On 5/05/2016 5:37 PM, Phil Allison wrote:
Eiron wrote:



Because of the Australian fashion for designing speakers with impedances
that drop to zero at the crossover frequencies.



** Not afraid of making a gross overstatement - are you ?

FYI:

There are far more examples of bad loudspeaker x-over design from the USA.

How about the once popular Acoustic Research AR11 model ??

http://www.classicspeakerpages.net/I...1251408626.jpg

All three drivers used are 4 ohms types with the dome mid and tweeter operating in *parallel* over the range above 2kHz - making the impedance 2 to 2.5 ohms in that range.


**Or the Infinty 4.5. Two 4 Ohm voice coils in parallel, with another
pair of 2 Ohm voice coils operating in the low bass in parallel with
them. Back in the late 1970s, I was called in to investigate why the
speakers were destroying so many big amplifiers. I guess the 0.75 Ohm
load in the bass region had a lot to do with it. Even Peter Stein's
ME100 only lasted a few weeks (which is a lot longer than any Phase
Linear did), causing him to revise the VI limiting in that model to
cope. Apparently, the current limiting transistors over-dissipated, then
failed, leading to the eventual destruction of the output devices. Peter
always ensured his big amps could deal with such loads from that time on.


--
Trevor Wilson
www.rageaudio.com.au

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