Hi guys,
I just purchased a pair of good ol' KEF LS50, no 'meta'. I couldn't resist. Subwoofers are readily available from my stock. So, how is it related to the Purify?
The design of the specimen tested here is flawed in many aspects. First of all, the bass reflex is compromised. The port too long, the width of the pipe still too small. The layout doesn't exploit the available excursion fully. Yep, the limits can be calculated. With the given excursion a sealed box would provide quite similar power output, but without the nasty problems connected to pipe resonance. A passive radiator wouldn't help much, as that would be too heavy and eventually shake the whole thing around. Or it would resonate in itself ...
Second to that, of course, the tweeter. Why is it, that people always want some pepper in quite every dish? The AMT is clearly the showbreaker. It asks for too high of an XO frequency, and still delivers sparkle with all that distortion. One might say it rattles, right? Benefits, in objective terms are non exsitent. Just storytelling, talking people into masochistic compromises while they are no more necessary today, right?
As already stated, some hypothetical virtues of the middriver are not well presented with this reference design.
A better approach would be something very much along the lines of the Burchardt 400: sealed with less volume, reflexed with same volume, a waveguided regular 25mm dome, XO'ed at about 1,2kHz.
But, if that would be done well, nothing more would be achieved than a very standard 8" driver could deliver for a fifth of the cost, e/g Dayton 225
As the latest test of the JBL 708P might have shown, size matters. Even with that some comments argued, a 3-way made from cheaper, less top grade material could be as good.
Could someone please convince me to send the LS50 back? It was still a significant expensive for me, personally. Only that the LS50, supported by 2..4 subs of course, addresses problems with sound distribution, which the Purify design just ignores. I think the LS50 is still good news, while in respect to the Purify I doubt such merits.
TU
I just purchased a pair of good ol' KEF LS50, no 'meta'. I couldn't resist. Subwoofers are readily available from my stock. So, how is it related to the Purify?
The design of the specimen tested here is flawed in many aspects. First of all, the bass reflex is compromised. The port too long, the width of the pipe still too small. The layout doesn't exploit the available excursion fully. Yep, the limits can be calculated. With the given excursion a sealed box would provide quite similar power output, but without the nasty problems connected to pipe resonance. A passive radiator wouldn't help much, as that would be too heavy and eventually shake the whole thing around. Or it would resonate in itself ...
Second to that, of course, the tweeter. Why is it, that people always want some pepper in quite every dish? The AMT is clearly the showbreaker. It asks for too high of an XO frequency, and still delivers sparkle with all that distortion. One might say it rattles, right? Benefits, in objective terms are non exsitent. Just storytelling, talking people into masochistic compromises while they are no more necessary today, right?
As already stated, some hypothetical virtues of the middriver are not well presented with this reference design.
A better approach would be something very much along the lines of the Burchardt 400: sealed with less volume, reflexed with same volume, a waveguided regular 25mm dome, XO'ed at about 1,2kHz.
But, if that would be done well, nothing more would be achieved than a very standard 8" driver could deliver for a fifth of the cost, e/g Dayton 225
As the latest test of the JBL 708P might have shown, size matters. Even with that some comments argued, a 3-way made from cheaper, less top grade material could be as good.Could someone please convince me to send the LS50 back? It was still a significant expensive for me, personally. Only that the LS50, supported by 2..4 subs of course, addresses problems with sound distribution, which the Purify design just ignores. I think the LS50 is still good news, while in respect to the Purify I doubt such merits.
TU
