If the frist squiggle line is k2, then it's not below 1%, it at about -35dB, so around 1.8% actually. Now that doesn't mean it's bad because we don't know the actual level..
Here is a plot of a HF146 on XT1464 with correctly marked levels:
That is at about -40dB at 105dB, which is about 1% even down to 500Hz. That is not to shabby for home usage I'd say.
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(not an expert so more advice is alway welcome!)
The LF is a 2226h in a 120-130L BR tuned around 38hz. Doing the CAD design at the moment and waiting for the LF delivery (in like a month...).
I though that its better to keep Ohms to 8 as its the easiest for most apms to drive (including a little tube for example), I might be wrong thought.
Cen you elaborate on the pat down? Will some attenuation get the impedance to half?
thanks
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You have to look at the HD scale when you interpret that graph.
No - that is not too bad and it is actually the driver that I am using. Although the HF144 should be a little better in this respect according to what I have read. But the HF146 is a bit more linear from the frequency response POV.
Regards
Charles
I love this driver, especially the 4592 dedicated mid driver. In the right horn and well designed crossover, it is super smooth and has incredible midrange detail and clarity.
If the 29 degree exit is as they say, this would change the face of waveguide needs for this driver.
My comments wrt the BMS were a bit harsh.
For lower SPLs at home, the reported distortion is problably less problematic.
I mostly buy drivers with an excellent reputation among pro users.
While I have little doubt the DCX464 will beat the BMS coaxials, it's still a (compromised) product developed with specific PA applications in mind, for which high output and portability are major design considerations.
This BI-AMPED LINE ARRAY 1600W + 640W - 147 DB SPL (PEAK) is such a product:
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Hmm, maybe not ideal, but I would hope that what's important can transcend this limitation..
Up to about 10 degrees variance in exit angles with a slow flaring horn doesn't make much difference.
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SETs and other low power tube amps like higher impedances.
You'll need KT88s and similar heavyweights to breath life into typical PA woofers such as the 2226.
A 15PR400 is the better option for low power tube amps.
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Sorry, i was aware that a small phase issue is inaudible at such frequencies
But i've never read that the treble distortion is caused by the waves diffraction in the gap between the throat and the phase plug, and that issue is unavoidable... is my assertion right ?
This is certainly true with vintage drivers with Altec finally addressing it somewhat with the Tangerine phase plug, showing the biggest improvement with its 1.4" 299A, though even the 1" 802-8G is noticeably 'sweeter' up top according to those folks with far better HF hearing than me. Note that damping with 4/0 stainless steel wool in the front chamber helps too.
GM
The whool is reflecting the HF waves, and the HF wavelengths seems to be shorter than the phase plug (sharp angled) slots, no ?
It should depends of the wavefront frequency that you are talking about, LF frequencies are not so easy to distort
The whool is reflecting the HF waves, and the HF wavelengths seems to be shorter than the phase plug (sharp angled) slots, no ?
It should depends of the wavefront frequency that you are talking about, LF frequencies are not so easy to distort
These LF are not the wavelengths we're dealing with here.
The issues referred to are dependent on:
- SPL
- type of signal > music with dense/complex midrange is problematic.
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If you make your coax big enough, You can deal with LF, especially at low SPL levels.