 6, 2018
Messages
176
Points
43
Location
India
Are car sub drivers suitable for home theater purpose? Wouldnt they be boomy
Reputed ones like JBL/Pioneer have Qts lesser than 0.5 (my pioneer has 0.35 as measured), they even have low Vas and moderate Fs (Mms). All good things. I dont really understand the real need to use other hard to find ones.
Boomy/Tight is not about driver, its about setup. An excellent sub may sound boomy or tight depending on setup.
 
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