REW measured sub response in basement

[3dbinCanada]

Using the information in this link;

, I measured the in room response of my sub (only) by setting all my speakers to small and setting the crossover to 200Hz, the highest my AVR would allow me set them. Secondly, I limited the REW sweep from 15Hz to 200 Hz. The measurements I took are from the listener position (couch) starting at center, right, and left. The distance between center and right or left is 24" or 2 ft.



Based on this graph, do I need a 2nd sub to help me smooth out between 40Hz and 80Hz

 

[3dbinCanada]

Anyone?

 

[skid00]

I might suggest that you measure the sub close-up (6 inches from speaker cone). See what the speaker is capable of.

People buy multiple subs to get smooth bass at multiple locations in the room. It -is- possible to get flatter bass at your specific listening position by placing the sub in a more appropriate location. (That location may not be acceptable to your spouse, pets, or fire regs ) I am a strong believer in the 1/3 rule. Put the speaker 1/3 of the way away from each wall/floor surface. (You can't actually do that in practice, but close helps).

This spreadsheet will give you help in placing the sub(s):

https://www.harman.com/documents/Room%20Mode%20Calculator_0.xls

 

[3dbinCanada]

I might suggest that you measure the sub close-up (6 inches from speaker cone). See what the speaker is capable of.

People buy multiple subs to get smooth bass at multiple locations in the room. It -is- possible to get flatter bass at your specific listening position by placing the sub in a more appropriate location. (That location may not be acceptable to your spouse, pets, or fire regs ) I am a strong believer in the 1/3 rule. Put the speaker 1/3 of the way away from each wall/floor surface. (You can't actually do that in practice, but close helps).

This spreadsheet will give you help in placing the sub(s):

https://www.harman.com/documents/Room%20Mode%20Calculator_0.xls

I understand the multiple locations and using multiple subs but the youtube link I posted indicated a big change in bass response with a mere 16 inches to the left. My separation is 24 inches which is more than the youtube link. The only difference is that the seating position is covered by one couch instead of 2 separate chairs as in the link.

I will look at the room mode calculator. Thanks for posting.

 

[JStewart]

Based on this graph, do I need a 2nd sub to help me smooth out between 40Hz and 80Hz

If you’re looking for a good response and the same across the seats then both multiple subs and processing, such as MSO Multi-Sub Optimizer or Dirac Live Bass Contol.

There’s another school of thought to optimize for the MLP only, in which case a couple of subs and a MiniDSP HD can work wonders.

First and always, get the sub(s) and listening positions in the best responding places possible.

The middle response (red) looks like something you could improve on without a 2nd sub if you could apply some eq.

 

[3dbinCanada]

I've decided to tackle this again but in a different way. Room EQ was turned off, and the crossovers were set to 200Hz, the highest available setting on the AVR. Each graph has the 3 measurements across the width of the listener position (couch) but at a different location within the room.


I thinking I'm going with the new location as I get less variance across the seating position and another octave of response before it rolls off.

I have to play with Rythmik's settings next changing the roll-off of its filters and its EQ from extension to more midbass. I think I can get away with one sub based on what I'm seeing but I'm not sure.

 

[Richincanada]

There is not a single reason not to add a second sub if you have the means. In fact I went multiple 2 years ago and will never never go back. Add in the mini dsp and I'm in low end heaven

 

[JStewart]

No legends or titles on the charts to say what they are, but a couple look promising.

I think I can get away with one sub based on what I'm seeing but I'm not sure.

I think the only question remaining with a satisfactory response is will the sub play loud enough for your preferences, without compressing or distorting badly. You should be able to get some idea with REW on those if you had a mind to (and some ear plugs).

Which Rythmik sub?

 

[3dbinCanada]

No legends or titles on the charts to say what they are, but a couple look promising.



I think the only question remaining with a satisfactory response is will the sub play loud enough for your preferences, without compressing or distorting badly. You should be able to get some idea with REW on those if you had a mind to (and some ear plugs).

Which Rythmik sub?

I live in a townhouse or rowhouse so I have to be considerate of my neighbours. That single sub plays more than loud enough for that room size in the given listener position. Its a Rythmik LV-12R.

 

[Sonnie]

I'm a huge fan of multiple subs... nearly always several benefits.

Something else to consider is crossing over your T65's at 60Hz... they should be able to handle it well.

Dirac Live would help too.