Sub information - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 17 Old 06-10-2019, 08:14 AM - Thread Starter
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Sub information

Hi All,

I have read the "subwoofer" thread, it was great and I have yet to try and configure my HT yet.

I just bought a new Polk Audio HTS 12" Sub and will be installing and configuring it tonight. I will use the information in that I read in the Sub thread, but I am asking for those who have this sub if there is anything I should know.


Here is my setup:

Fronts: Polk Audio RTIA9
Center: Polk Audio CSI A6
In Celing: Polk RCI60 6.5"
rear Speakers: Nuance
AVR: Denon X4400H
TV: Samsung 65" KS8000

The issue I had before this sub was that my sub did not do a thing. I know I probably had it configured wrong.

Any information is welcome.

Thank you
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post #2 of 17 Old 06-10-2019, 09:17 AM
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Well, your towers are rated down to 18hz, which is lower than most subwoofers go.

That explains why it may have not been very noticeable. Your new sub also goes down to only 22hz, so not even as low as your towers.

It should still add more low end oomph though.

You want to make sure the sub is in phase with the towers at around 40-50hz at the MLP, that will give some constructive interference.

Use time alignment to achieve that if you can. Set the sub phase to reverse, play a 40hz tone. Sit in the MLP and adjust the T/A until you hear the tone at the most quiet.

Then flip the sub phase back to 0.

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post #3 of 17 Old 06-10-2019, 09:23 AM
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Quote:
Originally Posted by cazzo1980
… I have read the "subwoofer" thread, it was great and I have yet to try and configure my HT yet.

I just bought a new Polk Audio HTS 12" Sub and will be installing and configuring it tonight. I will use the information in that I read in the Sub thread, but I am asking for those who have this sub if there is anything I should know. …
1. Read the sub manual.
2. Hook up the sub.
3. Do a crawl (or take measurements if you have a mic+REW or an OmniMic) to find the best location(s) in which to position the sub.
4. Run Audyssey (see 'Quick 'n' dirty "How to" Audyssey' in my signature, below).
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post #4 of 17 Old 06-10-2019, 09:54 AM
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Quote:
Originally Posted by ifixtheinternet View Post
Well, your towers are rated down to 18hz, which is lower than most subwoofers go.

That explains why it may have not been very noticeable. Your new sub also goes down to only 22hz, so not even as low as your towers.

It should still add more low end oomph though.

You want to make sure the sub is in phase with the towers at around 40-50hz at the MLP, that will give some constructive interference.

Use time alignment to achieve that if you can. Set the sub phase to reverse, play a 40hz tone. Sit in the MLP and adjust the T/A until you hear the tone at the most quiet.

Then flip the sub phase back to 0.

Sent from my Pixel XL using Tapatalk
Sound&Vision review of the Polk RTi A9 shows the –3 dB point is at 49 Hz, and the –6 dB point is at 40 Hz.
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post #5 of 17 Old 06-10-2019, 09:55 AM - Thread Starter
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Quote:
Originally Posted by eljaycanuck View Post
1. Read the sub manual.
2. Hook up the sub.
3. Do a crawl (or take measurements if you have a mic+REW or an OmniMic) to find the best location(s) in which to position the sub.
4. Run Audyssey (see 'Quick 'n' dirty "How to" Audyssey' in my signature, below).
Thank you will start with those options. I don't have a mic and I will need to read up on "do a crawl" since I saw that in the subwoofer thread.

Quote:
Originally Posted by ifixtheinternet View Post
Well, your towers are rated down to 18hz, which is lower than most subwoofers go.

That explains why it may have not been very noticeable. Your new sub also goes down to only 22hz, so not even as low as your towers.

It should still add more low end oomph though.

You want to make sure the sub is in phase with the towers at around 40-50hz at the MLP, that will give some constructive interference.

Use time alignment to achieve that if you can. Set the sub phase to reverse, play a 40hz tone. Sit in the MLP and adjust the T/A until you hear the tone at the most quiet.

Then flip the sub phase back to 0.

Sent from my Pixel XL using Tapatalk
Thank you for the information. I am relatively new when it comes to HT talk and I don't know what the acronyms mean nor how to achieve them, lol.
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post #6 of 17 Old 06-10-2019, 10:02 AM
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Ok sounds like you have some reading to do.
But basically the sub crawl is where you place the sub at ear level at the listening position, play some bass tracks and crawl around the room with your head at floor level and listen for the best, most even response.

Then you place the sub there, or in the best sounding spot that works for your space.

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post #7 of 17 Old 06-10-2019, 10:50 AM
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Did you tell the receiver you had added a sub, and run Audyssey after? You'll also want to make sure you set the speakers back to 'small' with an 80 Hz crossover to start, Audyssey will probably set them to large which is not what you want.
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post #8 of 17 Old 06-10-2019, 11:29 AM
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Quote:
Originally Posted by cazzo1980 View Post
Hi All,

I have read the "subwoofer" thread, it was great and I have yet to try and configure my HT yet.

I just bought a new Polk Audio HTS 12" Sub and will be installing and configuring it tonight. I will use the information in that I read in the Sub thread, but I am asking for those who have this sub if there is anything I should know.


Here is my setup:

Fronts: Polk Audio RTIA9
Center: Polk Audio CSI A6
In Celing: Polk RCI60 6.5"
rear Speakers: Nuance
AVR: Denon X4400H
TV: Samsung 65" KS8000

The issue I had before this sub was that my sub did not do a thing. I know I probably had it configured wrong.

Any information is welcome.

Thank you
Do a sub crawl before anything else. Set crossover on sub all the way up or to bypass. Sub volume at 12 o'clock. Run audyssey. The sub trim after audyssey should ideally be between -5 & -9. Manually set all speakers to small with an 80hz crossover to start. Make adjustments to suit your preferences.
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post #9 of 17 Old 06-11-2019, 05:20 AM - Thread Starter
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Thank you all for your inputs and information. I will commence this most likely tonight. Will post my findings.

Which tracks do you recommend for bass testing?

Also, how do you guys feel about LFE+Main?

Is it better to set my speakers to small and control the bass with the crossovers or would I benefit from making my speakers large and activating the LFE+Main?

Last edited by cazzo1980; 06-11-2019 at 08:40 AM.
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post #10 of 17 Old 06-11-2019, 09:54 AM
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Do not use LFE+Main. Set speakers to small. Set crossovers to 80




65" 900E Tee Vee | Denon 6300H AVR | PSA MTM-210s | PSA MTM-210c | PSA MTM-110s | Canton 880 InCeilings | Rythmik FV25HP
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post #11 of 17 Old 06-11-2019, 11:02 AM
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Quote:
Originally Posted by javan robinson View Post
Do not use LFE+Main. Set speakers to small. Set crossovers to 80
For those of us using a web browser on a PC, you're showing this issue: https://www.avsforum.com/forum/43-fo...364-115-s.html

I agree with your advice, hard to read though it may be.
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post #12 of 17 Old 06-11-2019, 11:38 AM
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Originally Posted by bobknavs View Post
For those of us using a web browser on a PC, you're showing this issue: https://www.avsforum.com/forum/43-fo...364-115-s.html

I agree with your advice, hard to read though it may be.
Yeah, no idea why it does that. Seems to be an avs bug. Which sucks, as thats the easiest way to post for me.

Oh well

Lfe+main =NO




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post #13 of 17 Old 06-11-2019, 03:56 PM - Thread Starter
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Originally Posted by javan robinson View Post
Yeah, no idea why it does that. Seems to be an avs bug. Which sucks, as thats the easiest way to post for me.

Oh well

Lfe+main =NO
Thank you.

testing now.

I cant do a full crawl as I am moving in a month and I have boxes everywhere.

Update: After testing I have these settings:
Audyssey MultEQ XT32: ON
Audyssey Dynamic EQ: ON
Audyssey Dynamic Volume: On

Are these okay to be on? If not, how do I turn them off?

Last edited by cazzo1980; 06-11-2019 at 04:31 PM.
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post #14 of 17 Old 06-11-2019, 04:44 PM
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Quote:
Originally Posted by cazzo1980
... I cant do a full crawl as I am moving in a month and I have boxes everywhere. ...
Without at least a crawl you may end up placing the sub in a less-than-optimal location. IMO, you should do one anyway.

Quote:
... Update: After testing I have these settings:
Audyssey MultEQ XT32: ON
Audyssey Dynamic EQ: ON
Audyssey Dynamic Volume: On

Are these okay to be on? If not, how do I turn them off?
I would turn off DV and, at least initially, DEQ. Not sure what page it's on but your AVR's manual will tell you how.
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post #15 of 17 Old 06-11-2019, 05:11 PM - Thread Starter
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Quote:
Originally Posted by eljaycanuck View Post
Without at least a crawl you may end up placing the sub in a less-than-optimal location. IMO, you should do one anyway.



I would turn off DV and, at least initially, DEQ. Not sure what page it's on but your AVR's manual will tell you how.
I will need a longer cable, my current one is only 10'. Will order a 50' to be safe. My new house has a bigger basement, hence may need a longer cable.

Thanks for the advice, I DL the manual, will look it up.
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post #16 of 17 Old 06-11-2019, 05:14 PM - Thread Starter
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Quote:
Originally Posted by eljaycanuck View Post
Without at least a crawl you may end up placing the sub in a less-than-optimal location. IMO, you should do one anyway.


I would turn off DV and, at least initially, DEQ. Not sure what page it's on but your AVR's manual will tell you how.
Your quick and dirty audyssey guide was nice and I took a look at your setup, real nice my friend, huge fan of the painted black wall, looks solid.
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post #17 of 17 Old 06-12-2019, 04:13 AM
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Quote:
Originally Posted by cazzo1980
Your quick and dirty audyssey guide was nice …
Cool. Hopefully your new sub - integrated into and calibrated with your set-up - delivers what your previous sub didn't.

Quote:
… and I took a look at your setup, real nice my friend, huge fan of the painted black wall, looks solid.
Thanks!

Last edited by eljaycanuck; 06-12-2019 at 04:27 AM.
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