Room acoustics and treatment options for 803D based system

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  • indiebands
    Junior Member
    • Mar 2009
    • 27

    #1

    Room acoustics and treatment options for 803D based system

    We plan to move to a new house soon. It is a rental, so we have to live with the space pretty much as is. It is obviously not an optimal “listening room” but I wanted to ask what kinds of room treatments I should consider (there will be a carpet in the listening triangle).

    My current setup is 803Ds as fronts with Vincent SP-995 monoblock amps driving them. For 2 channel music, I have the SA-93+ Preamp and CD-5 CD player (also both from Vincent). For HT, I have a Denon 2809 receiver connected via pre-out to the Vincent monoblocks & 803Ds and driving the (to be replaced) Polk center and surrounds. I plan to get an HTM2D center and a third Vincent SP-995 to have matching speakers and amplification across the front and to get a pair of SCMS’ for the surrounds for a 5 channel setup (the SCMS will continue to be driven by the Denon for now). I have never used a subwoofer, but may add one as well, though the 803Ds bass is pretty strong already. Here is a diagram of the planned speaker placement:



    Below is a diagram of the room with dimensions. The surfaces are as follows: floor – hardwood parquet laid on concrete, most walls & ceiling - plaster covered brick, long wall – drywall (I think) with 5cm of sound insulation between drywall and brick structural wall (shared with attached house next door).



    I would guess that the drywall + sound insulation wall will absorb some LF waves (according to the Crutchfield Room Acoustics guide), but that otherwise the plaster on brick walls/ceiling and wood floor on concrete will be mainly reflective. I used the axial room resonance mode formulas from Crutchfield to put together the following table.



    One obvious limitation is that the listening area is located at one end of a very long room, and by virtue of the window placement (can’t put widescreen TV in front of a window), the orientation of the front speakers is “across” the room rather than lengthwise. Another odd feature of the room is that the opening (no door) from the living room to the dining room is directly across from the wall where the fronts and center speakers will be (and almost directly behind the listening location). Because the room is relatively narrow (12.6 feet) and there has to be space to walk behind the couch, I will not have too much flexibility in the placement of the 803Ds – they are going to have to be relatively close to the wall behind them. In our current place, I have the 803Ds only 9 inches from the wall which I think is cramping their style a bit and making the bass a little more boomy than it should be. Here is the room resonance table for our current living room (19x21.5 feet with 11 foot ceilings), which might explain some of the boominess of the bass.



    In our new place, the surrounds will be wall mounted – one on the rear wall (from the listening perspective) in a little corner and nestled into a bookshelf and one mounted on the rear wall.

    I won’t be able to actually setup and listen to my system in the space until August, but I was wondering if the gurus in this forum could share their thoughts on any room treatments that I should definitely plan on (other than the obvious carpet between the couch and the speakers). Any other thoughts on speaker placement? How critical is the spacing from the wall behind the 803Ds (I’ll need to strike a balance between sound quality, space usability, and “bumping-into risk” with small kids around). Will the window or the opening in the “rear” wall have significant impact on the sound?

    Thanks in advance for any feedback or advice!
  • Briz vegas
    Super Senior Member
    • Mar 2005
    • 1199

    #2
    Not a guru by any stretch of the imagination but looking at your setup I would move it away from the front wall and tv for better 2 channel imaging, get that chair out from in front of the speaker and put something in that corner for the bass. Reflections from the front wall and the now close immediate back wall behind the couch should also help.

    I have a similar configuration but my system is across the middle of the room which eliminates the first reflections/interaction with the side walls.
    Mac 8gb SSD Audirvana ->Weiss INT202 firewire interface ->Naim DAC & XPS2 DR->Conrad Johnson CT5 & LP70S-> Vivid B1s. Nordost Valhalla cables & resonance management. (Still waiting for Paul Hynes PS:M)
    Siamese :evil: :twisted:

    Comment

    • jack d
      Senior Member
      • Sep 2006
      • 184

      #3
      Perhaps you should mount the TV on the wall so that you can get that cabinet out from between the 803s. IIUC you are going to have to get rid of that cabinet anyway when you get your center channel.

      Comment

      • indiebands
        Junior Member
        • Mar 2009
        • 27

        #4
        Originally posted by Briz vegas
        Not a guru by any stretch of the imagination but looking at your setup I would move it away from the front wall and tv for better 2 channel imaging, get that chair out from in front of the speaker and put something in that corner for the bass. Reflections from the front wall and the now close immediate back wall behind the couch should also help.

        I have a similar configuration but my system is across the middle of the room which eliminates the first reflections/interaction with the side walls.
        Thanks for the feedback. I am concerned with the speakers being so close to the front wall and will see what I can get away with given WAF and kids-running-around contstraints. The chair is an artifact of an earlier visualization and will not be in the way in the final setup. By "putting something in that corner for the bass," do you mean some kind of bass trap? or a sub?

        Comment

        • indiebands
          Junior Member
          • Mar 2009
          • 27

          #5
          Originally posted by jack d
          Perhaps you should mount the TV on the wall so that you can get that cabinet out from between the 803s. IIUC you are going to have to get rid of that cabinet anyway when you get your center channel.
          Hi Jack,
          Thanks. Yes, the TV is definitely going to be wall mounted. The amps and AV equipment will have to go somewhere, so I think it will be in a cabinet below the TV, with the HTM2D sitting on top of the rack/cabinet and right under the wall-hung TV. If I can move the 803Ds away from the wall a bit, they should be at least modestly in front of the equipment cabinet.

          Comment

          • indiebands
            Junior Member
            • Mar 2009
            • 27

            #6
            Originally posted by Briz vegas
            Not a guru by any stretch of the imagination but looking at your setup I would move it away from the front wall and tv for better 2 channel imaging, get that chair out from in front of the speaker and put something in that corner for the bass. Reflections from the front wall and the now close immediate back wall behind the couch should also help.

            I have a similar configuration but my system is across the middle of the room which eliminates the first reflections/interaction with the side walls.
            Hi Briz,

            Quick follow up question. Any suggestions for coffee table that will need to be in front of the sofa during non-hardcore listening sessions? I'd like to minimize accoustic disruption if possible. Thanks in advance for any thoughts.

            Comment

            • wettou
              Ultra Senior Member
              • May 2006
              • 3398

              #7
              Originally posted by indiebands
              Hi Briz, Quick follow up question. Any suggestions for coffee table that will need to be in front of the sofa during non-hardcore listening sessions? I'd like to minimize accoustic disruption if possible. Thanks in advance for any thoughts.
              Coffee tables are the worst thing to put between you and your speakers!

              Did you ever noticed that when going to a good HiFi dealer there is nothing between you and the speakers and most of the time your seat is no further than seven feet so you can avoid first reflections :T
              Farming looks mighty easy when your plow is a pencil, and you're a thousand miles from the corn field."Dwight D. Eisenhower

              Comment

              • indiebands
                Junior Member
                • Mar 2009
                • 27

                #8
                Originally posted by wettou
                Coffee tables are the worst thing to put between you and your speakers!

                Did you ever noticed that when going to a good HiFi dealer there is nothing between you and the speakers and most of the time your seat is no further than seven feet so you can avoid first reflections :T
                Thanks. Understand that coffee tables are evil. Unfortunately, it will be a necessary evil for us, so I guess the least worst solution would be something with wheels that can be easily moved out of the way when listening to music or watching movies. Or, maybe we could go for the old fashioned "TV tables" for eating dinner in front of the tube. . .

                Comment

                • Horacio
                  Senior Member
                  • Jan 2005
                  • 142

                  #9
                  Indiebands,

                  I just saw this post, even though it's been around for a while.

                  So is the sofa going to end up further back nearer to the wall with the back speakers? If so, and if you need to have a coffee table (I also do), maybe you can have a chair you move in and out for critical listening sessions. So you would have the sofa, the coffe table, and another chair for critical listening. Nothing would stand between you and the speakers, and you could adjust chair placement for optimal listening (unlike the sofa). I'm thinking an IKEA chair type, that is comfortable and light.

                  I'm a stereo guy and as such believe for HT you don't really need that much. Can you tell good accoustics from not-as-good during a movie?

                  As for kids running around (I also have that!), are you concerned they might push the speakers or they might bump into a driver? My kids, all quite young and physical, learned to live with the speakers in their way, and I added heavy wood bases with increased footprint to insure they don't accidentally make them fall (keep in mind I have 804S, which are easier to make fall down).

                  How about setting the speakers on the short wall? Doable?

                  Cheers,
                  Horacio

                  Comment

                  • indiebands
                    Junior Member
                    • Mar 2009
                    • 27

                    #10
                    Originally posted by Horacio
                    Indiebands,

                    I just saw this post, even though it's been around for a while.

                    So is the sofa going to end up further back nearer to the wall with the back speakers? If so, and if you need to have a coffee table (I also do), maybe you can have a chair you move in and out for critical listening sessions. So you would have the sofa, the coffe table, and another chair for critical listening. Nothing would stand between you and the speakers, and you could adjust chair placement for optimal listening (unlike the sofa). I'm thinking an IKEA chair type, that is comfortable and light.

                    I'm a stereo guy and as such believe for HT you don't really need that much. Can you tell good accoustics from not-as-good during a movie?

                    As for kids running around (I also have that!), are you concerned they might push the speakers or they might bump into a driver? My kids, all quite young and physical, learned to live with the speakers in their way, and I added heavy wood bases with increased footprint to insure they don't accidentally make them fall (keep in mind I have 804S, which are easier to make fall down).

                    How about setting the speakers on the short wall? Doable?

                    Cheers,
                    Horacio
                    Hi Horacio,
                    Thanks for your feedback. The chair for serious stereo is a good idea. I'll try to work that into the plan. As for the speakers on the short wall, the problem is the window that is in the middle of that wall makes it a difficult place for a TV to live on the wall. The couch will be facing the TV and the 803Ds with its back to the SCMS surrounds. The couch may be a little farther back than the ideal listening triangle would dictate, but with the movable stereo chair, that should not be an issue. As for HT, do I think acoustics do matter, though given the razzle dazzle of multichannel sound tracks, it is not as critical as with stereo.

                    As for the kids running around, my main concern is bumping into a driver/ the speaker. Our son at age 5 is pretty careful and aware of the speakers' presence since he is knows they are very fragile (he actually came with me for a listening session and had fun pointing out where the instruments were in the soundstage). The wood base idea raises another issue - spikes vs. rubber feet on the 803Ds. Since the house is a rental and has a hardwood floor, I can't use the spikes directly. My dealer has been pitching me on some special ceramic ball based speaker "feet" instead of spikes or the supplied rubber feet. If I did go with an extended footprint wood base then I could use the spikes on the base and have some felt under the wood base to facilitate repositioning of the speakers. Thinking about it, what I might do is plan for an easily detachable railing that I can use for a few years while kids are running around. Obviously it would be detached for any serious listening. I like your approach of increasing the footprint by using a base- can you post some pics? Thanks.

                    Cheers!

                    Comment

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