Replacing an 8 ohm tweeter with a 4 or 6 ohm tweeter?

[5th element]

What's wrong with the 913? It is one of the best performing tweeters that you can get regardless of price.

[cafe latte]

Probably nothing, but I would prefere something with a more even response. I know that it is the point of diminishing returns, but if I can squeeze a bit more then why not.. I do think that that on some tracks though that there is something missing which makes me curious (since this thread) if the crossover has be reworked since Wilmslow moved from using the Vifa tweeters over to the 913, because after what you guys have said if the cross over was originally designed for the vifa, then using what they supplied me with (the 913) would be a bit rolled off would it not?
When I originally spoke to Wilmslow when I blew the tweeter he remembered when I bought them, but still asked what tweeters I had as he said they supply a few different tweeters for the k100s and I doubt the crossovers that come direct fom ATC are altered for sure.
Soo I am thinking that if the Vifas were the original of the design, then the 9500 would going on the numbers be balanced like mine (I dont know just what I understand ). So if the vifas are what the crossover should see, then how would the 4662000 measure up now?
Regards
CL

[system7]

Very hard work reading this TBH. But replacing a ferrofluid tweter with a non-ferrofluid type is a complete redesign! Different considerations altogether. Ferrofluid types can get away with second order, non-FF prefer 3rd order.

Mate, you should just replace like with like, Scanspeak Discovery D2608/9130.00, looks a good one to me: Scanspeak Discovery D2608 9130 00

You may have some opions to adjust level and slope without mucking up the phase too much, but that depends on your crossover, which you should analyse. An input resistor to the HF filter can generally be changed without too much harm as long as you know what it does to top end impedance, but everything else like Zobels and pads at tweeter end is select on test!

[jim1961]

If you could find impedance and frequency curves for your old tweets, you might be able to find something that emulates it. Then make sure the new tweets Fs is the same or lower than the old tweets. If you can manage all of that, it might sound ok.

You could just throw something in there, cross your fingers, and have a few resistors on hand to match the output. Not recommended to someone else, but have done this for myself in non critical 2nd components (computer speakers).

[cafe latte]

Originally Posted by system7

Very hard work reading this TBH. But replacing a ferrofluid tweter with a non-ferrofluid type is a complete redesign! Different considerations altogether. Ferrofluid types can get away with second order, non-FF prefer 3rd order.

Mate, you should just replace like with like, Scanspeak Discovery D2608/9130.00, looks a good one to me: Scanspeak Discovery D2608 9130 00

You may have some opions to adjust level and slope without mucking up the phase too much, but that depends on your crossover, which you should analyse. An input resistor to the HF filter can generally be changed without too much harm as long as you know what it does to top end impedance, but everything else like Zobels and pads at tweeter end is select on test!

Yes that is all fine, but what if the crossover has not been redesigned since they fitted the Vifa D27tg-35-06 which I dont think it has? (will know more on this later tonight when I ask). If the crossover has not been altered, then the Scanspeak d2608-9130 are wrong which would explain why it lacks sparkle IMO. I did a bit of checking and ATC for their own factory speakers when they moved over from the Vifa they started using Seas TC25c003 (E0036) not the scanspeak stuff. Is this Seas any good?
Regards
CL