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zako wrote:

I did not like the two slit configuration of the phase plug..but the five to one compression ratio produced low distortion,,,but i was not impressed with its bandwidth,,,JBL also used a eight inch speaker assembled to a special phase plug,,  You will find it in there TECHNICLE PAPERS... I found it more musicle,,in theaters with out stress,,, the 2490 needs to be coupled to a 2393 type horn,,,another product long throw horn with its own polor problems,,

Zako, I do not expect to be “impressed with its bandwidth”. I do not feel that this diver might be use over 1.5kHz. I am planning to low-pass it at 1000Hz. The way how JBL intended to use it has no relevancy to me. My major concern is how it will react to low signal. It will be driven by one single stage of a tube that has 7W on plate and grossly attenuated. So, it will not see more that 1/2W and it will be very low currant. The reactance to the the low currents is the key as this type of suspension is more suitable for endurance at high power levels. I do not particularly case able it phase plug as the phase plug works at upper knee – or where I do not care.

I plug it for a first time today. It looks like it is sensitive like hell and I did not hear any titanium problems on it even without low pass filter. I do not have infrastructure now to look into it further.

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