OP
- Thread Starter
- #281
Grills are a bad idea from an acoustic POV, just causes diffraction. So not planning them as standard.
However if its something a customer wants we can certainly manufacture some.
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March Audio Sointuva Speaker
- Thread starter March Audio
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However if its something a customer wants we can certainly manufacture some.
OP
- Thread Starter
- #282
Grills are a challenge with these drivers due to the surround design and massive excursion.Agreed.
I don’t know how a typical grille would fit on this speaker though. More expensive (I assume), but a plastic grille just on the woofer like my Wharfedale’s use would likely be a deciding factor for some that just hate the look of the Purifi’s surround:
It’s not magnetic, put fits into the screws.
Once you see them in action the surrounds are fascinating to watch
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Grills are a challenge with these drivers due to the surround design and massive excursion.
Once you see them in action the surrounds are fascinating to watch
They do almost come alive when playing, so I see what you mean. I suppose a blind fold would be a pragmatic and cheap solution.
I’m sure that I can find an audiophile company to sell me a cheap bit of suitable fabric for a couple of hundred pounds.
Mind you, I’m saving my money for the March audio phono preamp. Do you see what I did then Alan, subtle eh?
OP
- Thread Starter
- #285
The pre amp is the next project, some months off yet.Mind you, I’m saving my money for the March audio phono preamp. Do you see what I did then Alan, subtle eh?
Okay, to be fair to the other manufacturers discussed here in the forum, one should realistically evaluate the measured values.
The distortion measurements are really excellent (especially in the low bass range) if the problem is eliminated around 350Hz.
The cabinet design is a classic 2-way concept with the woofer and tweeter showing very different directivity characteristics.
The tweeter has an extremely wide dispersion due to its construction and dome properties.
The 6.5'' woofer, on the other hand, shows clear directionality in the radiation (in combination with the cabinet) already from 800Hz.
This leads to a somewhat uneven radiation pattern of the loudspeaker. The crossover compensates the uneven radiation pattern only slightly, which is shown in the measurements:
The dip in PIR, PR,... in the frequency range 0.8-1.8kHz is of course partly caused by the crossover (if the crossover frequency is around 1.3kHz as mentioned) and can never be avoided completely (with a classic 2-way concept), and in this case overlaps with the already narrow radiating woofer (in comparison to the tweeter).
The extremely wide radiation of the tweeter (in combination with the loudspeaker baffle) then shows up in the widening of the radiation in the frequency range 2-5kHz (see DI), but which is partially compensated in the range of 3-5kHz by a dip in the axis frequency response.
Guess that the loudspeaker can be easily adjusted via EQ due to the good chassis quality and even radiation of the individual drivers (this can finally be estimated when the normalized hor and ver FR are available).
OP
- Thread Starter
- #287
Yes agree with the comments, as already mentioned its not perfect, but as you previously said yourself, it doesn't need to be
. The deviations are actually fairly small. Its not having any significant subjective effect in the testing performed so far. Plus the fact that I will no doubt make a few more subtle xo tweaks
Speaker design is always a compromise, the trick is to make the compromises that have the least negative subjective effect.
The speakers will be going out to a range of people for subjective evaluation and feedback
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westyjeff
Active Member
I want to be added to this list!!
OP
- Thread Starter
- #289
That depends on how far away you are
You are correct, but this is about as much as you can expect with baffle mounted radiators. Now, if we switched out the Bliesma for the wavecor or SB waveguide units we'd have something. Having said that, in the context of audiophile 2 way speakers, this is pretty good. Slight directivity issue without sharp discontinuities, a slight recess around the crossover region in the reverberant response.
I'm assuming these are c. second order crossovers, I'm not sure why you'd do anything steeper with these drivers.
tjkadar
Member
That depends on how far away you are
Too far for me... plus, my only subjective input would be *drooolllllssss*
jonm42
Member
If they would let me into Oz, I'd be there in a heartbeat. I'm not sure if being from the US currently disqualifies me from entry to WA or not. Alan, could you put in a good word to help a mate out?
westyjeff
Active Member
That depends on how far away you are
DHL did a good job getting the P701's to me, I'm sure they could handle a pair of these!!
I just try to dampen the euphoria to a realistic level and to be equally critical of all manufacturersYes agree with the comments, as already mentioned its not perfect, but as you said yourself, it doesn't need to be
Yep, with a good crossover tuning a loudspeaker doesn't necessarily have to radiate optimally evenly to sound good. As @617 already said
are good conditions for it to work.
Agree with both of you regarding the very classic loudspeaker design.
If you replace the 6.5'' woofer with two 4'' woofers and bevel the cabinet, you can achieve really good directivity, even with the Bliesma tweeter.
If the TW030WA11 is integrated with a high crossover frequency and a second order filter, the radiation should harmonize quite well with the 6.5'' woofer - but it is only an assumption, I have not simulated it.
I gotta pipe up here about grilles. I really prefer the old school look of speakers with full grills. If sidewards radiation is controlled I don't think diffraction is a big deal.
For this speaker though, you have to show off the drivers. They look as fancy as they are.
For this speaker though, you have to show off the drivers. They look as fancy as they are.
OP
Then use badly framed grilles.
restorer-john
Grand Contributor
Send me one, or preferably a pair. I'll pay return freight. Put them up against at least 20 pairs of speakers on a wide variety of source gear, level matched, on my Technics comparator.
I could run them against NS-1000Ms, small and big Infinities, B&Ws, Jamos, Sonys, Wharfedale, Dali, Missions, Energy, even a few vintage JBLs, Dynaudios and Mirages. I can even take them to my friend's place and compare them to his Wilson Audio Sascha IIs or his (small) Harbeths driven by his Gryphon Diablo.
OP
- Thread Starter
- #300
I think we can arrange for thisSend me one, or preferably a pair. I'll pay return freight. Put them up against at least 20 pairs of speakers on a wide variety of source gear, level matched, on my Technics comparator.
I could run them against NS-1000Ms, small and big Infinities, B&Ws, Jamos, Sonys, Wharfedale, Dali, Missions, Energy, even a few vintage JBLs, Dynaudios and Mirages. I can even take them to my friend's place and compare them to his Wilson Audio Sascha IIs or his (small) Harbeths driven by his Gryphon Diablo.
Give a few weeks for me to be completely happy with the design and we can sort something out.
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