Sub 4 ohm drivers

[indr]

Anyone makes sub 4 ohm (e.g 2 ohm etc) drivers at production level?
What are the classic vintage ones to mention? Full range or else.
Recently found some old Philips made with alnico cores, good ones.

 

[pblix]

This is the only one I know of that is advertised as such: Parts-Express Bose RSB901-1 replacement.

That said, as you probably know, most speakers measure considerably less DCR than their rated impedance. If you measure vintage speakers the DCR is generally much closer to nominally stated impedance. It seems there has been an impedance inflation in the last 30 or so years.

 

[turk 182]

look at car audio drivers dual 4 ohm are common. parallel connections of multiple drivers could get you close, question is why?

 

[indr]

That said, as you probably know, most speakers measure considerably less DCR than their rated impedance. If you measure vintage speakers the DCR is generally much closer to nominally stated impedance. It seems there has been an impedance inflation in the last 30 or so years.

Like your sense of humour) yes, that's you can call impedance inflation. I had measured a Sony made woofer rated 16 ohms eighteen years back at 14.6 ohms. It now shows 12 ohms!
Probably the ferrite core material degradation (depreciation?) has something to do with this.

 

[indr]

question is why?

Loudness, what else?

 

[turk 182]

well if you got an amp that's 2 ohm stable and a driver with good sensitivity who am i to judge, just wanted to know...