How much should be the power of the receiver, considering the existing speakers?

[remomoreira]

I have a Sony Mutek Ddw2000 Home Theater, including the STR-DG520 Receiver.
Unfortunately, a receiver channel has been damaged, and has no repair.
I then need to replace this receiver.

These are the technical specifications of the damaged receiver, and of its speakers, which I intend to keep with me:

RECEIVER
Output power*
(6 ohms, 1 kHz, 10% THD)
Surround Mode Output (Reference) *
RMS Output
FRONT: 140 W per channel *
CENTER: 140 W per channel *
SURROUND: 140 W per channel *
SURROUND BACK: 140W per channel *

(*) Measured at 127 V AC, 60 Hz

Inputs:
Analog Sensitivity: 800 mV / 50 kohms
Digital: (Coaxial) Impedance: 75 ohms
Outputs (Analog):
AUDIO OUT Voltage: 800 mV / 10 kohms
SUB WOOFER Voltage: 2 V / 1 kohm
Tone:
Gain levels ± 6 dB in 1 dB steps
Playback frequency range: 28 - 20,000 Hz

SPEAKERS:

Front Speakers (SS-MSP16)
2 way system, 3 units, magnetically shielded
Speaker Unit:
Woofer: 160 mm, cone type × 2
Tweeter: 25mm, Horn Type
Cabinet Type Bass reflex
Nominal Impedance: 6 ohms
Dimensions (W x H x D) (Approx.): 250 × 950 × 274 mm
Weight (approx.) 14.1 kg

Center Speaker (SS-CNP16)
Speaker system: 2-way, 3-unit, magnetically shielded
Speaker Units:
Woofer: 100 mm, cone type × 2
Tweeter: 25mm, Horn Type
Cabinet Type Bass reflex
Nominal Impedance: 6 ohms
Dimensions (W x H x D) (Approx.): 514 × 174 × 223 mm
Weight (approx.) 4.9 kg

Side Surround / Rear Surround Speakers (SS-SRP16)
Speaker System: Full Range
Speaker Unit: Woofer: 100 mm, Cone Type
Enclosure Type: Bass reflex
Nominal Impedance: 6 ohms
Dimensions (W x H x D) (Approx.): 171 × 216 × 163 mm
Weight (approx.) 1.5 kg

Subwoofers (SA-WP16)
Speaker System: Active, Magnetically Shielded Subwoofer
Speaker unit: 250 mm cone type
Enclosure Type: Acoustic Volume-loaded Bass Reflex
RMS output: 165 W (6 ohms, 100 Hz, 10% THD)
Input: LINE IN (input jacks)
Power: 127 V / 220 V AC, 60 Hz
Consumption: 80 W
Dimensions (W x H x D) (approx.): 335 × 410 × 412 mm including front panel
Weight (approx.) 10.6 kg

I would like the guidance of friends here on the forum, about what should be the RMS power per channel of the receiver I shall purchase, considering the rest of the home theater, i.e. the speakers, since the new receiver will work with them.

I appreciate the help.

 

[lovinthehd]

Most avrs will have no problem with 6 ohm nominal impedance speakers. The more interesting spec might be sensitivity so you can determine necessary amp power for the speakers at the levels you listen with your distance from the speakers; if you find a max continuous or peak wattage spec that's only so much help as it's not a standardized spec and is mostly a melting point. You can try using this calculator to help get an idea of amp needs if you can find a sensitivity spec for the speakers (sub has it's own power, i.e. it's an active sub, and most modern avrs do require such). http://myhometheater.homestead.com/splcalculator.html

 

[Kvn_Walker]

Advertising that receiver at 10% THD (at 1kHz no less!) makes me want to puke.

Any well-built receiver that can push an honest 80 or 90 watts x 5 will replace it beautifully.

 

[lovinthehd]

Advertising that receiver at 10% THD (at 1kHz no less!) makes me want to puke.

Any well-built receiver that can push an honest 80 or 90 watts x 5 will replace it beautifully.

Who says its not a well built receiver? It seems a typical avr, and in some ways better than other HTIB avrs. Why is an ACD rating of 80 or 90wpc that important? It's two channel ratings is 90wpc at 20hz-20khz, .09% THD in any case, aside from their advertised numbers (the spec is from the manual).

 

[Kvn_Walker]

Who says its not a well built receiver? It seems a typical avr, and in some ways better than other HTIB avrs. Why is an ACD rating of 80 or 90wpc that important? It's two channel ratings is 90wpc at 20hz-20khz, .09% THD in any case, aside from their advertised numbers (the spec is from the manual).

??? I never said the Sony was bad. I just said a well-built unit with essentially the same amount of clean power would be a perfect substitute. My only disgust was at using a 10% THD output for "BIG NUMBERS" marketing purposes... the very thing Gene was petitioning last month.

 

[lovinthehd]

??? I never said the Sony was bad. I just said a well-built unit with essentially the same amount of clean power would be a perfect substitute. My only disgust was at using a 10% THD output for "BIG NUMBERS" marketing purposes... the very thing Gene was petitioning last month.

This whole "clean power" thing is as misleading as the inflated high THD spec for marketing....it's meaningless really. Better to refer to a spec you can compare. Marketing people are what they are. So you're essentially saying if he replaced it with a similar unit to what he has amp-wise, he's fine with the current speakers? He's also considering new speakers in another thread, so might be best to settle on speakers first in any case....

 

[AcuDefTechGuy]

Around 100WPC-8ohm or more is usually good.

Something like a Yamaha RX-A1070/1080 or Denon X3400/3500/3600 or higher is good.

 

[davidscott]

Advertising that receiver at 10% THD (at 1kHz no less!) makes me want to puke.

Any well-built receiver that can push an honest 80 or 90 watts x 5 will replace it beautifully.

Agreed. I wonder what the THD is at the frequency extremes?

 

[lovinthehd]

For his current avr I posted the 20hz-20khz rating, .09% at 90wpc 2ch driven (from his avr's manual).

Agreed. I wonder what the THD is at the frequency extremes?

 

[davidscott]

For his current avr I posted the 20hz-20khz rating, .09% at 90wpc 2ch driven (from his avr's manual).

Sorry didn't see that thanks. Those are pretty good specs.