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#11 |
diyAudio Member
Join Date: Nov 2005
Location: alsace
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I really don't see where you guess a problem.
You say 0.3% THD at 100/105db is respectable...I would say it's uncommon with non horned drivers! And where is the problem with +/-2db on a small fr range right before uppermid? Personally, if I had a doubt with this design it would be in the field of the off-axis energy in the uppermid because cutting a 145cm2 SD near 2Khz isn't quite ideal. With such a SD, nondirectional piston range begins close to 800Hz. About the inner shape of the mid enclosure, sure such small bumps and valleys have less than an effect but the global shape has no // walls and this helps reducing standing waves. Just my 2 cents. ![]()
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crazyhub |
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#12 |
diyAudio Member
Join Date: Sep 2002
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Well the problem might be that the driver has increased distortion around 1k and that indicates something is going on. Yes the driver is a good one but hey, let's strive for perfection okay?
![]() There are some drivers that perform equally good or better in part of the range, even non horn loaded drivers. Wether the increase in distortion is a problem or not is hard to say of course without an in depth investigation of the driver. However if the distortion is of a type that is not increasing gradually but instead suddenly shows up, then the audibility might be worse..and such distortion is also often plauged with higher order harmonics. The problem with +/-2dB ripple in a small range.. well it indicates once again that something is going on that shouldn't be there. It's just to much of a deviation from the raw respons of the driver indicating (likely) stored energy and/or difraction not dealth with sufficiently. The enclosure will more or less behave as there is a back wall. Standing waves does not dissapear just because the shape is altered from a cube. ![]() /Peter |
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#13 | |||||||
diyAudio Member
Join Date: Nov 2005
Location: alsace
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crazyhub |
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