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In the Forum: Playback Listening
In the Thread: Remedies the Beauty
Post Subject: More on PRPosted by N-set on: 10/28/2022
Thank you Rowuk for the explanations.
 rowuk wrote: |
| The Tannoy driver moves at 32 Hz, the passive radiator can only move at its tuned frequency - 30 Hz.
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I understand what you are trying to say, but the Fs resonance has it's width. Not sure how representative the plot from here is (scroll down pls):
https://diy.midwestaudio.club/discussion/909/ported-vs-passive-radiator-designs-thoughts
but it shows a pretty wide PR resonance.
In any case, as far as I understand the rapid phase variation by a total of 360deg makes any matches with additional channels a huge challenge. Adding a PR sub like I fantasized above seems to have a limited value due to the persistent notch (and the phase rotation) at the PR Fs. SS Fs is already low around 20+Hz, finding a PR that would go significantly lower is a no-go, unless mass loading the cone. OTOH, accepting the 20+Hz notch as the lowest freq, which is IMHO already a v good result for such a compact design, opens a way of using a sub with the same ScanSpeak PR, say 2 parallel SS + 1 SS PR, as a reinforcement channel. It will have the +/- the same notch but will add output before it. Or am I talking bs?
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