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My first speaker
A while ago I decided to build my own bluetooth/wifi speakers. Therefore I bought 2 drivers and 2 passive radiators.
* Tang Band (https://loudspeakerdatabase.com/TangBand/W8-2314)
* Purifi Audio PTT8.0PR-NA2-01 (https://ptt.purifi-audio.com/shop/ptt8-0pr-na2-01-ptt8-0pr-na2-01-1746?attrib=442-8512&attrib=346-8074#attr=7014,7013,7015,7016,7024,7017,7018,7019,7020,7021,7022,7023,7025,7026,7027,7028,7029,7030,7031)
Using 2 Arylic Plate Amp 2.1, I want to build 2 separate wireless speakers. Note that I have done measurements on the two drivers with my DATS v3 (see below). I guess the next step is to build a test box, and I also guess that I should use my measurements to determine the size of the test box, but how would I go about this?
Having read an article on enclosure design (https://audiojudgement.com/passive-radiator-speaker-design/) I’m left confused since some assumptions are made in this article, which might not be true for my project (like beta = alpha, Qts is between 0.2, and 0.35, etc.) As mentioned, I’m not sure if I can make all these assumptions, but the main question would be: how do I make a good test box?
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2 Replies
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Here are my measurements
Woofer 1:* Piston Diameter = 180 mm
* f(s)= 44.95 Hz
* R(e)= 3.7 Ohms
* Z(max)= 17.17 Ohms
* Q(ms)= 2.292
* Q(es)= 0.6294
* Q(ts)= 0.4938
* V(as)= 40.36 liters (1.425 cubic feet)
* L(e)= 0.7655 mH
* n(0)= 0.5553 %
* SPL= 89.55 1W/1m
* M(ms)= 28.25 grams
* C(ms)= 0.444 mm/N
* BL= 6.848
* K(r)= 0.2868
* X(r)= 0.3744
* K(i)= 0.07163
* X(i)= 0.4827
Woofer 2:
* Piston Diameter = 180 mm
* f(s)= 50.77 Hz
* R(e)= 3.783 Ohms
* Z(max)= 18.1 Ohms
* Q(ms)= 2.557
* Q(es)= 0.676
* Q(ts)= 0.5347
* V(as)= 33.1 liters (1.169 cubic feet)
* L(e)= 0.7905 mH
* n(0)= 0.6111 %
* SPL= 89.96 1W/1m
* M(ms)= 27 grams
* C(ms)= 0.364 mm/N
* BL= 6.943
* K(r)= 0.2942
* X(r)= 0.3743
* K(i)= 0.05923
* X(i)= 0.5023
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What are your concerns with the test box? I would first simulate it in WinISD to see what your results are. Often that will be more than enough to figure out if you should build a test box.