Good Amplifier for Polk Audio LSiM 707

[KEW]

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

Yeah, where there's Pogre, trouble is not far behind.

 

[PENG]

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

Keep in mind another important point, that is, unless you have a good room for bass, tower speakers that dig deep tend to do worse with capable subwoofers. That's because they may likely interact with one another in less than perfect ways. So don't be surprised that the LSiM 707 may perform better with XO set to 80 Hz or higher, if you have capable subwoofers. Yes it seems like a waste, but very often that is the way it works when subwoofers are used.

 

[Pogre]

Keep in mind another important point, that is, unless you have a good room for bass, tower speakers that dig deep tend to do worse with capable subwoofers. That's because they may likely interact with one another in less than perfect ways. So don't be surprised that the LSiM 707 may perform better with XO set to 80 Hz or higher, if you have capable subwoofers. Yes it seems like a waste, but very often that is the way it works when subwoofers are used.

I can say that's been my experience. It seems counter intuitive, but I have very capable towers and as much as I want to use a lower crossover (and I do), anything under 120 hz I just does not give me good bass.

 

[Bin]

I can say that's been my experience. It seems counter intuitive, but I have very capable towers and as much as I want to use a lower crossover (and I do), anything under 120 hz I just does not give me good bass.

@ Peng and Pogre,
I will run room correction using Yamaha YPAO.

Usually i just go back to adjust the individual speakers crossover AFTER room correction is done, and listen using my ear/feeling . If it doesn't sound right, i will continue to adjust the crossovers up/down until i feel it's right.

Question : do you go back and RE-RUN room correction again (in my case YPAO) after all the manual crossover adjustments? I don't think so right because the room correction will RESET the crossover in all the speakers back to what the system think is right, and then i will have to back to manually adjust them...............like a never ending LOOP....haha.

 

[PENG]

@ Peng and Pogre,
I will run room correction using Yamaha YPAO.

Usually i just go back to adjust the individual speakers crossover AFTER room correction is done, and listen using my ear/feeling . If it doesn't sound right, i will continue to adjust the crossovers up/down until i feel it's right.

Question : do you go back and RE-RUN room correction again (in my case YPAO) after all the manual crossover adjustments? I don't think so right because the room correction will RESET the crossover in all the speakers back to what the system think is right, and then i will have to back to manually adjust them...............like a never ending LOOP....haha.

That is correct.

 

[Verdinut]

I can say that's been my experience. It seems counter intuitive, but I have very capable towers and as much as I want to use a lower crossover (and I do), anything under 120 hz I just does not give me good bass.

The situation with lower output from your towers at frequencies, lets say between 80 and 120 Hz, is not the result of a poor mid-bass frequency response of your speakers. It's most likely caused by your room acoustic interaction.
I believe that if you moved your towers somehow, you would get different results. As you know, the acoustics of the listening room are as important as the loudspeakers. We only have to make the best with what we have and moving speaker cabinets isn't always practical.

 

[Pogre]

The situation with lower output from your towers at frequencies, lets say between 80 and 120 Hz, is not the result of a poor mid-bass frequency response of your speakers. It's most likely caused by your room acoustic interaction.
I believe that if you moved your towers somehow, you would get different results. As you know, the acoustics of the listening room are as important as the loudspeakers. We only have to make the best with what we have and moving speaker cabinets isn't always practical.

Once it cools down a little bit I'm going to be doing some experimentation by moving my subs from the front of the room. Right now they're right next to my Towers, on the insides and I think that's part of the issue, which you allude to. This will give me more flexibility as far as pushing them a little closer together and opens things up the inside (my Towers each have 2 8-inch drivers, one on each side) for them to breathe a little better too. Finding two new spots for a pair of 15-inch subwoofers is going to be the challenging part I think. The placement of one will be almost near-field if it works there. My room is huge and odd-shaped, which doesn't make things much easier.

 

[PENG]

Once it cools down a little bit I'm going to be doing some experimentation by moving my subs from the front of the room. Right now they're right next to my Towers, on the insides and I think that's part of the issue, which you allude to. This will give me more flexibility as far as pushing them a little closer together and opens things up the inside (my Towers each have 2 8-inch drivers, one on each side) for them to breathe a little better too. Finding two new spots for a pair of 15-inch subwoofers is going to be the challenging part I think. The placement of one will be almost near-field if it works there. My room is huge and odd-shaped, which doesn't make things much easier.

Depending on the geometry of your room, there may not be much you can do about it unless you have a lot flexibility in their placements. Fortunately, you can place each sub right next to your L/R so there is no issue with localization, and since the Ultras are so bass capable, you can just turn the sub off for serious 2 channel music listening.

 

[Bin]

Depending on the geometry of your room, there may not be much you can do about it unless you have a lot flexibility in their placements. Fortunately, you can place each sub right next to your L/R so there is no issue with localization, and since the Ultras are so bass capable, you can just turn the sub off for serious 2 channel music listening.

What is a better position if you place your subs next to the tower...... Inner side or outter side of the tower?

 

[PENG]

What is a better position if you place your subs next to the tower...... Inner side or outter side of the tower?

I would think in general, whichever way gets you more space between the sub and the walls/or the towers would likely be better. Guys like Shady J, or Ed of SVS may be able to give you a more meaningful response.