Polk RTiA9 - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 14 Old 10-12-2015, 03:09 PM - Thread Starter
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Polk RTiA9

Would a Denon X4000 be strong enough to power a pair of Polk RTiA9's or LSiM705?

Already have a pair of RTiA5.
Already have the AVR-X4000.

Rated output
*THD figures are power amp stage values.
125 W + 125 W
(8 Ω/ohms, 20 Hz - 20 kHz, THD 0.05 %)

RTiA9
Electrical - Nominal Impedance 8 ohms
Electrical - Recommended Amplifier Power 50-500 watts per channel

LSiM705
Electrical - Nominal Impedance 8 ohms
Electrical - Recommended Amplifier Power 20-250 watts per channel
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post #2 of 14 Old 10-12-2015, 03:14 PM
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LSiM 705 won't have a problem.
I doubt the RTiA9 will have an issue, people like to tell you to run the A7 off an external amp all the time but it's not needed I run the A7 off a 80 watt avr and the 705 off a 150 watt avr. An amp might be needed if you play them crazy loud or sit more then 4 meters from them.
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post #3 of 14 Old 10-12-2015, 03:15 PM
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Do you have a subwoofer? And what do you find lacking with the A5?
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post #4 of 14 Old 10-12-2015, 04:36 PM
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Your Denon X4000 has plenty of power to drive either the Polk RTi or LSiM. No need to upgrade to buy external amps. The RTi is very efficient you will have no problems powering it. In fact, you can power all 7 RTiA9 without any problems in a 7.1 setup if you wanted to.
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post #5 of 14 Old 10-12-2015, 07:20 PM
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Quote:
Originally Posted by SabreWuLF_ View Post
Your Denon X4000 has plenty of power to drive either the Polk RTi or LSiM. No need to upgrade to buy external amps. The RTi is very efficient you will have no problems powering it. In fact, you can power all 7 RTiA9 without any problems in a 7.1 setup if you wanted to.
I am new so I have to ask. The Denon X400 is rated to run all 7 channels at 125, but the A9s have a max at 500. Would a 500W amp not make a difference more than a 125W internal amp of the X4000. I am sure the X4000 can "drive" the speakers, but to really open the A9s, would you not benefit from a 500W amp? I guess room size and MLP distance would come into play.
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post #6 of 14 Old 10-12-2015, 07:55 PM
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If you listen at sane levels there won't be a noticeable difference.
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post #7 of 14 Old 10-13-2015, 06:49 AM - Thread Starter
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Quote:
Originally Posted by PretzelFisch View Post
Do you have a subwoofer? And what do you find lacking with the A5?
Yes. Running two woofers in a 7.2 system.


Don't find much lacking on the A5. Just got an itch to upgrade.
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post #8 of 14 Old 10-13-2015, 08:12 AM
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Quote:
Originally Posted by soccerTOOLsu View Post
Yes. Running two woofers in a 7.2 system.


Don't find much lacking on the A5. Just got an itch to upgrade.
You'll get more clarity and maybe better detail out of the LSIM, more so than just staying on the same RTiA line. Probably your best upgrade would be a better subwoofer or acoustical room treatments.
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post #9 of 14 Old 10-13-2015, 08:40 AM
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^ I agree with Pretzel Fisch. But to answer your question...

Short answer: yes.

Long answer:
Our setup is a bit weird, the overall room is 21'x19' but only use 12'x19' as our theatre space. Hopefully this gives you an idea.
3x RTi A9 for our LCR
2x RTi A3 for front upper
FXi A6 for surrounds

Receivers driving these:
1. Onkyo TX NR 808 @ 125w
2. Onyko 808 with an Emotiva XPA [email protected] 200w,
(then the onkyo HDMI board burned out)
3. then a Denon 4520CL @150w
4. now the Denon 4520CL with the XPA-3

Overall the Denon 4520 has a more laid back sound than the Onkyo for home theatre. I just turn it up from 55 to 65 and it sounds great. I added the XPA-3 for more midbass because I run the LCR full range without a sub. I have never heard clipping in loud scenes, nor do I have a microphone to measure, but my ears tell me the XPA-3 stays louder during loud scenes than without it.

Our Old Space
New House
PSN: brotj7
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post #10 of 14 Old 10-13-2015, 09:49 AM
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Quote:
Originally Posted by lizrussspike View Post
I am new so I have to ask. The Denon X400 is rated to run all 7 channels at 125, but the A9s have a max at 500. Would a 500W amp not make a difference more than a 125W internal amp of the X4000. I am sure the X4000 can "drive" the speakers, but to really open the A9s, would you not benefit from a 500W amp? I guess room size and MLP distance would come into play.
If you can find a 500W RMS Amp into 8 ohms per channel, I'm sure there will be audible differences. People say an amp with higher Watts RMS can sound more clean, and easily hit reference level without any problems. But...an amp of that caliber is VERY expensive and can cost more than the speakers themselves. It's usually not worth putting all that money into such an amp unless you have some very expensive speakers.

Just to give you an idea of their cost: Emotiva XPR-5
https://emotiva.com/products/amplifiers/xpr-5

400 Watts RMS into 8 ohms for all 5 channels driven. $2300
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post #11 of 14 Old 10-17-2015, 05:09 AM - Thread Starter
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Wouldn't a XPA-5 be sufficient? Peak speaker power is 250W. The XPA-5 has 300W capability.




Quote:
Originally Posted by SabreWuLF_ View Post
If you can find a 500W RMS Amp into 8 ohms per channel, I'm sure there will be audible differences. People say an amp with higher Watts RMS can sound more clean, and easily hit reference level without any problems. But...an amp of that caliber is VERY expensive and can cost more than the speakers themselves. It's usually not worth putting all that money into such an amp unless you have some very expensive speakers.

Just to give you an idea of their cost: Emotiva XPR-5
https://emotiva.com/products/amplifiers/xpr-5

400 Watts RMS into 8 ohms for all 5 channels driven. $2300
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post #12 of 14 Old 10-17-2015, 07:15 AM
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Quote:
Originally Posted by SabreWuLF_ View Post
Your Denon X4000 has plenty of power to drive either the Polk RTi or LSiM. No need to upgrade to buy external amps. The RTi is very efficient you will have no problems powering it. In fact, you can power all 7 RTiA9 without any problems in a 7.1 setup if you wanted to.
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Originally Posted by soccerTOOLsu View Post
Wouldn't a XPA-5 be sufficient? Peak speaker power is 250W. The XPA-5 has 300W capability.
The XPA 5 is a much more logical choice than the XPR 5 -

Even more so, get the XPA 3.

Surrounds hardly need any power to drive. There is such little content sent to the surrounds at high levels. Your X4000 won't break a sweat driving surround speakers. You paid for the amps inside the x4000, why not use them?


You have about $2500 to play with even though you already own the receiver, and you have surround speakers.

Do you have a subwoofer? Do you plan on using a subwoofer? For $1500-$2500, you can get a front stage with much better sound quality.
What are the dimensions of your room?

If you're looking for large bass, then buying large towers are not the most efficient way to add bass to your system.

------------------------------------------------
Receiver : Denon x5200
Front Stage : L/R - Statements by Jim Holtz
Surround Speakers : Klipsch RF-82II x 4 / RP-280F x 2
Subwooferage : 6 UM18/4 HT18 Subwoofer Log

Last edited by bgtighe23; 10-17-2015 at 07:20 AM.
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post #13 of 14 Old 10-17-2015, 07:40 AM
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[QUOTE=PretzelFisch;38032209]You'll get more clarity and maybe better detail out of the LSIM, more so than just staying on the same RTiA line.

Pretzel; how do you think ur A7 overall compares to the newer 705. Other than some high end detail, can the RtiA7s hold their own & crank just as well?


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Primary set-up 5.2.4; Yamaha A2050, Paired w/Parasound P5 & ATI 522NC 2 channel amp
Revel F206 fronts & Revel M16 rears; 2 Outlaw X12 Subs & 4 RSL C34e in-ceilings

Secondary 5.1: Denon S900W, Polk LSiM703/704C, Polk RC80i in-ceiling rears, RSL Speedwoofer 10s
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post #14 of 14 Old 10-17-2015, 08:56 AM
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Quote:
Originally Posted by soccerTOOLsu View Post
Wouldn't a XPA-5 be sufficient? Peak speaker power is 250W. The XPA-5 has 300W capability.
It would be yes. But member lizrusselspike asked about a 500 Watt Amp which was why I mentioned the XPR-5 (500 Watts / channel @ 8ohm for 2 channel driven). The XPA-5 is only 200 Watts / channel @ 8 ohm. Big difference between the two, thus the major price difference.

With all that being said...the Polk RTiA9 is a very efficient speaker and the Denon X4000 has plenty of power to drive it. There's no need to buy external amps unless the user is really planning to play the speakers at extremely loud volume and want better sound quality.
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