DIY Infinite Baffle Subwoofer Array
Dec 5, 2023 1:02:32 GMT -5
hjstack, cwmcobra, and 2 more like this
Post by hulkss on Dec 5, 2023 1:02:32 GMT -5
A forum member asked me to post some info on my homemade subwoofer array. I had posted some response measurements in another thread.
Below (bottom) is a REW frequency sweep measurement in my home theater seats using a high quality calibrated measurement mic and preamplifier. The crossover to my main speakers was set at 100 Hz for this measurement.
I have four dual opposing Infinite Baffle (IB) cabinets arranged along the front wall of my home theater (the black cubes in the photo below). The house has a crawl space under it. The back volume of the cabinets is open to the crawl space. This was a very easy build of four small cabinets (photos below). The dual opposing configuration cancels the acceleration force reactions of the heavy speaker cones to prevent vibration. The cabinets do not pressurize when the cones move as the total crawl space is open to them.
The drivers are exposed to humidity from the crawl space so I used eight model V154DV2 automotive subwoofers from Cerwin Vega. They have excellent high durability Santoprene Surrounds and Parabolic One Piece Stamped Carbon Fiber Poly Cones. They appear well constructed to take a lot of abuse. You can buy them from Cerwin Vega directly. Their specs are perfect for IB applications. A 1000 watt amp on each cabinet is enough to get your attention. The floor tile in the photos are 18 inches square.
Nominal Subwoofer Size 15”
Nominal Impedance (ohms) 4Ω
SPL (db) 86.7
Re (Ω)[series] 4.0 / 4.0
Qms 9.5
Qes 0.74
Qts 0.69
Fs-Free Air Resonance (Hz) 22.1
Vas (Liter) 166.8
Sd (cm²) 0.08
BL (T*M) 18.5
Xmax - Inch(mm) 18.1
Cms (mm/N) 0.32
Mms (g) 255.2
Pwr (W) NOM/MAX 550/1500
Total Diameter 15.78” (401mm)
Mounting Diameter (inch/mm) 13.62”(346mm)
Screw Hole Diameter 0.82” (21mm)
Mounting Depth 7.28”(185mm)
Magnet Diameter (E) 7.08" (180mm)
Displacement (ft3/L) (0.15ft3 / 4.18L)
Below (bottom) is a REW frequency sweep measurement in my home theater seats using a high quality calibrated measurement mic and preamplifier. The crossover to my main speakers was set at 100 Hz for this measurement.
I have four dual opposing Infinite Baffle (IB) cabinets arranged along the front wall of my home theater (the black cubes in the photo below). The house has a crawl space under it. The back volume of the cabinets is open to the crawl space. This was a very easy build of four small cabinets (photos below). The dual opposing configuration cancels the acceleration force reactions of the heavy speaker cones to prevent vibration. The cabinets do not pressurize when the cones move as the total crawl space is open to them.
The drivers are exposed to humidity from the crawl space so I used eight model V154DV2 automotive subwoofers from Cerwin Vega. They have excellent high durability Santoprene Surrounds and Parabolic One Piece Stamped Carbon Fiber Poly Cones. They appear well constructed to take a lot of abuse. You can buy them from Cerwin Vega directly. Their specs are perfect for IB applications. A 1000 watt amp on each cabinet is enough to get your attention. The floor tile in the photos are 18 inches square.
Nominal Subwoofer Size 15”
Nominal Impedance (ohms) 4Ω
SPL (db) 86.7
Re (Ω)[series] 4.0 / 4.0
Qms 9.5
Qes 0.74
Qts 0.69
Fs-Free Air Resonance (Hz) 22.1
Vas (Liter) 166.8
Sd (cm²) 0.08
BL (T*M) 18.5
Xmax - Inch(mm) 18.1
Cms (mm/N) 0.32
Mms (g) 255.2
Pwr (W) NOM/MAX 550/1500
Total Diameter 15.78” (401mm)
Mounting Diameter (inch/mm) 13.62”(346mm)
Screw Hole Diameter 0.82” (21mm)
Mounting Depth 7.28”(185mm)
Magnet Diameter (E) 7.08" (180mm)
Displacement (ft3/L) (0.15ft3 / 4.18L)
