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amp (or receiver) recommendation for Polk Audio RTi A7 floorstanding speakers

I started off building a 7.1 home theater system. Based on advice received here, I changed my plans. I'm re-purposing some of my components to a dedicated music system in another room. I would like some advice on this music system. (I'm keeping the home theater system in the smaller room and using smaller speakers with it.)

I am looking for a music system that will give me smooth, sweet, soft, silky treble with instruments like the Indian sitar or sarangi. These instruments can be challenging. I hope the system also has clarity and detail and enough punch for alternative rock in a large room.

I have two possibilities for listening location. One room is 18 feet x 22 feet with a tile floor, floor to ceiling windows on back wall and 8 foot ceiling. The front wall has a book case.

The other possible room is about 25 feet x 40 feet with a vaulted ceiling (approx 16+ feet at center). Back wall is also mostly glass. Flooring will be wood soon, but for now it is carpet. Neither room has curtains (or any window treatments) over the windows.

My old room was 11.5 feet x 11.5 feet and these speakers were too much for that small space (along with a large TV).

Let's assume I can arrange either new room so that my listening position and the speaker placement closely conforms to the "golden ratio" (http://www.ecoustics.com/articles/stereo-speaker-placement-optimum-sound/).

Here are the components I already own and would like to use:

  • pair of Polk Audio RTi A7 floorstanding speakers (8 ohms) - Sensitivity (1 watt @ 1 meter): 89 dB. Recommended Amp Power Per Channel: 20 watts → 300 watts
  • pair of Polk Audio RTi A5 floorstanding speakers (8 ohms) - Sensitivity (1 watt @ 1 meter): 90 dB. Recommended Amp Power Per Channel: 20 watts → 250 watts
  • Klipsch RP-250C Center Channel Speaker (probably won't use)
  • Klipsch R-112SW Subwoofer 600 W, powered
  • LG UP875 4K BLU-RAY PLAYER (plays audio CDs) (features HDMI, USB, and optical digital audio output)
  • computer with Asus X99 Deluxe II motherboard featuring Crystal Sound 3 audio (https://www.asus.com/us/Motherboards/X99-DELUXE-II/) (features USB, HDMI or optical S/SPIF output)
  • Focusrite Scarlett 6i6 USB audio interface (if needed) (https://us.focusrite.com/usb-audio-interfaces/scarlett-6i6)

Music will be played from my computer or the LG UP875 disc player.

What I have in mind is a 2.1 system with TWO pairs of front speakers (4 speakers total). I tried a dual front speaker setup briefly and I liked it, although I understand it is unconventional. But I have the speakers and I would like to try using them all. (If that is a really bad idea, even in a larger room, I'll give up on it.)

Also, I am curious to try bi-amp'ing and the speakers support it. If I use dual front speakers and bi-amp them 8 powered channels are required.

In a smaller room, I would not need a subwoofer with these front speakers. I don't know how that will turn out in a larger room. I don't listen to bass boosted music. But I assume I'll need a subwoofer. I assume I will not use the center channel speaker at all. I can return it.

Here's what I anticipate I'll need:

  • something with an amplifier
  • something with a sub out for the subwoofer
  • something to connect everything together (and, I guess, let me choose between the disc player and computer as sources)

What I do *not* need from the new components:
  • analog input sources
  • streaming, WiFi or networking (other than what I do with the computer)
  • home theater features or video support
My budget is about $1000, although I have some flexibility. But I only have about $2300 invested in the other components (not counting the center speaker, which I won't use, or the computer which is multi-purpose). So it doesn't seem to make sense to spend a whole lot more.

I am new to audio and home theater. I'm just learning now and I want to gain some experience before I increase my budget too much. Later, if I purchase much more expensive speakers, I'll get a more expensive preamp / amp combo. In my (limited) understanding the heart of an audio system -- where the money should be spent -- is the speakers and the amp. But with my most expensive speakers (the A7's) being $600/pair, it seems unreasonable to spend more than $1000 on a preamp+amp / integrated amp / stereo receiver (whichever is recommended) for this setup. If my logic is wrong, I guess I could be talked into increasing the budget to $2000 or so.
lowoverdrive
lowoverdrive OP
169 posts
 
" even a modest stand-alone DACs like the myDAC will be superior to the one in most computers. "

How does the Focusrite Scarlett 6i6 compare to myDAC?
https://us.focusrite.com/usb-audio-interfaces/scarlett-6i6

I already own the 6i6. It's designed for a different purpose, but it seems to work really well as a DAC.
willemj
1,036 posts
 
Ah, you already own a decent usb etc DAC, at least that is what I understand the Focusrite to be (amongst a lot of other things)? Is that what I think it is? That makes it a lot cheaper, because all you perhaps need is an additional volume control in between the DAC and your great power amp (but from what I can see the Focusrite also has a volume control). With your beefy power amp I would suggest perhaps a basic analogue volume control as well, or for now perhaps some inline attenuators (plus a low setting of the gain controls on the power amp to avoid damage to your speakers): http://www.tcelectronic.com/level-pilot/
The only snag I can see is that your DAC has an rca output and the Level Pilot and the power amp have balanced xlr inputs. But there are cables to deal with that, and they are not even expensive (my son needed one too). Don’t get suckered into expensive cables.
All in all and for now I would not buy an extra DAC. I think you are done.
lowrider57's avatar
lowrider57
5,393 posts
 
If you stay with the Yamaha P5000S, you’ll have a monster of an amp that you can keep while making future upgrades to your system. But be aware that since it is a pro audio component and uses balanced XLR and 1/4" connections, you may need to use adapters depending on what other components you buy.

I think using your Focusrite Scarlett 6i6 is a good move for now; this will save you some money. Once again, this unit uses XLR and 1/4" connections.
Analog Outputs: 4 x 1/4" (line out)... not typical in a home audio setup.

So now that I have opened that can of worms, what shall I pair the P5000S with? I hope I didn’t make a mistake here because I do not yet see the preamp that seems to meet my needs / budget.
There’s the rub. You should be looking for a balanced preamp with XLR in/out plus RCA for flexibility. You will need to use 1/4" to XLR adapters to hook up your DAC to the preamp. I don’t think you should go with a pro audio preamp since this is the component that acts as the controller for the entire system. It should be able to accept different types of components; i.e., your next DAC or streamer may only use RCA outputs.

And before you make a purchase, it’s vital that the impedance and gain specs are compatible with the amp. So seek advice first.

lowoverdrive OP
169 posts
 
willemj - "Focusrite - Is that what I think it is?"

Yes, I think so... I already use the Focusrite Scarlett 6i6 with my computer and a set of powered speakers (Logitech Z623). Going from that to a power amp with unpowered speakers seems like it should work, right?

The Focusrite Scarlett does indeed have a volume control.

willemj - "All in all and for now I would not buy an extra DAC. I think you are done."

I will at least try this approach and see how it goes. I'm pretty excited about it. I like the idea of buying one new piece of equipment and seeing what existing equipment I can re-use to come up with something that works. I'll learn from this and then I'll have a better idea what I want to try next.

In summary this is the next step I'll be trying:

A room of about 20 feet x 30 feet with a vaulted ceiling (approx 16+ feet at center) and a lot of open space. (I had the measurements wrong earlier.)

The components list:


First question - the A7 speakers are recommended with up to 300 watts and the Yamaha P5000S puts out more than that. What precautions should I take? Is it as simple as not turning the volume up too high?

Second question - how is the subwoofer connected to the Yamaha P5000S?

Third question - any tips on the settings for the subwoofer?

Thanks




lowrider57's avatar
lowrider57
5,393 posts
 
During a typical listening session your amp will be putting out a very low wattage, maybe 10 wpc. With your large room, it would be higher, but never approaching 300 watts continuously.

The 300 watt spec is for the nominal amount. The speaker can take momentary peaks much higher than the rated 300 watts.
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