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Old 05-02-12, 12:19 AM   #1
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On-Wall HT speakers


I have some Dayton RS180S-8 and RS28f-4 drivers that I want to use for some HT speakers. My room does not accommodate floor-standing speakers positioned away from walls. I built a test enclosure that I have tested. The drivers have very nice response when located more than two or three feet away from a wall. In this configuration, I could make a really nice 2.5 way design with very flat frequency response. When positioned against the wall, however, I get some pretty severe cancelation between 150Hz and 250Hz. The enclosure depth is six inches. I'm not sure I see a good way to prevent this behavior. I considered a 2.5 way design using the second woofer to reinforce the attenuated frequency range. I am concerned that this will not help much because the same cancellation mode will apply to both woofers. I could se some ideas from anyone who has Experience with this issue.


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Old 05-02-12, 10:12 PM   #2
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Best guess is that it is not a 1/4 wave cancellation from the front wall, unless the drivers are over 10" from the wall. Likely not enclosure resonance unless the enclosure has no bracing, but possibly room interaction? Is the dip in response in many locations?

JSS


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Old 05-02-12, 10:54 PM   #3
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Re: On-Wall HT speakers


Thanks for the response. The enclosure has internal bracing and is very solid. Other measurements suggest that my issue is with the placement and not the enclosure itself. I have attached some pictures. The first one is with the speaker on the floor in my measurement room. The second is in my living room where I removed the furniture and repeated measurements to see if the issue is a room mode associated with my measurement room. I suspected not because the issue remains with gating conditions that should remove reflections from the walls (not the floor because it is too close). The speaker is 6 inched deep and sets almost against the floor in the measurement room. I get exactly the same response nulls measuring in both rooms of significantly different dimensions. One picture shows the speaker on top of a stool and a bucket. While these items do influence the results, they do not change the behavior I was trying to confirm. The first measurement was collected with the speaker in the center of the room and shows pretty nice response (excluding the baffle step response). There are two pictures of this measurement with and without smoothing. The second measurement was collected with the speaker against the wall. This measurement is also shown with and without smoothing. Against the wall, I get some pretty substantial disturbance between about 150Hz and 400Hz. The response null gets more narrow and lower in frequency as I move the speaker away from the wall. My original intent was to use the on-wall configuration with little or no baffle step compensation. Now, I am not so sure, unless I can figure out how correct the low-frequency response. Any suggestions are greatly appreciated.

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Old 05-04-12, 01:58 PM   #4
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Re: On-Wall HT speakers


I thought this thread sounded familiar... it looks very familiar. Always good to ask a lot of quesitons!

HAve fun,
Frank, who uses the same alias on all forums


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Old 05-05-12, 06:37 AM   #5
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Mike
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Re: On-Wall HT speakers


I can only guess that these speakers will not sound of their best hard against a wall. Either put them in the room, or go back to the drawing board. Cheers, Mike.


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Old 05-08-12, 01:22 AM   #6
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Re: On-Wall HT speakers


wouldnt a crossover redesign give you a flatter response ??


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Old 05-08-12, 07:53 AM   #7
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Re: On-Wall HT speakers


The main differences I see from the floor to the wall measurement is all the fiberglass surrounding the speaker on the floor position, absorbing any reflection that could cause a null. It does look like a placement issue. Absorptive treatments only 2" thick should solve problems, and wall rigidity (or lack of) can cause some problems as well, when compared to a concrete floor.

JSS


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