11_juk_06
Not exactly transmission lines, but to my mind, related is the aperiodic enclosure. Dynaco with their A10 & A25 were one of the early successes with this kind of enclosure. In the simplest terms an aperiodic enclosure employs a damped port -- in the case of the dynacos, a piece of compressed fiberglass insultaion covering a slotted port.
This reduces the impedance peak of the enclosure at its resonance and lowers the overall Q of the box, allowing more realistic bass from a smaller box.
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The A10 used a SEAS 6 1/2" alnico midbass & a SEAS 1 1/2" alnico treated textile dome tweeter with a 1kHz XO.
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The classic A25 used a SEAS 10" alnico midbass & a SEAS 1 1/2" alnico treated textile dome tweeter with a 1kHz XO. The later A25XL gained 3 dB of efficiency by utilizing a ceramic SEAS 10" and 1" tweeter
The A25 XO is the same as the tweeter section of the A50 XO mapped below.
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The clasic A35 used a SEAS 10" alnico midbass & a SEAS 1 1/2" alnico treated textile dome tweeter with a 1kHz XO. The later A40XL gained 3 dB of efficiency by utilizing a ceramic SEAS 10" and 1" tweeter
The A35 XO is the same as the tweeter section of the A50 XO mapped below.
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coming soon
The A50 used a pair of 16 ohm SEAS 10" alnico midbass & a SEAS 1 1/2" alnico treated textile dome tweeter with a 1kHz XO. The XO differed from the A25/A35 in that it has a high-pass on the woofers.
Map of XO
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