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RE: Tweeter difference problem with 3.3Rs and more

Gotcha some values, I looked them up on Maplin so there is probably going to be a chance to get them in the nearby store.

C1 is 220 nF - N44CN 0,22 UF

R1 is 2000 Ohm - M2K

C2 is 45 nF, 43 to 47 is ok. Since you have 44 nF caps already, you can just reuse them

The pole frequencies are 353 and 177 hz for a 2nd order Butterworth high pass at 250 hz.

Re phase variation on analog crossovers. Although the calculated values should work and you can calculate the phase at the critical crossover area where both filters are operating and both drivers have substantial contribution to the overall output, there are additional issues related to geometry and stray inductive and capacitive reactance from the power amps or preamp. So there may be a need for some tweaking - but normally, the minor phase issues can be addressed with tuning the toe in angle. If the values turned out off for some reason (wrong impedance values from the amp maker for example) then it will have to be redone, and probably more than once.

Asymmetrical slopes do not add that easily and need to be calculated carefully to have them match up appropriately. With experimentation with the Behringer, you can find the best matchup of phase and use that to guide your component selection for the analog side. When we get to the point of at least trying a LP PLLXO we will as Andy to stick the values into LSP CAD to simulate the crossover and make sure phase is a non-issue.

While I like the old Denon 103, it had always struck me as old fashioned and missing the top octave entirely. I never had a 304 but reviews and forum discussions are very positive. I would love to try it. Thanks for the offer. How long would I have to play with it?

I have a Melos 333 Gold phono stage with easily changed loadings - wonderful tube piece with great dynamics and a wide close up presentation and good gain. I have an Audible Illusions Dual Mono, rewired recapped and with new switches and pots, and a Dayton Wright SS active stepup that has a slightly noisy set of bipolar transistors - 16 per channel. Loading is adjustable via replaceable resistors, and I rigged a battery power supply for it which I never remember to turn off, has not been in use for a few years.

The Garrott is an FGS MM with a modified Shibata narrow microline. It is remarkably quiet and very dynamic. People keep being surprised by the lack of surface noise. It compares favorably with quite a few good MCs, most recently against a Lyra Lydian. I don't know the AR77, but it is far more dynamic than the Sure V15 IV MR I used to use, and is as musical if not more so. Very lively. Their "innovation" is taking out all the damping out of the cartridge, but for the cantilever mount. Sort of like the Music Maker in that regard.

I love DeParavicini's designs, his tube amps are to die for, and his little phono box is amazing considering its cost. Wow.

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