2. amps-preamps
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Hooked up an old realistic power meter

Not sure if anyone remembers the Realistic APM-300 and I've  had one from years ago and decided to hook it back up for fun. According to it, for most music and volume I listen to, it says I'm using barely a watt.

My speakers are 87db for one watt, amp pushes 225. My sounds level meter confirms the approx. 88 decibels I listen to and I did crank it up to around 90+ decibels and was still only using a few watts.

For some reason I though I would be using way more power than that and wonder why if everything is correct, why I need such a big amp?

norton
carlsbad2's avatar
carlsbad2
1,362 posts
 

You don't need such a big amp.  I am currently listening to a 2 wpc amp, probably most of the time at closer to 1/4 watt.  Now my speakers are 96 dB so that helps.  

photo of my system as currently configured.  amp looks tiny on top of the system.

https://photos.app.goo.gl/vAMi1ejqXZDaLVNNA

erik_squires
15,670 posts
 

Your meter is probably reasonably close to correct. :)

You really don’t need a big amp unless your speakers are hard to drive, and you don’t need watts so much as current.

Current sometimes, and often not, comes with bigger amps.

You might want to look at an online power / dB calculator. For 10dB louder you need 10x more power, so to go from 87 to 97 you would need 10 watts, from 97 to 107 you’d need 100.

Of course it is important to note that those meters are slow responding.  Instantaneous transients will peak at higher outputs. 

norton OP
83 posts
 

My speakers are PMC and always read that they are hard to drive and need lot's of juice but am now rethinking it. All my amps are getting really up there age wise and have been looking at replacing the main one just to be spending some of the grandkids money and something to look forward to. lol

At this age I don't have a lot I enjoy but have always had a great love for listening to music and buying all kinds of different equipment.

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