I once tried my little Onkyo from my bedroom system on my Maggies. It's rated at 44/70. To my amazement, it was really good! That little Onkyo is a gem.
Shocked. Need Opinions. How muck power do I need?
I’m moving so of my sound gear around. As a temporary measure, I set up my little Cambridge EVO 75 in my main system. Driving my Dali Mentor 6s in a large room (36x36). Speakers are 9 feet apart and seat is 10 feet from speakers. This 75 water replaced my much more powerful monoblocks. To my shock, the amp drove these speakers just fine. The bass was a little weaker, but perfectly acceptable. Here’s what I want to know— if 75 watts are enough, will 40 watts do? I’m talking all solid state. What say you?
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In some ways, a high performance amplifier is like a high performance race car. It needs to accelerate instantly and then stop on a dime - without swerving off the track. Transient response* is an important factor in amplifier design. In audio, an example would reproducing a 96 piece orchestra that’s reaches a crescendo, then pianissimo. The finale of Gershwin’s ’Rhapsody in Blue’ would be a good example. Other examples would include: hearing a close-mic’d plucking of a guitar string - or - the thwap of a drum stick hitting a snare drum - and then the decay that follows. Does it sound like the real thing? A good synergy between the amp and speakers will define that. Much depends on the kind of music being listened to and the priorities of the listener. _ _ _ _ _ * In electrical engineering and mechanical systems, the transient response refers to the temporary behavior exhibited by a system when subjected to a sudden change or disturbance in its input. It encompasses the system’s reaction to a stimulus before it settles into a stable, long-term state1. Specifically:
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@ssg308 The 250.8 does approx 16 Watts peak in class A into 8 ohms and half that into 4 (according to Pass) |
Independent of the quality of amplification, the quantity you need is actually really small if one is listening at a close distance. The speaker sensitivity is the key metric for power requirements. The simplified math is: 1w of power can deliver the speaker’s sensitivities volume (e.g. 86db) at 1m (3.28 ft) listening distance. For every decibel volume increase above 86db requires double the power. For every meter distance requires double the power. Therefore… If one sits 5m (16.4 ft) away from a rated 86db sensitive speakers and wanted to listen to their music at 86db, he/she would 5w of power. If the volume is increased to 87db, 10w of power is required. 88db would require 20w 89db would require 40w 90db would required 80w and so forth. You can see there’s an exponential growth of power required when both distance and volumes requirements grow. That said, the rated speaker sensitivity db, typically around 84 to 96db, is a very high listening volume for most audiophiles. A lawnmower is typically around 94db. Took a measurement using a free dB phone app and I’m usually listening to music around 60db to 75db.
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