Good Amplifier for Polk Audio LSiM 707

[strwere]

any one guys recommend an amplifier for this i just bought 2 of these in best buy for $770 each my only budget for stereo speaker is only $2000 i hook up in my sony avr the volume is 100% already still to silent.

 

[WaynePflughaupt]

The specs don’t show that they’re a difficult speaker. Any decent receiver with 100 watts per channel should do them justice. What is that Sony from, a “home theater in box” system?

Regards,
Wayne A. Pflughaupt

 

[shadyJ]

Any Sony AVR should power these to decent loudness levels. If they are silent or quiet, something else is going on. Your problem lies elsewhere.

 

[Kvn_Walker]

What's the Sony model number? We can take it from there.

 

[everettT]

From Brent Butterworth:
The tower is the toughest load, hitting a minimum impedance of 2.8 ohms at a low frequency of 66 Hz with a fairly reactive phase angle of -32°. That’s enough to cause some inexpensive receivers to shut down if you crank up the volume, but I think a typical mid-to-high-end receiver (say, $1,500+) or any good stereo amp should handle it fine.
Read more at https://www.soundandvision.com/content/test-report-polk-audio-lsim-speaker-system-page-3#gWiiyjmAbKZV8VUZ.99

 

[lovinthehd]

Does your Sony avr have pre-outs to use an external amp with?

 

[PENG]

any one guys recommend an amplifier for this i just bought 2 of these in best buy for $770 each my only budget for stereo speaker is only $2000 i hook up in my sony avr the volume is 100% already still to silent.

It would be easier for anyone to recommend an amplifier if you tell us the following:

- Your seating distance.
- Approx. room dimensions, WXLXH
- The sound pressure level you desire, do you need it as loud as you hear in a movie cinema and/or live concerts in a concert hall.
- How many channel is your AVR powering now?
- Models of the other speakers.
- Are you using a subwoofer?

You may also try an online calculator such as the one linked below:

http://myhometheater.homestead.com/splcalculator.html

If you don't want to figure it out your real need, then just go ahead and add an external power amp rated 300 W/4 ohms, for those 2 speakers but make sure your AVRs have preouts and the power amplifier has higher enough gain, say 29 dB or higher.

 

[strwere]

Sorry guy for the very late reply im too busy this past few days. I found out that the avr i use is already broken i tried it in my other stereo speaker, Im not a audiophile person all i want is crisp music with a punch I only purchase this kind of speaker because its on sale.

I read some review of this

Onkyo A-9110 2.0 Channel Integrated Amplifier

and this one

Onkyo TX-NR686

what do you think guys is better?

or can you guys recommend a good amplifier for this one without breaking my walet maybe around $500 below

 

[Kvn_Walker]

Dang looks like the b-stock Outlaw 2200s are all gone. Quite a few members here (including myself) have those and they're all you could ever want for just about any speaker.

Could also look into the Crown XLS amps. Tons of power, they can handle just about any load, and quite inexpensive.

 

[Bin]

I have exactly the same question.
My room size is a L shape , around 500-600sq but with a really high ceiling.

Current system 5 SvS satellite speakers with 2 PB1000, powered by Yamaha 8710.

There is a great deal currently so I just grabbed 2 Polk LSIM 707 towers and a 706c centre. Spec power rating from 20-300 W for the tower and 20-250w for the center.

Now I swap out the 5 satellite and plan to just run the 3 front Polk with dual pb1000.
Current Yamaha 8710 spec indicates 95w/ channel for 2 channels. Will this AV make the Polk underperform?

Or do I need to add a 2 or 3 channels amp that have 200w/channel on 8ohm to make Polk sing lively?

 

[Pogre]

From Brent Butterworth:
The tower is the toughest load, hitting a minimum impedance of 2.8 ohms at a low frequency of 66 Hz with a fairly reactive phase angle of -32°. That’s enough to cause some inexpensive receivers to shut down if you crank up the volume, but I think a typical mid-to-high-end receiver (say, $1,500+) or any good stereo amp should handle it fine.
Read more at https://www.soundandvision.com/content/test-report-polk-audio-lsim-speaker-system-page-3#gWiiyjmAbKZV8VUZ.99

Yeah, I think he determined they were 5 ohm nominal iirc. Might be tough on a smaller receiver.

 

[lovinthehd]

I have exactly the same question.
My room size is a L shape , around 500-600sq but with a really high ceiling.

Current system 5 SvS satellite speakers with 2 PB1000, powered by Yamaha 8710.

There is a great deal currently so I just grabbed 2 Polk LSIM 707 towers and a 706c centre. Spec power rating from 20-300 W for the tower and 20-250w for the center.

Now I swap out the 5 satellite and plan to just run the 3 front Polk with dual pb1000.
Current Yamaha 8710 spec indicates 95w/ channel for 2 channels. Will this AV make the Polk underperform?

Or do I need to add a 2 or 3 channels amp that have 200w/channel on 8ohm to make Polk sing lively?

Hard to know what you mean by underperform or sing lively. If you mean higher volume levels, possibly your avr is on the weak side.

 

[Bin]

Hard to know what you mean by underperform or sing lively. If you mean higher volume levels, possibly your avr is on the weak side.

Yes that's what meant......I haven't receive the Polk speakers yet... But looking at the spec of this AV, I am not sure if it's enough to power the 3 front speakers set up since the speakers power rate from 20 to 300w but AV only indicates 95w/ channel for 2 channels

 

[lovinthehd]

Yes that's what meant......I haven't receive the Polk speakers yet... But looking at the spec of this AV, I am not sure if it's enough to power the 3 front speakers set up since the speakers power rate from 20 to 300w but AV only indicates 95w/ channel for 2 channels

The speakers will work with 20w, 95w should be fine for usual listening levels, it's when you go into very high spls the amp section may prove a bit weak on its own; assuming you meant the 7810 rather than 8710 you have the option of adding a power amp if you feel the power is insufficient for your purposes. Try it with the avr alone for a while....then decide if you need more amplification. Might play around with this spl calculator to get an idea of your needs http://myhometheater.homestead.com/splcalculator.html

 

[Kvn_Walker]

@everettT

It's nice to see you back. It had been quite awhile since your last posts. I presume you are still enjoying the performance of the DCA 1222.

You were replying to a post from February.

 

[PENG]

Yes that's what meant......I haven't receive the Polk speakers yet... But looking at the spec of this AV, I am not sure if it's enough to power the 3 front speakers set up since the speakers power rate from 20 to 300w but AV only indicates 95w/ channel for 2 channels

It depends on your seating distance and how loud you listen. I highly recommend you used the calculator I linked in post#7 before you shop for a new AVR or AVR+power amp.

On paper, I would consider those speakers tough to drive, even just based on that linked S&V review. If you sit 10 ft or farther and want reference level you probably should return them or you are going to be shopping for very capable power amps and an AVR or AVP that has high enough clean pre out voltage.

If you sit 8, or even 10 ft, but are happy with 5 dB or more below reference level (loud enough for a lot of people), then any mid range AVR can do a decent job as long as you set the XO for the LCR to 80 Hz or higher.

More S&V measurement data are available in the linked below, it looks like an extended part of the same one linked in post#5 by everettT.

https://www.soundandvision.com/content/polk-lsim707-surround-speaker-system-ht-labs-measures

 

[Verdinut]

You were replying to a post from February.

I didn't notice but I was mislead by Pogre's yesterday's post.

 

[Bin]

It depends on your seating distance and how loud you listen. I highly recommend you used the calculator I linked in post#7 before you shop for a new AVR or AVR+power amp.

On paper, I would consider those speakers tough to drive, even just based on that linked S&V review. If you sit 10 ft or farther and want reference level you probably should return them or you are going to be shopping for very capable power amps and an AVR or AVP that has high enough clean pre out voltage.

If you sit 8, or even 10 ft, but are happy with 5 dB or more below reference level (loud enough for a lot of people), then any mid range AVR can do a decent job as long as you set the XO for the LCR to 80 Hz or higher.

More S&V measurement data are available in the linked below, it looks like an extended part of the same one linked in post#5 by everettT.

Thanks for your reply, I will use the calculator later this week.
But also I will try out my current AVR first, if everything goes well then will not shop around just yet .

Right now with my current satellite speakers and dual pb1000...I crossed them at 100Hz, and my AVR volume always played around -40 to -28 (most of the time played at -36).

 

[PENG]

Right now with my current satellite speakers and dual pb1000...I crossed them at 100Hz, and my AVR volume always played around -40 to -28 (most of the time played at -36).

As HD asked, when you said 8710, did you mean 7810?

If it is, volume -28 isn't very loud so you should be okay even with those hard to drive LSiM speakers but do set XO to 100 first. Even that works well then try 90 or even 80 but don't go below that until you are sure you are good with volume at -28, or even -20. If you listen reasonably loud, those speakers won't sound good without a much more powerful amp than those little ones in an entry level AVR.

 

[Bin]

As HD asked, when you said 8710, did you mean 7810?

If it is, volume -28 isn't very loud so you should be okay even with those hard to drive LSiM speakers but do set XO to 100 first. Even that works well then try 90 or even 80 but don't go below that until you are sure you are good with volume at -28, or even -20. If you listen reasonably loud, those speakers won't sound good without a much more powerful amp than those little ones in an entry level AVR.

Awesome, thanks for the quick response.
Yup I meant Yamaha 7810 model (sorry about the typo). And yes with this new towers and center, I plan to xo then at 80Hz since the have good size drivers and woofers.

If it allows I might xo then lower to 60Hz, but that might require me add a power amp later...... But that's for maybe a few months later, researching a 2 or 3 channels power amp that capable of 200w/c