|25th February 2008, 11:14 PM||#11|
Join Date: Mar 2006
Of course, there should be some difference in power handling if you compared 40 Hz Fb in 20 liters to 50 Hz Fb in 14 liters. But as your sim shows, in this case, there should also be a significant difference in the bass rolloff. Depending on the speaker placement, 50 Hz Fb in a 14 liter box can sound boomy due to the midbass peak. Using a Zobel circuit and a lower DCR iron core will mitigate the problem a bit. My sim assumed .4 ohm series resistance and Zaph's T/S measurements were used.
|26th February 2008, 11:45 AM||#12|
Thanks for all of the options, I will have to ponder this some more.
In regards o BSC, I was thinking 3 dB, but since they will be sitting on a bureaus, next to a wall, would no BSC be appropriate?
|4th March 2008, 02:23 PM||#13|
diyAudio Member RIP
Join Date: Nov 2003
Location: Brighton UK
According to Zaph no BSC is hardely ever appropriate, usually this
means corner or corner & ceiling placement and you have thrown
away most of the the ability for the speaker to sound good.
Zaph's reduced BSC versions do not reduce it by much.
Also FWIW I'd say maximum tuning frequency of a vented box should
be around 44Hz, bottom E on a bass, but the lower the better IMO,
around 31Hz, bottom B on a piano is preferable, if possible IMO.
Another FWIW is that Vas is a small signal phenomena and for large
signals it is anything but linear, causing odd harmonic distortion, any
assymetry causes even harmonic distortion. There are other issues
e.g. voice coil offset etc. to also consider......
Conversely the air in the box is comparatively extremely linear and
the more this dominates the more linear the speaker is by default.
A 15L vented box should have a suitable driver with a Vas of around
30L for clean bass, such a driver (usually 6.5") will be far superior
in the bass end than a lower Vas driver, for the reasons given.
Vas = 12L and Qts = 0.45 is more workable than 8L and 0.6.
Fs ? lower due to higher Vas ? guesstimate = 45Hz.
for 15L best tuning frequency = 33Hz IM0, max IM0 37Hz.
(Using WinISDbeta, not as accurate as Unibox)
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