175 diaphram

[Beowulf57]

A similar situation arises with the 2405/077. While functionally equivalent, they do/did list separate diaphrams. As we know the 077 diaphrams had the blue rings while the 2405s had the gold rings. On the Behringer 61-band RTA, my 077's and 2405's show slightly different spectra.

Is this a large enough sample to rule out simple unit to unit variation? As in could one observe this amount of difference between two 077's or two 2405's?

[toddalin]

Is this a large enough sample to rule out simple unit to unit variation? As in could one observe this amount of difference between two 077's or two 2405's?

Small sample, but the two patterns were pretty much distinguishable. Most of the difference was below the typical crossover frequency, but is evidenced by using pink noise and a simple cap of about 4 mfd.

[Mr. Widget]

Is this a large enough sample to rule out simple unit to unit variation? As in could one observe this amount of difference between two 077's or two 2405's?

No, the sample size wouldn't be conclusive, and a Behringer test is hardly conclusive. That said, there is a thread where the different ring radiator diaphragms were physically compared and the diameters of the inner aluminum rings are measurably different. The diaphragms are different, each one specifically designed for it's application.


Widget