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SONY Is it really true?
SONY Is it really true?
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Old 4th June 2012, 12:33 PM   #1
charlestpt is offline charlestpt  India
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Default SONY Is it really true?

SONY stated its total power rating is 1000watt RMS
I can't believe this is it really true

DAV-DZ340K : DVD Home Theatre System : Home Theatre System : Sony India
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Old 4th June 2012, 12:46 PM   #2
Alvis is offline Alvis
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Probably not.

Home Theater testing is not the same as the old way for 2 channel stereos.

Example: Let's say they test one channel to ~200wpeak.
First of all, the 200w is not usable clean sound.
Second and far more important, they only have to test one channel at a time, not six. It is a loop hole.

Back when 2 Channel stereo amps were more common, they all had to go under regulated tests, or risk being pulled from the shelves. AFAIK it is still this way for 2channel. "Home theater" and all others do not follow under these guidelines.

Even if it was true, is it really all that impressive for an amp with 6 channels?

You need to find out what it has for a power supply, that may give you a better picture.
In most cases you realize the power supply is not strong enough to power ALL the channels to full power, just one at a time for "testing".

I suppose even Sony has to do this to stay competitive with other advertisers.
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Old 4th June 2012, 12:56 PM   #3
chris661 is offline chris661  United Kingdom
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I'm fairly sure it'll stand 2 channels driven, in keeping with the requirements for stereo amplifiers.

Next up, the power figures are usually at 10% distortion. This is way past listenable - you could probably half those power ratings and get something much closer to the truth.

... the puny satellites won't stand much power either, so its lucky that the amplifiers don't put much out.

It's all seriously over-rated, fairly typical of average Joe sound systems.
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Old 4th June 2012, 12:58 PM   #4
Nico Ras is offline Nico Ras  South Africa
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It certainly is possible, but not all at one time. They do not say all channels driven, so each channel on its own could be capable of outputting the claimed 170 watt, therefore they are not lying.
Kindest regards
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Old 4th June 2012, 03:49 PM   #5
Osvaldo de Banfield is offline Osvaldo de Banfield  Argentina
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I donīt believe it is true. Here in Argentine, it is common to use the acronym PMPO (peak maximum power output???), and the true is that this value divided 300 is the real power at the speaker, in my experience measuring equipment in the Philco of Argentina several years ago. In example, a set of announced 1500W PMPO is really a 5-7W/channel at 10% THD. It is sufficient to see the rear of the speaker, and or the size of the heatsinks of the output stage, or the transformerīs weight.
Osvaldo F. Zappacosta. Electronic Engineer UTN FRA from 2001.
Argentine Ham Radio LW1DSE since 1987.
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Old 4th June 2012, 04:31 PM   #6
jitter is offline jitter  Netherlands
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Download the manual from Sony India and look at the specs. Quite creative:

Brazilian models:
all channels except subwoofer (SW): 142 W/ch @ 3 Ohms, 1kHz/10% THD;
SW: 140 W @ 3 Ohms, 80 Hz/10% THD.

Other models (rated):
all channels except subwoofer (SW): 108 W/ch @ 3 Ohms, 1kHz/1% THD;
SW: not specified

Other models (reference):
all channels except subwoofer (SW): 167 W/ch @ 3 Ohms, 1kHz/THD not specified);
SW: 140 W @ 3 Ohms, 80 Hz/THD not specified.

No specification of the measurement method. Also, the nominal impedance of the speakers doesn't seem to be specified.

The power consumption is rated at 160 W. I assume that is max. power consumption. Based on this I assume that the amp power ratings are peak power and not continuous power.
My guess... about 25 W continous power into 3 Ohms, maybe 10 W into 8 ohms per channel...
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Old 4th June 2012, 04:34 PM   #7
RJM1 is offline RJM1  United States
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Going from it's weight from the spec. sheet I'd say no. Main Unit Weight Approx. 3.5kg spec sheet DAV-DZ340K : DVD Home Theatre System : Home Theatre System : Sony Asia Pacific And the spec sheet does say RMS power. It's not taking my carriage returns, It's just running my words together!

Last edited by RJM1; 4th June 2012 at 04:49 PM.
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Old 4th June 2012, 05:07 PM   #8
charlestpt is offline charlestpt  India
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The size of those speakers are of 4 inches would they with stand 167W RMS power?
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Old 4th June 2012, 05:11 PM   #9
Frank Berry is offline Frank Berry  United States
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Total power consumption of 160 watts says it all.
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Old 4th June 2012, 05:36 PM   #10
CBS240 is offline CBS240  United States
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They cheat. By using a seperate sub, they cut the bandwidth of all the other amplifiers. It requires much more headroom to have all the frequencies in one amplifier channel, that is a full bandwidth speaker cabinet with a crossover network showing a highly reactive load. I find it is harder to correctly put the signal back together after seperating it in such a way, it depends on your position relative to the speakers. I guess that is why they need a bunch of fancy signal processing. I'd say build a better amp, like they use to back in the day when Sony meant a quality product, but then I don't work for Sony.
All the trouble I've ever been in started out as fun......
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