Автор: TOLMACH [Владивосток] (---.xdsl.primorye.ru)
Дата: давно
Я тут совсем запутался с размерами, портами и прочим - написал производителю, который рассказывает про 10 литровыя ящики для двенашки - хохмы ради ответ публикую.
Dear Mr. ...,
Thank you for your email and for choosing HERTZ.
Concerning your enquiry, we would like to advise as follows:
Our laboratories didn't made any experimenting test to increase the box
volume of this model and therefore we can't confirm whether this is ok or
not. Generally speaking, if you increase the volume, the resonance frequency
decreases and if the volume increases in a significant way (but this is not
the case) the frequency response curve changes relevantly and rises at the
resonance frequency value.
With a 26 litre box a slight increase in the 40-50 Hz range might occur
comparing to the original frequency response of a 21litre box. This
variation is subjective and to someone it could sound agreeable while to
others it could sound annoying.
If you realize a rectangular port instead of a round port, the port section
will have to be anyway equal to the round section, and in this case the
section value will have to be equal to 52 square centimeters.
Of course you will have to calculate width and height of the rectangular
port so that, if you multiply width x height, the result is this section
value and also so that the section can actually be applied on one side of
the box.
The depth of the rectangular port will have to be equal to the depth of the
round port, that is 275 mm.
We hope this will be helpful to you and we stay at your disposal for any
further information you may need.
Best Regards,
Marta Menghini
(International Dept.)
-----Messaggio originale-----
Da: Pavel ... [mailto:pazai@mail.ru]
Inviato: martedi 27 settembre 2005 14.58
A: support@elettromedia.it
Oggetto:
Dear Elettromedia!
I am tryting to build a reflex box type enclosure with my HERTZ HX300D
(double voice coils) sub. I have heard that the 21 litre recommended is not
sufficient for such a big sub. What will happen if I build the 26 liter (vcc
= net volume, volume without the driver) enclosure with a 82@275 mm port? Iы this a good idea?
Can I replace the round, conventional bax reflex tube with the rectangular
port? What sould the length of the side of the rectangle be (comparing to 82
mm diameter tube)?
Your assitance would be greatly appreciated.
Sincerely,
PAvel ...
Vladivostok, Russia
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