- Thread Starter
- #161
Two identical passive radiators, maybe one needs a tiny bit of mass to stop the mutual resonance?
Or was it something loose..
The latter
Two identical passive radiators, maybe one needs a tiny bit of mass to stop the mutual resonance?
Or was it something loose..
Damn, below 0.1% THD above ~150Hz besides that noted 350Hz region. That’s awesome.
EDIT: And below ~0.3% (-50dB) above ~90abs for 96dB. That’s crazy.
Sorry for being a dummy but my science knowledge is limited to enterprise networking not acoustics and sound waves. I’d like to know how they compare to Kef R3 and Revel M105 given there’s a price premium to these ones. I have kef ls50s and am figuring out my upgrade speakers to make better use of my March Audio P452. Thanks!
Thank you for the kind words.@March Audio , excellent implementation.
I’m wondering if a waveguided tweeter (see Hificompass) would have helped in keeping constant directivity.
I’m also wondering about composite materials instead of wood.
I’m also curious on crossover, since passive, is it 12 or 24dB/octave ? (I assume air core and quality caps are a must...) a picture would be nice.
what about a 6.5 woofer in the back one on the side and a 4” in the front? With active and dsp you can do some cardioid bass helping room integration.. same concept than Kii.
however purifi is the best 6.5“ today and Bliesma with Viawave is topping any tweeter ranking.
Fantastic drivers quality at a “very good price point”. if you manage to produce it in quantity you have a killer product.
congratulations
my Best
L.
They used the 25mm version. This uses the 34mm version, so it can handle the lower crossover on its own.I’m wondering if a waveguided tweeter (see Hificompass) would have helped in keeping constant directivity.
Due to the tweeter being capable of very low frequencies (1.3kHz) a wave guide isnt required to match the directivity at crossover.
Hope you understand Im not going to talk in too much detail about the xo
Sorry, not going to share everything hope you understand. Polar plot has been posted. You can also see the effect in the predicted in room plot that was posted.Can you share horizontal frequency response measurements from deg0-90 with us?
Especially with a low crossover frequency of the Bliesma 34mm I would expect a significant widening in the radiation in the range 2-5kHz. I am curious how you solved the problem.
A high crossover frequency with low order should counteract this a little bit, but this results in worse vertical radiation and higher IMD due to Doppler effects (at high sound pressure levels in the low frequency range).
I’m not concerned about low crossover point. also klipsch and Kii audio cross around 1.5 but use waveguide to control directivity. Better to narrow the tweeter at 1.5 to match its directivity at higher frequency. Do you agree?They used the 25mm version. This uses the 34mm version, so it can handle the lower crossover on its own.
The woofer has wide directivity as the crossover point though.I’m not concerned about low crossover point. also klipsch and Kii audio cross around 1.5 but use waveguide to control directivity. Better to narrow the tweeter at 1.5 to match its directivity at higher frequency. Do you agree?
I’m not concerned about low crossover point. also klipsch and Kii audio cross around 1.5 but use waveguide to control directivity. Better to narrow the tweeter at 1.5 to match its directivity at higher frequency. Do you agree?
The woofer has wide directivity as the crossover point though.
Yes we know that, but this is entirely intended to be a "classic" passive design aimed at a certain part of the market.that's why clever design address woofer directivity properly, not only tweeter. to name few:
-Grimm LS1 wide baffle to narrow directivity down to 300Hz
-Dutch & Dutch with side opening (similar to open baffle)
-Kii three with DSP cancelling down to 50Hz rear and lateral radiation
the rest of the world is to me "classic" design controlling only the upper half of the frequency spectrum leaving the bass, low mid and mid uncontrolled, at the mercy of the room.
if you look at impulse response you will see how much early floor, sidewalls and ceiling reflections can affect timing perception (imaging) and mask the attack of instruments... but this is another chapter.
my Best
Yes we know that, but this is a "classic" design
Which is why it doesn't cost many times as much
As the spectrograms in VituixCAD do not show stepped color with 3dB steps, there are basically no details visible.Sorry, not going to share everything hope you understand. Polar plot has been posted. You can also see the effect in the predicted in room plot that was posted.
I think this is clear to everyone, with a "typical" loudspeaker cabinet (and without waveguide) nobody is able to achieve perfect directivity. It doesn't have to be, with good tuning it can still sound excellent.As mentioned previously the sound power isn't perfect 2 to 6 kHz, but its not leading to any significant issues for the in room response or audible issues.
As the spectrograms in VituixCAD do not show stepped color with 3dB steps, there are basically no details visible.
Can you show the spectrogram with contour lines activated (this would increase the interpretation significantly) and for comparison also the spectrogram normalized to the axis frequency response?
I think this is clear to everyone, with a "typical" loudspeaker cabinet (and without waveguide) nobody is able to achieve perfect directivity. It doesn't have to be, with good tuning it can still sound excellent.
I would use the deg0-90 frequency response measurements to compare them with a simulation of the loudspeaker to simply gain more experience in evaluating the used simulation-software.