how much power you guys think is needed for a mid at 86db and a tweeter at 88db ran thru a nice passive to play loudly
thoughts, opinions?
thoughts, opinions?
7~10 watts or so, depending on how much loss is in the crossover, and how much bass you expect, and the cabinet design.
Speaking of Mr. Joppa, he gives us a rule of thumb. An amp/speaker combo should be capable of producing 102 dB. SPL peaks, at a 1 M. distance. Joppa's Rule suggests that upwards of 32 WPC are needed for an 86 dB. sensitive speaker, but that is for full range. The bass portion of the audio bandwidth is the most power "hungry" and is not a factor in the OP's application. My hunch is that a well executed PP setup using "12" W. multi-grid tubes in either UL or full pentode mode will be satisfactory.
Additional complicating factors are impedance curves, listening venue physical volume, and personal preferences.
Additional complicating factors are impedance curves, listening venue physical volume, and personal preferences.
Define 'loudly' and with what type music and/or movies and the mid's peak power rating.
For instance, if the cinema THX reference is used [pretty loud for HIFI], then 105 dB peaks at your ears, though most folks settle for the lower 1 m reference, so 105-86 = +19 dB = ~80 W: dB calculate - decibel calculation dB calculator voltage power ratio sound pressure level matching dBA SPL sound pressure intensity ratios converter thd percent % audio engineering impedance matching bridging - sengpielaudio Sengpiel Berlin
Ideally you want at least +3 dB dynamic headroom to ensure it doesn't clip = a 150-200 W amp.
GM
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