![]() ![]() ![]() Here the PAP web site came in very handy as they provide dimensions for the individual baffles and plenty of photos of the frames, base plate and the finished speakers. With the results of the coax confirming this is a very nice driver, 2-pair of 15" Monacor woofers were purchased and I started to draft up plans based on the said 'PureAudioProjects' Trio15 OB's. This led to a revised filter for the 2-way XO and best I can tell has resolved the issue. However, there is a ragged rise in response in the driver FR published plot from 2.5K - 3.5K that likely is the causes of this issue. I should say David's listening room is quite large and not any easy room to drive speakers and perhaps we had the baffles placed too close to the rear boundary wall but the volumes we were having to use in that room are far in excess what one would be listening in a home environment. It was at this meet that Nick commented he liked what it was doing, but noted that beyond a volume level something was breaking up badly, I would guess it was around the 2k area, can't say if it was the cone or the horn, but it was a clear something is far from happy noise. These are the baffles I took along to the last 'Yorkshire HiFi Club' meet at David's (MCRU) premises in Huddersfield since Nick Gorham had expressed an interest in hearing the driver as a possible replacement for his Fostex FE167/FT17H drivers on his own OB speakers that he has not been 100% happy with. ![]() Scott and I have found in the past the published data of the Monacor drivers has been pretty accurate to be relied on so this gave some degree of confidence.īefore progressing a design further I decided to purchase a pair the coax drivers for testing purposes and Scott came up with a test baffle design and a suitable 2-way XO to get me started. ![]() This has a 96dB bass unit with a coaxially arranged horn tweeter with a 1" voice coil and 105dB efficiency. I asked Scott (Scottmoose) to check these out for me and he suggested, based on the published datasheets, the 10" version would be best suited for our purposes. I wanted however to do something a little different to the normal 2-way baffles using a full-range driver with bass helper(s) and came across a new range of professional 2-way coaxial PA drivers from Monacor as part of their 'Stage Line' range of offerings. For a while I had been thinking of building a pair of OB speakers but couldn't find anything I liked that had a certain WAF and appeal to me until I came across the PureAudioProjects web site and their Trio 15 range of open baffle commercial speakers,, and then MaxN posting up on Audio-Talk forum his own version of these using the MarkAudio Alpair 12P full ranger and a pair of Eminence 15" woofers inspired me to start checking out suitable alternative drivers for my own project. ![]()
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