Hi all,
I know that specs never tell you how something sounds or what it looks like or whether you are impressed by the label and so on!
But when I am just looking around or reading posts (casually of course with never any intention of adding yet ANOTHER box to the collection) sometimes it can be a bit helpful with my own thinking processes i.e. internal "value for money" calculations.
So I looked at some power numbers - and I just happened to use Yamaha receivers for convenience but I am pretty sure one could choose almost any brand - the way that specs are presented over time has really changed. I tried quite hard to make a list of "like for like" power specs in watts, from the manuals.
Columns have headings A to J and they mean:
A = RMS, not USA /Canada, 20-20kHz, 8 ohm, 0.6%THD
B = RMS, not USA /Canada, 1kHz, 8 ohm, 0.7%THD
C = RMS, not USA /Canada, 1kHz, 6 ohm, 0.9%THD
D = IHF Dynamic power, not USA /Canada, fronts, 8/6/4/2 ohm
E = IEC, UK, fronts, 1kHz, 8ohm, 0.6%THD
F = JEITA, max output power, 1kHz, 8ohm, 0.9%THD
G = JEITA, max output power, 1kHz, 8ohm, 10%THD
H = JEITA, max output power, 1kHz, 6ohm, 10%THD
I = JEITA, max output power, 1kHz, 4ohm, 0.7%THD (this one used to sort the table from lowest to highest)
J = Zones and/or A/B speaker selection
Series Make Model A B C D E F G H I J
67 Yamaha RX-V567 7.1 90X7 ?/100/110/125 90X2 115 115 1
67 Yamaha RX-V367 5.1 100X5 ?/105/130/150 95X2 135 120 1
40 Yamaha RX-V640 6.1 85X6 105X6 115/140/180/225 100X2 135 1.5 A+B
?? Yamaha RX-V800 5.1 100X5 105X5 125/160/195/230 140 145 1.5 A+B
57 Yamaha RX-V657 7.1 95X7 130/165/195/240 105X2 135 145 2
59 Yamaha RX-V659 7.1 100X7 135/170/200/245 110X2 140 150 2
73 Yamaha RX-V673 7.1 95X7 130/170/200/240 105X2 150 150 2
67 Yamaha RX-V1067 7.2 105X7 135/165/210/280 110X2 145 165 2
67 Yamaha RX-V2067 7.2 130X7 165/210/285/405 135X2 190 190 3
(and the table was a real pain to type out and space/format!)
Most people would think that the three amps all with 100 watts per channel would mean the same power/volume/control whatever from an amp - but look at the J column: using another measurement there is a material difference between them. :2c:
So this means that I have made a bit of a boo-boo in my teenage 's system just to get the convenience of HDMI cables: swopping the 640 for the 567!
I know that specs never tell you how something sounds or what it looks like or whether you are impressed by the label and so on!
But when I am just looking around or reading posts (casually of course with never any intention of adding yet ANOTHER box to the collection) sometimes it can be a bit helpful with my own thinking processes i.e. internal "value for money" calculations.
So I looked at some power numbers - and I just happened to use Yamaha receivers for convenience but I am pretty sure one could choose almost any brand - the way that specs are presented over time has really changed. I tried quite hard to make a list of "like for like" power specs in watts, from the manuals.
Columns have headings A to J and they mean:
A = RMS, not USA /Canada, 20-20kHz, 8 ohm, 0.6%THD
B = RMS, not USA /Canada, 1kHz, 8 ohm, 0.7%THD
C = RMS, not USA /Canada, 1kHz, 6 ohm, 0.9%THD
D = IHF Dynamic power, not USA /Canada, fronts, 8/6/4/2 ohm
E = IEC, UK, fronts, 1kHz, 8ohm, 0.6%THD
F = JEITA, max output power, 1kHz, 8ohm, 0.9%THD
G = JEITA, max output power, 1kHz, 8ohm, 10%THD
H = JEITA, max output power, 1kHz, 6ohm, 10%THD
I = JEITA, max output power, 1kHz, 4ohm, 0.7%THD (this one used to sort the table from lowest to highest)
J = Zones and/or A/B speaker selection
Series Make Model A B C D E F G H I J
67 Yamaha RX-V567 7.1 90X7 ?/100/110/125 90X2 115 115 1
67 Yamaha RX-V367 5.1 100X5 ?/105/130/150 95X2 135 120 1
40 Yamaha RX-V640 6.1 85X6 105X6 115/140/180/225 100X2 135 1.5 A+B
?? Yamaha RX-V800 5.1 100X5 105X5 125/160/195/230 140 145 1.5 A+B
57 Yamaha RX-V657 7.1 95X7 130/165/195/240 105X2 135 145 2
59 Yamaha RX-V659 7.1 100X7 135/170/200/245 110X2 140 150 2
73 Yamaha RX-V673 7.1 95X7 130/170/200/240 105X2 150 150 2
67 Yamaha RX-V1067 7.2 105X7 135/165/210/280 110X2 145 165 2
67 Yamaha RX-V2067 7.2 130X7 165/210/285/405 135X2 190 190 3
(and the table was a real pain to type out and space/format!)
Most people would think that the three amps all with 100 watts per channel would mean the same power/volume/control whatever from an amp - but look at the J column: using another measurement there is a material difference between them. :2c:
So this means that I have made a bit of a boo-boo in my teenage 's system just to get the convenience of HDMI cables: swopping the 640 for the 567!
