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<blockquote data-quote="John Roberts" data-source="post: 132958" data-attributes="member: 126">Re: Crest Pro-Lite Questions&nbsp; - Two 3.0 bridged or one 7.5 for a pair of Danley TH118I spent too many years trying to explain to customers about the difficulty in trying to translate simple sine wave testing to real world music reproduction. Music with a very few obscure exceptions does not consist of full scale sine waves held for seconds at a time**.&nbsp; Many amplifiers will shut down after only seconds of driving a dummy load to full power. Don&#039;t try driving your speakers that way, while standing in the same room (my ears are bleeding). As i have said before and recently, amp designers put in the amount of power output duty cycle that the majority of their customer need, not what they think they want. The days of 24x7 full continuous power amplifier went the way of the dodo bird along with 4 ohm minimum loads and modest power levels. The higher the power output the less likely any speaker system could survive full application of that power for any duration. Music consists of loud parts&nbsp; and more modest average power levels. In an efficient market where manufacturers respond to customer&#039;s buying behavior, amplifiers (and speakers) have evolved to be more like the music (go figure.)JR*** there were a few new (new decades ago) genres (like trance?) that involved significantly denser bass content that old school R&amp;R. Also multi-amped systems can impose heavier duty loads on the LF bandpass section than playing wide range.[edit] The amplifier power stage is dominated by different limitation that the power supply. Amplifier output stages are typically dissipation limited, while power supply is amps times volts. The calculus is somewhat different for class D amps where dissipation is less of a concern and amplifier stages are limited by peak current, but this is getting kind of esoteric. [/edit]</blockquote>

[QUOTE="John Roberts, post: 132958, member: 126"] Re: Crest Pro-Lite Questions - Two 3.0 bridged or one 7.5 for a pair of Danley TH118 I spent too many years trying to explain to customers about the difficulty in trying to translate simple sine wave testing to real world music reproduction. Music with a very few obscure exceptions does not consist of full scale sine waves held for seconds at a time**. Many amplifiers will shut down after only seconds of driving a dummy load to full power. Don't try driving your speakers that way, while standing in the same room (my ears are bleeding). As i have said before and recently, amp designers put in the amount of power output duty cycle that the majority of their customer need, not what they think they want. The days of 24x7 full continuous power amplifier went the way of the dodo bird along with 4 ohm minimum loads and modest power levels. The higher the power output the less likely any speaker system could survive full application of that power for any duration. Music consists of loud parts and more modest average power levels. In an efficient market where manufacturers respond to customer's buying behavior, amplifiers (and speakers) have evolved to be more like the music (go figure.) JR *** there were a few new (new decades ago) genres (like trance?) that involved significantly denser bass content that old school R&R. Also multi-amped systems can impose heavier duty loads on the LF bandpass section than playing wide range. [edit] The amplifier power stage is dominated by different limitation that the power supply. Amplifier output stages are typically dissipation limited, while power supply is amps times volts. The calculus is somewhat different for class D amps where dissipation is less of a concern and amplifier stages are limited by peak current, but this is getting kind of esoteric. [/edit] [/QUOTE]

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