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Speakers testing
"Stewart Pinkerton" wrote in message ... On 18 Dec 2003 09:57:24 -0800, (Svante) wrote: "Tony Pearce" wrote in message . au... You still miss the point I was making. The tweeter frequencies can be easily measured using MLS gating systems. The problem is with multi - woofer systems eg. D'Appolito designs commonly available these days. Near field measurements are made on one woofer, then MLS measurements are made for high frequencies. If the room height is small as it usually is, then errors will occur when combining near field measurements at frequencies lower than can be gated. Hmm, in that case I still fail to understand what you mean. Could you enlighten me on what a D'Appolito design is (I must confess I don't know). It's a vertical array with twin bass/mids and a third-order crossover, and it's noted for a very smooth vertical dispersion pattern around the crossover frequency. Many such 'WTW' designs are around today, but not all are true d'Appolito arrays. Many are so-called '2.5 way' designs, which are conventional single bass/mid designs at the tweeter crossover point. Invented by audio legend Joe d'Apollito, hence the name. A minor correction. Mr. d'Appolito does not claim he invented the MTm or if you prefer, the WTW design. This was his comment in an interview I read, I'm sorry, but I can't recall who he said was the first. There is no doubt that he popularized it. I recall in another article that he now prefers implementing these designs with 4th order xovers. If I can find the source of these atrributions I'll post it. Most likely SB. Are you speaking about a closed box or bass-reflex. Can be either, as the key element is the crossover region from bass/mids to tweeter, although most commercial designs seem to be sealed. I realise that the time between direct sound and the first reflection will determine the lowest frequency that can be used when gating an impulse response, but I fail to see why this would make combination of this and near-field measurement hard. Do you mean that it would force us to use the near-field measurement at a too high frequency? I believe that's what he's getting at. -- Stewart Pinkerton | Music is Art - Audio is Engineering |
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