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PA Top with AMT
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<blockquote data-quote="Carl Klinkenborg" data-source="post: 213439" data-attributes="member: 12770"><p>The Mundorf AMT bears more than a passing resemblance to the Beyma TPL150/H as far as specs go. A friend and I have been using the Beyma units on our separate systems for a few years with single 10" ported mids, and I would say this is about as much as they will keep up with, even crossed-over at 1.8kHz, where the subjective sound quality was much better, bizarrely, than at 1Khz or lower, indicating just how good the mids are.</p><p>Now I am building a pair of PM90s as I plan to cover a larger audience, since the AMT route (unless a line array) is a dead-end output-wise and are quite unsuitable drivers for the PM90/60 unless output is reduced to a ridiculously low level (around 110dB max. if crossing-over at 600Hz) making the project wholly pointless.</p><p>The single ported Beyma 10LW30/N drivers I use (they're very nice!) produce an honest 120-odd db/m from 100Hz at maximum power which matches well with the AMTs flat-out. This combination I feel fulfills the 'HiFi PA' requirement but it's as far as one can go, and multiple upper bass/mid drive units, or those with higher output would be overkill and wasted expense in my opinion.</p><p>I am quite apprehensive regarding the sound quality of the BMS coaxials compared with Beyma AMTs (which are the best-sounding HF drivers I have heard with quality that does not degrade at high levels) since the BMS distortion levels look horrendous in comparison, but one has to ask oneself whether or not they are audible. I truly hope not...</p><p>I believe that Peter Morris built line arrays using Beyma AMTs which I am sure were absolutely wonderful, but you would need deep, deep pockets to reproduce this setup, and perhaps a larger van...</p><p>I'm sorry if the above is not what you want to hear, but there's no messing with the laws of physics unfortunately! Good luck with your project whichever route it takes you, and keep us posted.</p></blockquote><p></p>
[QUOTE="Carl Klinkenborg, post: 213439, member: 12770"] The Mundorf AMT bears more than a passing resemblance to the Beyma TPL150/H as far as specs go. A friend and I have been using the Beyma units on our separate systems for a few years with single 10" ported mids, and I would say this is about as much as they will keep up with, even crossed-over at 1.8kHz, where the subjective sound quality was much better, bizarrely, than at 1Khz or lower, indicating just how good the mids are. Now I am building a pair of PM90s as I plan to cover a larger audience, since the AMT route (unless a line array) is a dead-end output-wise and are quite unsuitable drivers for the PM90/60 unless output is reduced to a ridiculously low level (around 110dB max. if crossing-over at 600Hz) making the project wholly pointless. The single ported Beyma 10LW30/N drivers I use (they're very nice!) produce an honest 120-odd db/m from 100Hz at maximum power which matches well with the AMTs flat-out. This combination I feel fulfills the 'HiFi PA' requirement but it's as far as one can go, and multiple upper bass/mid drive units, or those with higher output would be overkill and wasted expense in my opinion. I am quite apprehensive regarding the sound quality of the BMS coaxials compared with Beyma AMTs (which are the best-sounding HF drivers I have heard with quality that does not degrade at high levels) since the BMS distortion levels look horrendous in comparison, but one has to ask oneself whether or not they are audible. I truly hope not... I believe that Peter Morris built line arrays using Beyma AMTs which I am sure were absolutely wonderful, but you would need deep, deep pockets to reproduce this setup, and perhaps a larger van... I'm sorry if the above is not what you want to hear, but there's no messing with the laws of physics unfortunately! Good luck with your project whichever route it takes you, and keep us posted. [/QUOTE]
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