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<blockquote data-quote="n2audio" data-source="post: 294298" data-attributes="member: 540940">Take the Vibe 430 for example - it&#039;s rated for 400x2 bridged.&nbsp; With a pair of 25A fuses I KNEW when I bought it that it wasn&#039;t going to make that kind of power, but I knew it would be a good amp considering it&#039;s only $150 shipped.&nbsp; After I had it a while I found some benchtest info on it.&nbsp; It does 296x2 bridged.&nbsp; If you use the fuse estimate for power you get --&amp;gt;&nbsp; 14.4 x 25 = 360x2 which is pretty close to what it actually puts out.&nbsp; If you mulitply 360x.825 you get 297.&nbsp; Does that mean the amp is 82% efficient?&nbsp; No - it means you have to consider that a fuse can pass 200% of it&#039;s rated current for about a second before blowing.If you apply the 82% to the 720 you came up with you get about 600 watts.&nbsp; How many other amps out there are going to give you 600 watts (tested) for $160 shipped?All I&#039;m trying to say is that the Vibe&#039;s are worth considering if you&#039;re on a budget.&nbsp; Are they over-rated? - yep - never argued that.&nbsp; But they ARE a good buy.Optidrives are a completely different league.</blockquote>

[QUOTE="n2audio, post: 294298, member: 540940"] Take the Vibe 430 for example - it's rated for 400x2 bridged. With a pair of 25A fuses I KNEW when I bought it that it wasn't going to make that kind of power, but I knew it would be a good amp considering it's only $150 shipped. After I had it a while I found some benchtest info on it. It does 296x2 bridged. If you use the fuse estimate for power you get --> 14.4 x 25 = 360x2 which is pretty close to what it actually puts out. If you mulitply 360x.825 you get 297. Does that mean the amp is 82% efficient? No - it means you have to consider that a fuse can pass 200% of it's rated current for about a second before blowing. If you apply the 82% to the 720 you came up with you get about 600 watts. How many other amps out there are going to give you 600 watts (tested) for $160 shipped? All I'm trying to say is that the Vibe's are worth considering if you're on a budget. Are they over-rated? - yep - never argued that. But they ARE a good buy. Optidrives are a completely different league. [/QUOTE]

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