Please help Monolith 10" sub no longer performing

[bomt697]

Main issue: getting poor performance from Monolith 10" sub

I recently moved my subwoofer and AVR (marantz 5013) to another room and my house and redid the same wiring configuration.
However, I am getting substantially less performance. Before, when this sub was my main HT sub, it sounded great.
But now its barely audible at the same settings (on sub and AVR) in a much smaller and enclosed room.
To get sort of noticeable performance I have to turn the sub to +6dB or more and have the AVR on +2-3dB.
Audyssey was also redone with no improvement.
Significantly needing boost the dB level compared how it was when I had the sub/AVR in another much larger room.

Currently I have the sub connected to the AVR via a mono RCA cable (Sub 1 out from AVR to Line in on the sub).
Crossover are matched on both at 90Hz.
Front speakers are set to small.
I've conducted a Sub Crawl, there is no place in the room that gives appropriately level of bass.
I used bass heavy music & movies, and pink noise to test the sub's performance.

I know the subwoofer works as I tried it with my music streamer, Bluesound Node.
Also, I know my AVR's sub out works bc I used a another sub (with same connection configuration), and there was huge jump in bass output (with a much less potent subwoofer, Jamo 10" 300watt). Setting needed to be toned to with Jamo sub
Different RCA and power cables were used to see if they were the issue, and they were not. Same poor performance.

Any ideas what could be causing the monolith 10" sub to perform so poorly? Please advise, thank you

 

[ryanosaur]

Well, the room is different. With low frequencies, the room has a much more profound effect on the performance.
What was the room size it was in, please include total open volume? Same for the new room.

 

[Pogre]

Different room acoustics. You might need to find a new spot in there for your sub. I've read too that rooms of equal lengths, like a perfect cube are pretty tough to get dialed in. If you can answer Ryan about room dimensions that would be a start.

 

[bomt697]

Well, the room is different. With low frequencies, the room has a much more profound effect on the performance.
What was the room size it was in, please include total open volume? Same for the new room.

The room the AVR and sub use to be was a semi closed room thats ~4000 cubic feet
And the room they are currently in are 1800 cubic feet

 

[bomt697]

Different room acoustics. You might need to find a new spot in there for your sub. I've read too that rooms of equal lengths, like a perfect cube are pretty tough to get dialed in. If you can answer Ryan about room dimensions that would be a start.

I placed the Jamo sub in the same spots i tried the monolith sub and the Jamo sounded great. So this makes me thinks the issue has less the to do with placement

 

[lovinthehd]

Maybe your sub automatically maxes out the low pass filter on the sub itself by using that input, but I'd max it out on the sub in any case; no reason to run the avr's filter and the sub's filter together....and wouldn't help your situation.

 

[lovinthehd]

The room the AVR and sub use to be was a semi closed room thats ~4000 cubic feet
And the room they are currently in are 1800 cubic feet

How about actual dimensions? Is the current room a sealed/closed room?

 

[bomt697]

How about actual dimensions? Is the current room a sealed/closed room?

15x10x12', closed room

 

[lovinthehd]

15x10x12', closed room

Was wondering if it was square/cube shape which might have pointed to more modal issues. Did you try moving the low pass filter on the sub to max value?

 

[bomt697]

Was wondering if it was square/cube shape which might have pointed to more modal issues. Did you try moving the low pass filter on the sub to max value?

I pushed it upto 140Hz with no improvement

 

[Micahd77]

YouTube guy had same problem something with thx and the receiver needing to be run on initial setup..it probably reset itself when you unplugged it for longer than normal