Polk LSI15 - losing volume / SPL output after few hours of playback
jeecraigs
Posts: 3
Hi, my polk LSI15's seem to lose volume with continued play time on my tube amp ( 4 ohm connection ) - they start off reasonably well but then after playing for a few hours, seem to quieten down about 3 -6db vs before. I have them turned off for now, will check again in the morning but I have a dats audio V2 and took some impedance measurements - speaker dips down to 3 ohms at 100Hz and also dips down to 3 ohm in the 2-3KHz range - Is that normal? Has anyone plotted these to see how low an impedance they go? They are rated at 4 ohms but they also seem to go up to 20 ohms between 20 Hz and again at some higher frequencies.. Will try to share the impedance plot in next post.
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Impedance varies with frequency, so the answer to your question is yes, it is normal.Political Correctness'.........defined
"A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."
President of Club Polk -
Understood, question is should it be dropping that low at any frequency though?
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Understood, question is should it be dropping that low at any frequency though?
Yes, many 4 ohm speakers drop as low as 2 ohm. It's not unusual by any means.
