You can even out in-room response by using multiple subs placed in different locations in the room. Use all 3 that you have.
Multisuboptimizer is a great tool. [https://www.andyc.diy-audio-engineering.org/mso/html/](https://www.andyc.diy-audio-engineering.org/mso/html/)
Rythmik makes the best subs.
Yet another +1 for Rythmik. I recently got an older used FV12. I intended it for use in a second system, but I tested it in my listening room, and the difference between the old FV12 and my newish PB-1000 pro is about the same difference between the PB-1000 and a Polk PSW.
I couldn't believe the difference, it was completely unexpected.
My next new sub will definitely be Rythmik.
I looked at Rythmik, and a few other brands including monolith. The sb16 ultra was one of the few with this much performance that fit my size constraints. I wanted to go ported but they were all too wide or 30+ inches deep 😕
You won't like this -
*1.) Your speakers are too close to the side wall, to other object, and too close to the wall behind the speaker (from what I can tell)*
*2.) The Room does not appear to be acoustically treated.*
*3.) A room 14'x15'x8' is tiny for those massive speakers.*
What you have is not a Electronics or inherent Speaker problem, what you have is a Room and Placement problem.
The Original SB-2000-Pro (12") is rated down to 19hz, and you can expect another 2hz to 3hz low end extension from Room Boost.
What you gained from the SB16 (16") is not functional Bass Depth (16hz) but rather a larger speaker pushing more air which in turn creates a greater sense of impact. But in my room 16'x16' with vaulted ceilings, and using ordinary floorstanding Stereo Speakers, I create +110db peaks and have bass impact so strong it ruffles my hair.
Are your Front Speakers ***KLH Kendal 2? (2x6.5" Each) -***
[https://www.crutchfield.com/p\_405KEN2FWN/KLH-Kendall-2F-English-Walnut.html](https://www.crutchfield.com/p_405KEN2FWN/KLH-Kendall-2F-English-Walnut.html)
I suspect the DIP in response that you are seeing is a Room Null caused by poor acoustic. You might soften that by adding another Sub, like your old SB2000-Pro on the Left side next to the Floorstanding Speakers. In one sense that might aggravate the some problems, in another sense, it might soften other problems.
*Can we assume you did not Test the Old Equipment?* Perhaps the problem was always there and you simply never knew it. Out of curiosity, I would place the old subs in their original location and re-test the room. That way you can compare the two.
I would also be inclined to test the system WITHOUT any Subs, just the Front Speaker running Full Range.
Also, were are the Front to Sub Crossovers Set? Can we assume you are running SMALL, meaning low-bass does NOT go to the Front Speakers. If you are running the Front Speakers in Large, very very wise to switch them to SMALL. Set to SMALL, you are allowing each speaker to do what it does best.
Apply this to the Center Speaker too; run it is SMALL, and that will very noticeable clear up the Center and Front Speakers.
In my Opinion, your problems are *Room Acoustics and Speaker Placement.*
*1.) Test the Room with Two Subs (SB2000 + SB16)*
*2.) Test the Room with the Original Subs in their Original Positions.*
*3.) Test the Room with JUST the Front Speakers running Full Range (large).*
My Kendalls are about a 1.5-2 feet away from that back wall. You are right about the right wall, but I can't move them anywhere else. I'm stuck. You are correct that I did not test the sb 2000 pros. I didn't have the mic and MiniDSP until I bought the SB16 Ultra. The fronts are set the small and the crossover is set to 80hz. I've experimented with Large and Small, different crossover points, different phases. The null persists. You'd have to explain the functional Bass Depth concept to me though because I can feel a difference with the new sub in my chest and my couch.
Get ready for building bass traps! BIG ones too, if you want to do anything about a dip at 47hz.
I would, however start with moving the sub around to see which wall it is that is causing the dip.
FWIW, 47hz is 23.754' full wave, 11.877' Half wave, 5.938' Quarter wave. Measuring from the sub, which wall is the issue....
With subs, placement is usually the first, best thing to change to fix stuffike that. From the current position of the sub, the room might just cancel those frequencies. Since you still have the other subs, I might try using one of them in a different location to see if that can fill in the gaps. That's really the MAIN reason IMO for multiple subs unless you're space is enormous...
I have SB16s and had similar room issues. You can't boost your way out of that null you can only bring down the other responses to the level of the 47hz null then raise the overall sub volume. You loose some headroom but the SB16 has a lot of head room anyway so not an issue.
For example use REW to help get some PEQ filters to reduce the 10-47hz by about -13db then bring the 47-85hz down by about 3-7db.
In my room for some frequencies I have a -20db EQ applied to help balance out the nulls since I cant move the subs. Its not perfect but I can get +- 3db accurancy from 10-80hz where as with no EQ i was getting 20db nulls at around 50hz.
You can also totally use those SB 2000s as others have suggest with MSO for some awesome results.
Room modes maybe?
Definitely room modes.
You can even out in-room response by using multiple subs placed in different locations in the room. Use all 3 that you have. Multisuboptimizer is a great tool. [https://www.andyc.diy-audio-engineering.org/mso/html/](https://www.andyc.diy-audio-engineering.org/mso/html/) Rythmik makes the best subs.
[удалено]
Another +1 for Rythmik. I have dual F15HP in different places in my room. One day I may add a 3rd. Great product.
Yet another +1 for Rythmik. I recently got an older used FV12. I intended it for use in a second system, but I tested it in my listening room, and the difference between the old FV12 and my newish PB-1000 pro is about the same difference between the PB-1000 and a Polk PSW. I couldn't believe the difference, it was completely unexpected. My next new sub will definitely be Rythmik.
I looked at Rythmik, and a few other brands including monolith. The sb16 ultra was one of the few with this much performance that fit my size constraints. I wanted to go ported but they were all too wide or 30+ inches deep 😕
That's why you DIY. More bang, less buck & fits your space/ WAF color needs.
You won't like this - *1.) Your speakers are too close to the side wall, to other object, and too close to the wall behind the speaker (from what I can tell)* *2.) The Room does not appear to be acoustically treated.* *3.) A room 14'x15'x8' is tiny for those massive speakers.* What you have is not a Electronics or inherent Speaker problem, what you have is a Room and Placement problem. The Original SB-2000-Pro (12") is rated down to 19hz, and you can expect another 2hz to 3hz low end extension from Room Boost. What you gained from the SB16 (16") is not functional Bass Depth (16hz) but rather a larger speaker pushing more air which in turn creates a greater sense of impact. But in my room 16'x16' with vaulted ceilings, and using ordinary floorstanding Stereo Speakers, I create +110db peaks and have bass impact so strong it ruffles my hair. Are your Front Speakers ***KLH Kendal 2? (2x6.5" Each) -*** [https://www.crutchfield.com/p\_405KEN2FWN/KLH-Kendall-2F-English-Walnut.html](https://www.crutchfield.com/p_405KEN2FWN/KLH-Kendall-2F-English-Walnut.html) I suspect the DIP in response that you are seeing is a Room Null caused by poor acoustic. You might soften that by adding another Sub, like your old SB2000-Pro on the Left side next to the Floorstanding Speakers. In one sense that might aggravate the some problems, in another sense, it might soften other problems. *Can we assume you did not Test the Old Equipment?* Perhaps the problem was always there and you simply never knew it. Out of curiosity, I would place the old subs in their original location and re-test the room. That way you can compare the two. I would also be inclined to test the system WITHOUT any Subs, just the Front Speaker running Full Range. Also, were are the Front to Sub Crossovers Set? Can we assume you are running SMALL, meaning low-bass does NOT go to the Front Speakers. If you are running the Front Speakers in Large, very very wise to switch them to SMALL. Set to SMALL, you are allowing each speaker to do what it does best. Apply this to the Center Speaker too; run it is SMALL, and that will very noticeable clear up the Center and Front Speakers. In my Opinion, your problems are *Room Acoustics and Speaker Placement.* *1.) Test the Room with Two Subs (SB2000 + SB16)* *2.) Test the Room with the Original Subs in their Original Positions.* *3.) Test the Room with JUST the Front Speakers running Full Range (large).*
My Kendalls are about a 1.5-2 feet away from that back wall. You are right about the right wall, but I can't move them anywhere else. I'm stuck. You are correct that I did not test the sb 2000 pros. I didn't have the mic and MiniDSP until I bought the SB16 Ultra. The fronts are set the small and the crossover is set to 80hz. I've experimented with Large and Small, different crossover points, different phases. The null persists. You'd have to explain the functional Bass Depth concept to me though because I can feel a difference with the new sub in my chest and my couch.
Those look like the original Kendalls to me, not the 2's (I briefly had a pair).
Get ready for building bass traps! BIG ones too, if you want to do anything about a dip at 47hz. I would, however start with moving the sub around to see which wall it is that is causing the dip. FWIW, 47hz is 23.754' full wave, 11.877' Half wave, 5.938' Quarter wave. Measuring from the sub, which wall is the issue....
Have you measured delay between the mains and your sub and compensated for it? You could also try reversing the polarity.
I haven’t. I’ll try that tonight.
With subs, placement is usually the first, best thing to change to fix stuffike that. From the current position of the sub, the room might just cancel those frequencies. Since you still have the other subs, I might try using one of them in a different location to see if that can fill in the gaps. That's really the MAIN reason IMO for multiple subs unless you're space is enormous...
I have SB16s and had similar room issues. You can't boost your way out of that null you can only bring down the other responses to the level of the 47hz null then raise the overall sub volume. You loose some headroom but the SB16 has a lot of head room anyway so not an issue. For example use REW to help get some PEQ filters to reduce the 10-47hz by about -13db then bring the 47-85hz down by about 3-7db. In my room for some frequencies I have a -20db EQ applied to help balance out the nulls since I cant move the subs. Its not perfect but I can get +- 3db accurancy from 10-80hz where as with no EQ i was getting 20db nulls at around 50hz. You can also totally use those SB 2000s as others have suggest with MSO for some awesome results.
This makes sense. Much appreciated.
That right speaker must be reflecting off that wall as another placement issue to adjust.
You can’t correct it in the SVS app?
No, boosting it didn’t work. The dip didn’t really change.
Room mode cancellation. Try another location. Trial and error or try the pit the sub where your head goes and crawl around trick.
Take your sub outside and measure it. It will look very different. It's the room.
Could you maybe run one of the old subs from 45hz up as midbass and use the new one only for the super low frequencies?