HF resistor change a revelation on 12" Tannoy HPD's

Thanks for finding that, Al. Unfortunately I could not open the link but I found an alternative crossover image here, including one which foregoes the autoformer entirely:

https://www.hilberink.nl/codehans/tannoy36.htm

I don't have a lot of experience with the use of autoformers in speaker crossovers, as for the most part they predate me, but as far as I can see this is an impedance compensating resistor. It keeps the impedance of the transformer stable as the switch changes.

In this case, it looks like Elizabeth was correct, and the absolute value there is less important than elsewhere, but it's value will probably affect the absolute location of the high pass filter.



Best,

E

Hey Elizabeth,
It depends on where the resistor is.


Any time you want to go through a speaker crossover simulation with me I'll be happy to show you why this can be true. 

Best,
E

Room acoustics matter a great deal, including between and behind the speakers.

I'd be interested to know exactly what this particular resistor was doing. Doubling or cutting that in half seems like a big deal, but it's also a rather large value, was it in an impedance compensation network?