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Low Earth Orbit
DIY Audio
A not so DIY line array
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<blockquote data-quote="Peter Morris" data-source="post: 202226" data-attributes="member: 652"><p>Yes its a TPL200H ... these are not ribbon drivers like the Stage Accompany, they are air motion transformers. The operating principle is different. The displacement of the ribbon is the greatest in the centre and fixed at the ends. The displacement of the AMT diaphragm is the same over its entire length making it even more suited to line array applications.</p><p></p><p>Yes I think the distance between the drivers will be fine especially given how the ATM works and the phase plug used on the 8".</p><p></p><p>Horizontally to minimize problems I'm using a high slope FIR crossover. Its a compromise between making the design symmetrical with narrowing MF directivity ... and ... a non-symmetrical design with almost perfect horizontal directivity - the FIR brick wall crossover trick seems to work - its measures and sounds excellent both on and off the horizontal axis. FWIW this is the approach Martin Audio have taken with the MLA.</p><p></p><p>The use of a high slope FIR also allows a low-ish crossover frequency between the HF and MF driver further minimising the distance issue you mentioned.</p></blockquote><p></p>
[QUOTE="Peter Morris, post: 202226, member: 652"] Yes its a TPL200H ... these are not ribbon drivers like the Stage Accompany, they are air motion transformers. The operating principle is different. The displacement of the ribbon is the greatest in the centre and fixed at the ends. The displacement of the AMT diaphragm is the same over its entire length making it even more suited to line array applications. Yes I think the distance between the drivers will be fine especially given how the ATM works and the phase plug used on the 8". Horizontally to minimize problems I'm using a high slope FIR crossover. Its a compromise between making the design symmetrical with narrowing MF directivity ... and ... a non-symmetrical design with almost perfect horizontal directivity - the FIR brick wall crossover trick seems to work - its measures and sounds excellent both on and off the horizontal axis. FWIW this is the approach Martin Audio have taken with the MLA. The use of a high slope FIR also allows a low-ish crossover frequency between the HF and MF driver further minimising the distance issue you mentioned. [/QUOTE]
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A not so DIY line array
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