can this avr handle these speakers? - AVS Forum
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post #1 of 13 Old 01-06-2012, 09:50 PM - Thread Starter
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I want to run Definitive Technology UIW RLS III in walls with my onkyo tx-nr609. Is it possible?

specs:

Definitive Technology UIW RLS III

Driver Complement :One 1" pure aluminum dome tweeters; Two 5-1/4" cast-basket bass/midrange drivers pressure coupled to two 5-1/4 bass radiators
Frequency Response :24 Hz - 30 kHz
Impedance :Compatible with 8 Ohm outputs
Sensitivity :92 dB
Recommended Associated Amplifier Power :10 - 325 watts
A/V Receiver Crossover Setting :60 Hz
Inputs :One pair of gold plated spring loaded posts


onkyo 609:

http://www.us.onkyo.com/model.cfm?m=...s=Receiver&p=s
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post #2 of 13 Old 01-06-2012, 10:23 PM
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Stereo? 5.1 system? Other? Distance from speaker(s) to main listening position? How loud do you want it in db? Are you crossing over to sub(s)? If so, at what frequency?
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post #3 of 13 Old 01-06-2012, 10:59 PM
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Short answer? Yes.

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post #4 of 13 Old 01-07-2012, 07:23 AM
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The only spec that matters there is the Sensitivity; any amplifier over 20 watts will run speakers with that high 92db/watt sensitivity.




Quote:
Originally Posted by skichiiwa View Post

I want to run Definitive Technology UIW RLS III in walls with my onkyo tx-nr609. Is it possible?

specs:

Definitive Technology UIW RLS III

Driver Complement :One 1" pure aluminum dome tweeters; Two 5-1/4" cast-basket bass/midrange drivers pressure coupled to two 5-1/4 bass radiators
Frequency Response :24 Hz - 30 kHz
Impedance :Compatible with 8 Ohm outputs
Sensitivity :92 dB
Recommended Associated Amplifier Power :10 - 325 watts
A/V Receiver Crossover Setting :60 Hz
Inputs :One pair of gold plated spring loaded posts


onkyo 609:

http://www.us.onkyo.com/model.cfm?m=...s=Receiver&p=s

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post #5 of 13 Old 01-07-2012, 09:54 AM - Thread Starter
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Quote:
Originally Posted by commsysman View Post

The only spec that matters there is the Sensitivity; any amplifier over 20 watts will run speakers with that high 92db/watt sensitivity.

Sorry so if I want to run any more then the speakers I will need an amp? Also is it better to buy an amp or more powerful avr?
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post #6 of 13 Old 01-07-2012, 10:29 AM
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An AVR is much more efficient.

An AVR with 'pre-outs' leaves you the OPTION of using external power-amps.

Based on your questions, I wouldn't worry about external amps unless you're the kind of person who buys a Hummer to cruise the mall.

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post #7 of 13 Old 01-07-2012, 10:48 AM
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Quote:
Originally Posted by cavu View Post

Based on your questions, I wouldn't worry about external amps unless you're the kind of person who buys a Hummer to cruise the mall.

Or unless you are planning to set your HT system up in a giant cavern

The Onkyo TX-NR609 has good reviews and has plenty of output for the average HT system. You'd have to spend substantially more money to do better, and you might not notice any difference.

Your questions are answered: Speaker FAQ
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post #8 of 13 Old 01-08-2012, 11:12 AM - Thread Starter
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interesting points. thank you all but i still don't know if it can handle those speakers plus more. am i reading into this too much?

thank you
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post #9 of 13 Old 01-08-2012, 11:47 AM
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Quote:
Originally Posted by skichiiwa View Post

if I want to run any more then the speakers I will need an amp?

So I re-read your question but have no idea what you are asking!!

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post #10 of 13 Old 01-08-2012, 01:13 PM
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Quote:
Originally Posted by skichiiwa View Post

Sorry so if I want to run any more then the speakers I will need an amp? Also is it better to buy an amp or more powerful avr?

The NR609 could handle 7 of those Def Tech speakers if you had them. 92db sensitivity and 8ohms isn't tough to power at all.

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post #11 of 13 Old 01-08-2012, 03:38 PM
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It depends on the OPs desired SPL and listening distance. Without that information all opinions are meaningless. The OP should consult an online power requirement calculator.
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post #12 of 13 Old 01-08-2012, 04:29 PM
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Quote:
Originally Posted by UtahPaul View Post

It depends on the OPs desired SPL and listening distance.

OK, let's deal with distance, multiple speakers and reflected power.

I'll make the assumption that the OP wants to generate THX standard levels of 85dB SPL average and 105dB SPL peak. I'll present two scenarios which will likely cover the OP's situation.

A. The listener is in the centre of a room with a 5.1 speaker array placed around the outside of the room, 10ft distant from the listening position.

Let's ignore the sub-woofer for the moment and apply pink noise at 0.2w to all remaining 5 speakers (each with 92dB efficiency), the following calculations could be made:

Each speaker will produce 85dB SPL @ 1m
  • We will lose 9.7dB per speaker due to the distance the listening position (10ft)
  • We will gain 7dB from the multiple (5) speakers
  • We will gain 3dB from reflected sound in the room
  • The sound pressure level at the listening position will be 85.3dB SPL, exceeding the THX average requirement.

Let us do the same but at 20w per speaker:

Each speaker will produce 105dB SPL @ 1m
The math is the same:
  • We will lose 9.7dB per speaker due to the distance the listening position (10ft)
  • We will gain 7dB from the multiple (5) speakers
  • We will gain 3dB from reflected sound in the room
  • The sound pressure level at the listening position will be 105.3dB SPL, again exceeding the peak spec.

If the OP was using a 7.1 system, the SPL level in the two above cases would be 1.45dB SPL louder ... 86.75dB and 106.75dB respectively.


B. Sitting 20ft away from the speakers will require more power:

The loss per speaker for the additional 10ft to the listening position would be another 6dB so you would have to have 0.744w/ch to produce 85dB SPL at the listening position with a 5.1 system and 74.4w/ch to produce 105dB SPL.

Using a 7.1 system, the power requirements to meet THX standard levels would be 0.53w/ch and 53.14w/ch respectively.

So, in summary, as I stated in post #3, "Short answer? Yes."

This AVR (with 100-ish w/ch) will handle those speakers (unless the OP is operating outdoors or in a gymnasium) with headroom left over.

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post #13 of 13 Old 01-09-2012, 03:04 PM - Thread Starter
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Quote:
Originally Posted by cavu View Post

OK, let's deal with distance, multiple speakers and reflected power.

I'll make the assumption that the OP wants to generate THX standard levels of 85dB SPL average and 105dB SPL peak. I'll present two scenarios which will likely cover the OP's situation.

A. The listener is in the centre of a room with a 5.1 speaker array placed around the outside of the room, 10ft distant from the listening position.

Let's ignore the sub-woofer for the moment and apply pink noise at 0.2w to all remaining 5 speakers (each with 92dB efficiency), the following calculations could be made:

Each speaker will produce 85dB SPL @ 1m
  • We will lose 9.7dB per speaker due to the distance the listening position (10ft)
  • We will gain 7dB from the multiple (5) speakers
  • We will gain 3dB from reflected sound in the room
  • The sound pressure level at the listening position will be 85.3dB SPL, exceeding the THX average requirement.

Let us do the same but at 20w per speaker:

Each speaker will produce 105dB SPL @ 1m
The math is the same:
  • We will lose 9.7dB per speaker due to the distance the listening position (10ft)
  • We will gain 7dB from the multiple (5) speakers
  • We will gain 3dB from reflected sound in the room
  • The sound pressure level at the listening position will be 105.3dB SPL, again exceeding the peak spec.

If the OP was using a 7.1 system, the SPL level in the two above cases would be 1.45dB SPL louder ... 86.75dB and 106.75dB respectively.


B. Sitting 20ft away from the speakers will require more power:

The loss per speaker for the additional 10ft to the listening position would be another 6dB so you would have to have 0.744w/ch to produce 85dB SPL at the listening position with a 5.1 system and 74.4w/ch to produce 105dB SPL.

Using a 7.1 system, the power requirements to meet THX standard levels would be 0.53w/ch and 53.14w/ch respectively.

So, in summary, as I stated in post #3, "Short answer? Yes."

This AVR (with 100-ish w/ch) will handle those speakers (unless the OP is operating outdoors or in a gymnasium) with headroom left over.

whoa. thanks for the detail . IM no more then 10 feet from the wall they will go into. I'm also in a great room( living and kitchen in 1). so it is big.however, IM probably going to do 3.1 system maybe 5.1 but never 7.1.

thanks for all the detail. Greatly appreciated.
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