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  • Install Advice

    Hey guys,

    I have been involved with home and car audio for years, but was recently asked by a friend to design and install a sound system in his commercial building and need some help with the design.

    The main room where the audio system will be installed is shown in the attacked picture. It's roughly a 75' by 45' rectangle (disregarding the loft area) and has a 20' drop ceiling. It is an indoor climbing and fitness center and will be playing 10 hours a day at moderate levels, but will also need to play at high levels for special events and parties that will be hosted frequently. The building is about 2 blocks away from a college campus and will be playing all types of music, but specifically a lot of bass heavy hip-hop/dance/techno. The budget is fairly tight at roughly $5000. but I think it should be enough to do what they need.

    So far I was thinking of using the following:

    Amp for mains: (2) Crown XLI 3500's
    Main Speakers: (4) DIY Sound Group Titan-615's shown in the attached picture
    Subwoofer Amp: (2) Benhringer Inuke 6000DSP
    Subs: (4) Eminence Definimax 4018LF, put in two separate cabinets wired in parallel for a 4 Ohm load each

    Note: I am an experienced carpenter and have built quite a few speakers for home theater and car audio, so construction is not a problem. Also, they will most likely use this set-up for a long time/until it dies, so resale value is not a big concern.

    My questions are:

    1) Will this speaker/subwoofer selection and quantity work well for my needs and the space? If not, what would you suggest?

    2) Where would you locate the speakers and subwoofers in the room for the most even response?

    3) What tuning frequency should be used for the subwoofer box given the music being played?
    -I modeled Eminence's recommended cab (40HZ) and it's response had a big hump on the lower frequencies. When I lowered
    the tuning to 32HZ however it flattened out the curve and gave me some added extension at the cost of some output. With 4
    drivers though I don't think output will be a huge issue.

    4) Is placing ports directly behind the woofer bad practice and will it change the tuning frequency? One cabinet design I was considering had the ports directly behind the woofers, but there was >1 Diameter's distance away from the woofer's magnet. Will this be an issue?

    Any help or suggestions are really appreciated. PM's are also welcome.

    Thanks.

  • #2
    1. My suggestion is going to be to ditch the subs altogether as I don't see the need for them given the main speaker choice and the fact that this isn't a night club environment. Getting good(even) coverage at sub frequencies is not a trivial thing to accomplish indoors.

    2. For most even coverage you want to consider a hung center cluster, that adds complexity and liability to this install but it will deliver the est results.

    3. If subs are used the 40hz tuning is fine.

    4. Ports should be on the face of the sub box not on the rear panel and all drivers should also be on the same baffle.. unless you are deliberately trying to build a cardiod design. That brings up another question, does this venue have neighbors that may object to even moderate low frequency "noise" bleeding into their environment?
    Paul O

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    • #3
      Trying to decide if subwoofers should be added or not is an issue is that I have wrestled with for a while, but ultimately I think they are needed. I spoke with the owners about it and in order to help their business stand out in a "college town" atmosphere, external subwoofers will be advantageous.

      Flying the cabinets overhead should not be a problem since there are a number of steel I beams running directly above the center of the room. The only questions I would have are how to position them altitude wise in reference to the drop ceiling and how much output would be lost from the cabs not being on the ground.

      It is a stand alone building with a fair amount of room around it, so they won't have any issue with sound leakage.

      Another big concern of mine is getting even high frequency coverage with only 4 speaker cabs and where to place them in the room. What would be the best way to accomplish that?

      Thanks for the reply.

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