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Date: April 12, 2002 at 06:06:10
From: OTor, [inetgw.fcc.cz]
Subject: Ask for your opinion


Hi there!

I have built a lot of DIY speakers, in general
full rangers with 4” to 12” drivers, and never built one SW.
So this is my first attempt and my target is to have an
excellent bass reproduction to meet my fullrangers.

After a lot of reading, I decided to not build
a bass horn (:-) and I am focused to something
not very huge but big enough to produce a good bass.

The woofer I selected is Beyma pro driver:
Beyma 15k200, 15"
fs 27 Hz
Re 6.3 ohms
Qms 9.01
Qes 0.272
Qts 0.264
Vas 345 L (12.2 ft3)
no 2.5 % / 98 dB/W/m
Sd 0.088 m2
Xmax 7.5 mm (0.3")
Le 1.7 mH
BL 20.5
Pe 300W

U used some free software to do simulations
(win ISD, BOXPlot, ....) and what looks cool
on my monitor is the BR box as follows:

Vb = 125 l (4.41 ft3)
Fs = 23 Hz

when equalized (2ord EQ, F=23Hz, Damping = 0.507), it gives
-3dB@50Hz, max SPL 117dB
-5dB@28Hz, max SPL 110dB
-13dB@20Hz, max SPL 105dB
power limitation due to Xmax excursion and Equalization is
75W@25Hz,
200W@50Hz,

... thanks for reading all this details :)

Now my question is
-> is any misunderstanding of principles in this design ?
-> will this perform well as one subwoofer for a domestic use
in 15x25ft room ?
-> and also what power amp will I need for a "normal" listening
level (HIFI use, classical music) ?

& a special question: do you have un idea what another
alignment could I use with this woofer (TLM, TQWT, ...?)

Thanks in advance,
Otor


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