Polk Audio LSIM707, LSIM706, LSIM702 - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 9 Old 09-20-2019, 07:53 AM - Thread Starter
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Polk Audio LSIM707, LSIM706, LSIM702

Would it be safe to put the crossover with the receiver to 40Hz for the Polk Audio LSIM707, LSIM706 and the LSIM702 surrounds? Would I damage the speakers?



And still leave the crossover for the dual subs at 80Hz.
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post #2 of 9 Old 09-20-2019, 08:49 AM
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Why would you be doing this?

Leave it at 8 ohms and call it a day :)
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post #3 of 9 Old 09-20-2019, 09:12 AM
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if the avr settings are with speakers set to *small* ,it won't matter what the sub settings are (as long as they are set as hi or higher than the avr settings).. the speakers will handle "full range" signal fine .. that setting may not sound best to you though, plan on adjusting...

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post #4 of 9 Old 09-20-2019, 09:29 AM
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Quote:
Originally Posted by mantaraydesign View Post
Would it be safe to put the crossover with the receiver to 40Hz for the Polk Audio LSIM707, LSIM706 and the LSIM702 surrounds? Would I damage the speakers?



And still leave the crossover for the dual subs at 80Hz.
If you are running dual subs, I would crossover your speakers at 80hz.
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post #5 of 9 Old 09-20-2019, 10:01 AM - Thread Starter
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By looking at the manual for these speakers. they can handle down to 30Hz. So I thought if I set all the crossovers to 40Hz, I would get the best out of them with fuller body sound.
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post #6 of 9 Old 09-20-2019, 10:20 AM
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Quote:
Originally Posted by mantaraydesign View Post
By looking at the manual for these speakers. they can handle down to 30Hz. So I thought if I set all the crossovers to 40Hz, I would get the best out of them with fuller body sound.
That's not how it works. The crossover settings in the receiver aren't brick wall filters. They are generally 2nd order. So, if you cross your speakers at 80Hz they need to have decent output down to about 40Hz or the two won't integrate well where both are supposed to be contributing to the sound in room. So, 40Hz is not a good setting for a speaker with a F3 of 30Hz. The 707's have a F3 of 38Hz, the 706c has a F3 of 50Hz and the 702's have a F3 of 55Hz.

For an initial settings I'd suggest 80Hz for the 707's, 100Hz for the 706c, and 100 or 110Hz for the 702's. Measure and tweak from there.

Last edited by Stereodude; 09-20-2019 at 10:24 AM.
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post #7 of 9 Old 09-20-2019, 11:04 AM
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Quote:
Originally Posted by mantaraydesign View Post
By looking at the manual for these speakers. they can handle down to 30Hz. So I thought if I set all the crossovers to 40Hz, I would get the best out of them with fuller body sound.
If you have a subwoofer, I wouldn't go any lower than 60Hz. You're probably going to get fuller-bodied sound doing that rather than going down to 40Hz.

80Hz is the set-it-and-forget-it setting, and you could try that, too.

Your subs, I would set the LFE in the AVR to 120Hz, and turn the frequency knobs on the subs to max.

Home Theatre: Onkyo TX-NR747 | Polk Audio RTi A3 Front L/R | Polk Audio CSi A6 Centre | Polk Audio RTi A1 Surround L/R | HSU ULS-15 MK2 Subwoofer | Sony XBR55X900E | PlayStation 4 Pro | Xbox One S

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Last edited by Ryan Statz; 09-20-2019 at 12:28 PM.
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post #8 of 9 Old 09-20-2019, 12:14 PM
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Quote:
Originally Posted by mantaraydesign View Post
By looking at the manual for these speakers. they can handle down to 30Hz. So I thought if I set all the crossovers to 40Hz, I would get the best out of them with fuller body sound.
There are advantages in terms of distortion of your main speakers with the higher 80hz crossover.

"Win 1. Since you are now not putting in 20 Hertz 80 Hertz into the mains you are not using up the available low frequency cone movement with bass, so the low frequency cone in your main speaker is able to play its higher frequencies (up to it’s crossover point) much more cleanly. You get an apparent 6dB or more dynamic range. You can play your system louder, and also with less compression distortion in the low frequency driver...

Win 2. Since you are not putting bass into that same driver...This means cleaner mids. By far.

Win 3. You are not sucking current out of your main power amp at low frequencies, so there is more current reserve to play those highs louder.

Win 4. Since the cones are not moving as far at the low frequencies...there is far less current draw by the speakers. "

https://jlaudio.zendesk.com/hc/en-us...udio-Subwoofer

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post #9 of 9 Old 09-22-2019, 06:49 PM
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Quote:
Originally Posted by mantaraydesign View Post
By looking at the manual for these speakers. they can handle down to 30Hz. So I thought if I set all the crossovers to 40Hz, I would get the best out of them with fuller body sound.
I have those very speakers.

My Pre sets them to 40hz. I have external amplifiers to drive them with. Without subs my mains are set to Full, or Large. If I had my subs in the mix, I would have my mains at 40hz as well. If you have the grunt to drive them, by all means, set them to 40. Your Sub can be set to 120 LFE in the AVR.

Also, try them out at the all of the recommended settings, see what sounds best to you.

Set up:
Marantz AV8802A w/Pangea Premium XLR's-Source: Oppo 103-CD Player: Emotiva ERC 3 w/Pangea Premium XLR's
Display: Samsung QLED 65F-Amplification: Emotiva XPA-DR3, XPA-2 x 2
Mains: PolkAudio LSiM707, C 706, SS 702, RS RTiA9
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