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Acoustic Elegance AV12-X D2!
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<blockquote data-quote="John_E_Janowitz" data-source="post: 6103588" data-attributes="member: 550657"><p>The curves I posted are measured curves of the driver in an open test baffle. I can easily do in car measurements if you tell me which type of vehicle and enclosure you'd like measurements of. RTA isn't really sufficient though as even a 1/12th octave RTA isn't all that telling. You can have extremely deep, but narrow dips that are masked by an RTA. Unsmoothed FFT measurements are much more sufficient as they don't have this effect. This is what was done in the in-car response of Bose301's MAGV4 that I had posted.</p><p></p><p>The "silicone smeared on the cone" is a high temperature silicone good to about 500F with a very high dielectric strength. It is painted on to insulate the lead wires from ever coming in contact with the bottom of the conductive aluminum cone. We had considered using felt like most everyone else does to eliminate lead wire tap, or a silicone rubber pad attached with silicone adhesive. It turned out that the adhesive was clearly sufficient as an insulator without the silicone foam ever being attached. It also adds some further damping to the cone resonance and brings down the magnitude of the 2.4K breakup by a good 5-6dB.</p><p></p><p>Yes, in a car I wouldn't recommend over 100hz. In most cases for an SQ system where you don't need huge levels from your midbass, I'd cross over in the 50-60hz region. We do the same in most home theater setups as long as the main LCR can handle the midbass duty appropriately.</p><p></p><p>John</p></blockquote><p></p>
[QUOTE="John_E_Janowitz, post: 6103588, member: 550657"] The curves I posted are measured curves of the driver in an open test baffle. I can easily do in car measurements if you tell me which type of vehicle and enclosure you'd like measurements of. RTA isn't really sufficient though as even a 1/12th octave RTA isn't all that telling. You can have extremely deep, but narrow dips that are masked by an RTA. Unsmoothed FFT measurements are much more sufficient as they don't have this effect. This is what was done in the in-car response of Bose301's MAGV4 that I had posted. The "silicone smeared on the cone" is a high temperature silicone good to about 500F with a very high dielectric strength. It is painted on to insulate the lead wires from ever coming in contact with the bottom of the conductive aluminum cone. We had considered using felt like most everyone else does to eliminate lead wire tap, or a silicone rubber pad attached with silicone adhesive. It turned out that the adhesive was clearly sufficient as an insulator without the silicone foam ever being attached. It also adds some further damping to the cone resonance and brings down the magnitude of the 2.4K breakup by a good 5-6dB. Yes, in a car I wouldn't recommend over 100hz. In most cases for an SQ system where you don't need huge levels from your midbass, I'd cross over in the 50-60hz region. We do the same in most home theater setups as long as the main LCR can handle the midbass duty appropriately. John [/QUOTE]
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