5.1 speaker sys

[daniel49]

Technical Specifications

* Total RMS power: 70 watts RMS
o Satellites: 45 watts RMS (2 x 7.4 watts front, 15.5 watts center, 2 x 7.4 watts rear)
o Subwoofer: 25 watts RMS
* Total peak power: 140 watts
* Frequency response: 40Hz - 20kHz
* Drivers:
o Satellites: (2) 2" drivers per satellite
o Subwoofer: 5.25" ported driver
* Speaker dimensions (H x W x D):
o Satellites: 8" x 2.5" x 3"
o Subwoofer: 9" x 6" x 9.25"
* Signal-to-noise ratio: >96dB

I can see that they apparently derive 70 watts rms from adding up speaker watts but why are there two seperate ratings for power and which one is the important one.

RMS or total peak power

 

[PurdueRy]

RMS only. Peak power means nothing...well...not nothing...but nothing important to you 😉

 

[alcoholbob]

Those numbers were probably measured in interesting circumstances too. Perhaps 70W RMS at 100% THD? : P

 

[PurdueRy]

Originally posted by: Astrallite
Those numbers were probably measured in interesting circumstances too. Perhaps 70W RMS at 100% THD? : P

good point. On my brothers Panasonic Stereo/5.1 set(its basically a stereo with 5.1 capabilities) they measured it at 10%!!! LOL

Thankfully my Harman Kardon is measured as:

65 Watts per channel @ <0.07% THD, 20Hz ? 20kHz into 8 ohm

There should be a law that says manufacturers have to specify this 😉

 

[daniel49]

this:

RMS or Peak?
The difference between RMS and peak power ratings is a crucial concept for the A/V shopper to understand. Peak power ratings refer to the amount of power an amplifier produces, or a speaker can handle, for a brief musical burst ? like the crack of a kick drum. RMS power describes the amount of continuous power an amplifier produces, or a speaker can handle. The RMS power rating is always the more significant number, as it is a more accurate reflection of a component's performance in daily use.


from here:http://www.crutchfieldadvisor.com/ISEO-...reviews/20030722/mobile_standards.html

seems rms is more accurate representation?

 

[PurdueRy]

Originally posted by: daniel49
this:

RMS or Peak?
The difference between RMS and peak power ratings is a crucial concept for the A/V shopper to understand. Peak power ratings refer to the amount of power an amplifier produces, or a speaker can handle, for a brief musical burst ? like the crack of a kick drum. RMS power describes the amount of continuous power an amplifier produces, or a speaker can handle. The RMS power rating is always the more significant number, as it is a more accurate reflection of a component's performance in daily use.


from here:http://www.crutchfieldadvisor.com/ISEO-...reviews/20030722/mobile_standards.html

seems rms is more accurate representation?

yup as we said...its what to look at...but its not always reliable considering we see no test range over which that number was found...nor the total harmonic distortion...however thats sometimes the best you can do.

 

[alcoholbob]

Originally posted by: PurdueRy

Originally posted by: Astrallite
Those numbers were probably measured in interesting circumstances too. Perhaps 70W RMS at 100% THD? : P

good point. On my brothers Panasonic Stereo/5.1 set(its basically a stereo with 5.1 capabilities) they measured it at 10%!!! LOL

Thankfully my Harman Kardon is measured as:

65 Watts per channel @ <0.07% THD, 20Hz ? 20kHz into 8 ohm

There should be a law that says manufacturers have to specify this 😉

If those are amp measurements, most likely the "10%" is incorrect vendor description of 0.1% THD. 10% is greater than the peak distortion at any frequency range exhibited by a lot of loudspeakers playing at 110db.

I say this because, well you usually don't get published THD peak numbers for loudspeakers at peak power handling.

 

[PurdueRy]

Originally posted by: Astrallite

Originally posted by: PurdueRy

Originally posted by: Astrallite
Those numbers were probably measured in interesting circumstances too. Perhaps 70W RMS at 100% THD? : P

good point. On my brothers Panasonic Stereo/5.1 set(its basically a stereo with 5.1 capabilities) they measured it at 10%!!! LOL

Thankfully my Harman Kardon is measured as:

65 Watts per channel @ <0.07% THD, 20Hz ? 20kHz into 8 ohm

There should be a law that says manufacturers have to specify this 😉

If those are amp measurements, most likely the "10%" is incorrect vendor description of 0.1% THD. 10% is greater than the peak distortion at any frequency range exhibited by a lot of loudspeakers playing at 110db.

I say this because, well you usually don't get published THD peak numbers for loudspeakers at peak power handling.

nope they were speaker freq. resp. measurements 😛

 

[CrispyFried]

they also dont specify if all channels are driven, those number may be with just that channel with the others off. also no distortion specs..

"real" system specs are all chennels driven, like

xxx watts RMS per channel, all channels driven, 20-20,000 hz, .1% THD.

omit any of that and the specs are suspect.