blakep82
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| posted on 10/8/09 at 12:30 PM |
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yamaha amps? and impedance?
whats everyones thoughts?
for some reason, i wouldn't normally consider them for hi fi amps, but this looks pretty
good, and its £180 from richer sounds.
as for impedance, the spec of the amp says 105watts rms per channel at 4 ohms. the speakers i've got now, and the ones i want to get (cerwin
vega, eventually) are quoted at 8 ohms. what will be the effect of this?
actually, on the cerwin vega site, they actually say 'up to 8 ohms'
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greglogan
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| posted on 10/8/09 at 12:34 PM |
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Usually when impedence reduces, the effect on the amp is to make it work harder. So in theory with a higher impedence eg 8ohm speakers, the wattage
of the amp would be effectually reduced. As to what degree, I'm not sure. But you defo wouldn't be getting the 105W quoted as this figure
relates to a loading of 4 ohms.
Hope this helps
Greg.
[Edited on 10/8/09 by greglogan]
Women are meant to be loved, not understood.
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flak monkey
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| posted on 10/8/09 at 12:39 PM |
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You would get circa 75watts into 8 Ohms, or there abouts.
Most yamaha receivers have a switch on the back to select the impedance of the speakers which are connected.
If you want a 2 channel hi-fi amp then you cant really beat the Cambridge Audio stuff at that price point.
If you want surround sound but a proper hi-fi amp for your front 2 channels then I have a Yamaha DSP which is for sale which provides the sub, rear
and centre channels amplification and processing.
Cheers,
David
Sera
http://www.motosera.com
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blakep82
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| posted on 10/8/09 at 12:45 PM |
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quote:
Originally posted by flak monkey
If you want surround sound but a proper hi-fi amp for your front 2 channels then I have a Yamaha DSP which is for sale which provides the sub, rear
and centre channels amplification and processing.
Cheers,
David
ah, cool. what one is it? and how much are you looking at?
we've got a yamaha rx-v363 downstairs, and quite impressed by it, but i think the speakers its on are really poor. if i got one, it would be on
quite loud. i could always take the one from downstairs and put it on my speakers, but its a lot of work lol
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flak monkey
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| posted on 10/8/09 at 12:51 PM |
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Its one of these:
http://www.yamaha.com/yec/products/productdetail.html?CNTID=200324&CTID=5002600
Looking for £50 posted
You basically just need an amp with a pre-out or tape loop to use as the input for it.
It has pre-outs for all channels and amplified outputs for centre and rear, i.e. you would only need an active sub.
I was going to set it up at home but can't be bothered, I am happy with stereo at the moment 
I have a Yamaha Receiver at my girlfriends which gets used for music and films.games in here room. Its ok, but not a patch on hi-fi.
David
[Edited on 10/8/09 by flak monkey]
Sera
http://www.motosera.com
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blakep82
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| posted on 10/8/09 at 01:22 PM |
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cheers David, i don't have any amp at the moment, well, i do, but its well on its way out. humming, buzzing, and cutting out on one speaker.
whats the power output of it though? looks like 15w? or am i reading that wrong?
looking at the specs again, the rx-v365 says 105w per channel at 4ohm, but on the back of them it says use speakers of 6 ohm impedance minimum or it
could damage stuff
the amp itself is really going to be used mostly for my decks upstairs, (DJing) and perhaps the odd dvd so maybe i don't need perfect sound
quality etc.
[Edited on 10/8/09 by blakep82]
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flak monkey
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| posted on 10/8/09 at 01:36 PM |
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Yeah its 15 watt per channel which is all you need for rears and centre really as you need smaller speakers etc to keep the sound balance right.
The min impedance will be selectable if its anything like all the other Yamaha receivers I have seen. Either 4 or 6 ohms depending on what speakers
you have.
If its jus for movies and stuff then a receiver will be more than good enough.
Sera
http://www.motosera.com
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blakep82
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| posted on 10/8/09 at 01:57 PM |
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well, i'll be using it mostly for DJing at home, so won't be putting it right up too loud. but quite loud.
there's no switch on the back of the one down stairs, but it says 6ohm minimum on the back, so 8 will be fine. doubt i'll use all 100w of
it, but i like that extra there
besides my room's only about 3m x 4m
just ran the auto setup on the one downstairs, sounds a lot better now.
plus radio built in, surround etc, yeah, i think i'll be getting one.
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zilspeed
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| posted on 10/8/09 at 03:59 PM |
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I have a couple of these in a rack and they are fed by an active
crossover.
That's just about right for bedroom use I reckon...
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MikeRJ
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| posted on 10/8/09 at 04:48 PM |
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Power output = (V*V)/(8*R)
Where V=peak-peak output voltage from the amp and R=speaker impedance.
Doubling speaker impedance will nominally half the output power, all else being equal. However in most commercial grade amplifiers, when using low
impedance speakers the output power is most often limited by either thermal constraints, or the power supplies drooping with the high peak currents.
This means it's quite likely you will get a bit more than 75Watts with 8 ohm speakers.
Another way of looking at this is if a commercial grade amplifier gives 100Watts with an 8 ohm speaker, it's unlikely to manage a genuine 200
watts with a 4 ohm speaker, even if it's rated for 4 ohm use.
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