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In the Forum: Playback Listening
In the Thread: Remedies the Beauty
Post Subject: Online we can claim a lot...Posted by rowuk on: 11/7/2022
 Edgar= wrote:
Not Amplitude. It's the rock solid phase linearity. It feels like a brick wall all the way up and down. I haven't looked at any graphs and haven't measured anything but that is my guess. 
There is no question of the great tone of vintage Tannoy but also it shines from a point source perspective IMO. I assume there is a relationship between its phase linearity and its duel concentricity.

N-set, I use a Yamaha DSP-492 for reverb injection.

Regarding the passive radiator situation. I did a slo-mo recording of the drivers with a sweep from 1hz up to 200. The PR is out of phase from 1hz up to about 55hz and then appears to lock on and is in phase from there up. 

Impossible. A passive radiator can NOT change its tuning frequency on the fly. It is a Helmholz resonator - one single tuning frequency. It is also NEVER in phase, it is always late as it takes several cycles to get resonant. It is possible that at the tuning frequency and its multiples (55Hz, 110Hz, 165Hz), that it adds a maximum to the pressure. If the Q is low enough, it will resonate at its tuning frequency even if exposed to frequencies slightly higher or lower. THis is one of the reasons for lower pitch definition in resonant systems (port/PR/transmission line.
I agree with Paul about vintge spekers sounding best when the front and rear are equally loaded - like with an infinite baffle (box bigger than VAS).

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