High Current vs high power


Hi!

Often you hear/read comments that the current matter more than the power (example Nait) and one should look for high current more than high power etc.?

Can anyone explain that or debunk the myth (my limited physics knowledge tells me that power and current are interrelated for the same voltage and impedance)?

Also, which amplifiers (pre power or Integrated) have 'higher current' than their peers at same power ratings? Is there any specification that shows the current capability of the amp which one can read and compare? like power, THD etc.?

Thanks
K
kelpie

Showing 2 responses by xti16

Bombaywalla +1 a thousand times. Over many years I have discovered specs are really useless. Not even a guideline (like I used to think). It's all about total system synergy. Certain components work better with others and will be horrible with others. Best to take advantage of in home demos. Second would to audition at a friends or dealers with as much of what you own and want to keep (evens if it means bringing some of your own equipment - I've done it). I understand that isn't always possible so if you post a thread best to include Equipment - Room Size - type of music and what sound you look to change. Very important also what you like and don't like.

Ok that being said I didn't answer you question but here is an experience I had. Had a Bryston B100sst driving Dynaudio C1's which is rated at 85db The Bryston B100 was rated @ 180W at 4ohms. I thought more power would make the Dyn C1's sound better. I found 2 integrateds that sounded much more powerful especially in controlling the sound. Naim Supernait and Octave V70se (both rated at 70W). I bought the Octave and have since upgraded to the V110 (again a little more control).

Most important this is what I experienced. Short story - forget specs and just listen.
Hi Al
I wrote that specs are useless because I've seen too many people refuse to even listen to some equipment based on specs alone. I'll admit when starting out I was one of them. I found that I believed specs more than my ears. Later I used my ears. I will admit the only specs that are meaningful would be input and output impedance matching of sources - pre - and amps along with capacitance and inductance of cables. But as far as power and THD a lot of those specs don't necessarily mean more power or a lower THD will sound better especially with your equipment. I'll use my Dyn - Bryston/Octave example. Dyn states my C1's need 180W or more to sound best. The Bryston B100 had 180W (test sheet showed over 200w @ 4 ohms) and the Octave V70SE has 70W at 4ohm. As good as the Bryston was it wasn't until I had an in home demo of the V70 that made me realize that V70 sounded more powerful and has more 'control' over the music.

Bryston has THD+noise:<0.005% 20 to 20khz at 100w into 8 ohms

Octave V70se THD < 0,1% @ 10 Watt into 4 Ohms

Based on those specs one would think the Bryston is a lot better for the Dyn C1's. Honestly it isn't even close. The Octave is a whole lot better which is a reason I stated specs are useless.

George