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DIY Audio
New DIY Mid High (90deg) - AKA PM90
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<blockquote data-quote="Peter Morris" data-source="post: 133487" data-attributes="member: 652"><p>Re: New DIY Mid High</p><p></p><p></p><p></p><p>Thanks again Simon,</p><p></p><p>Being located in Australia I don’t get to see all the equipment you have in Europe – I mainly see D&B, L-Acoustic, Meyer, EAW, Turbo, Martin, EV and JBL.</p><p> </p><p>I must say the T24N at 33Kgs and a peak SPL of 143dB looks interesting. I considered building a box similar to T24, but the longer DIY horn gives you a bit more SPL in the 100Hz to 250Hz range.</p><p> </p><p>The BMS 4594HE also has an advantage when compared to other compression drivers, it goes lower and louder than most and the 2 way design mean more pristine VHF without diaphragm breakup issues that you get with typical large format compression drivers . (see my time domain plots in the above post)</p><p></p><p> Below is a rough Hornresp sim of my best guess of the T24 compared to the DIY mid/hi. I tried it with a couple of drivers, the T24 seemed to like a driver with a heaver cone. The top plot is with 2 x RCF 12N405 (1000w) and the bottom with 12N351 (650w). The plots are at maximum power. The DIY uses the 12N351 to minimise the weight - 3.3Kg saving per driver. </p><p></p><p>As you can see the DIY has a 2 – 3 dB advantage in the low-mid according to the sim … but that of course is not the real world.</p><p></p><p>I have also included a picture of the partly constructed DIY and one of my earlier designs - it uses 2 x 10" and the same HF horn with a 4594 and passive crossover.</p></blockquote><p></p>
[QUOTE="Peter Morris, post: 133487, member: 652"] Re: New DIY Mid High Thanks again Simon, Being located in Australia I don’t get to see all the equipment you have in Europe – I mainly see D&B, L-Acoustic, Meyer, EAW, Turbo, Martin, EV and JBL. I must say the T24N at 33Kgs and a peak SPL of 143dB looks interesting. I considered building a box similar to T24, but the longer DIY horn gives you a bit more SPL in the 100Hz to 250Hz range. The BMS 4594HE also has an advantage when compared to other compression drivers, it goes lower and louder than most and the 2 way design mean more pristine VHF without diaphragm breakup issues that you get with typical large format compression drivers . (see my time domain plots in the above post) Below is a rough Hornresp sim of my best guess of the T24 compared to the DIY mid/hi. I tried it with a couple of drivers, the T24 seemed to like a driver with a heaver cone. The top plot is with 2 x RCF 12N405 (1000w) and the bottom with 12N351 (650w). The plots are at maximum power. The DIY uses the 12N351 to minimise the weight - 3.3Kg saving per driver. As you can see the DIY has a 2 – 3 dB advantage in the low-mid according to the sim … but that of course is not the real world. I have also included a picture of the partly constructed DIY and one of my earlier designs - it uses 2 x 10" and the same HF horn with a 4594 and passive crossover. [/QUOTE]
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