Hey all, I have recently run into issues with my DIY sub I built 12 years ago (details below). Just the last few months I had started to notice distortion/flutter/chuffing at around 35hz or so while whatching movies and playing test videos on youtube. I've noticed that the cone has seperated about 1/3 of the way around the cone. I've glued it back on hoping that it'll work the same. If not, it's a 12 year old Cerwin Vega that I can just replace.
My main concern is upon reading up abit more (something I don't think I researched properly years ago) is my sub box too big? At the time, I recall using probably WinISD. Of course being that long ago, I don't have any idea where or if I saved the design files. I have no idea what I 'tuned' it to or why I made it this large.
Outer measurements of box (made with 14mm mdf): W 490mm D 450mm H 820mm - Approx 180 litres (6.3 ft3)
Inner is filled with 3/4" poly-fluff batting.
Ports
Two Flared 200mm x 140mm (100mm to 90mm width end to end)
Speaker Specs: 12" Cerwin Vega
Diameter: 12”
No. of Voice Coils: 1
Sensitivity (1W at 1m): 94 dB
Power Handling: 400 Wrms
(cont. unclipped power per EIA RS-426B)
Frequency Response: 20 ~ 500 Hz
Nominal Impedance: 8ohms
Voice Coil Diameter: 3.0”
Mounting Diameter: 11” (279.4 mm)
Mounting Depth: 5.625” (142.9 mm)
Vega-128 Thiele-Small Parameters
Free-Air Resonance: fs 24 Hz
Total Q: Qts 0.362
Mechanical Q: Qms 3.89
Electrical Q: Qes 0.399
Compliance Volume: Vas 3.08 ft3
Maximum Excursion: Xmax 1.50" (+-0.75”)
38.0 mm (+-19.00 mm)
Voice Coil DC Resistance: Revc 6.4 ohm
Volume Displacement: .13 ft3
Amp: 250w Sub Amp (Cross over and 180 phase etc built in)
Thanks for your help/advice!
My main concern is upon reading up abit more (something I don't think I researched properly years ago) is my sub box too big? At the time, I recall using probably WinISD. Of course being that long ago, I don't have any idea where or if I saved the design files. I have no idea what I 'tuned' it to or why I made it this large.
Outer measurements of box (made with 14mm mdf): W 490mm D 450mm H 820mm - Approx 180 litres (6.3 ft3)
Inner is filled with 3/4" poly-fluff batting.
Ports
Two Flared 200mm x 140mm (100mm to 90mm width end to end)
Speaker Specs: 12" Cerwin Vega
Diameter: 12”
No. of Voice Coils: 1
Sensitivity (1W at 1m): 94 dB
Power Handling: 400 Wrms
(cont. unclipped power per EIA RS-426B)
Frequency Response: 20 ~ 500 Hz
Nominal Impedance: 8ohms
Voice Coil Diameter: 3.0”
Mounting Diameter: 11” (279.4 mm)
Mounting Depth: 5.625” (142.9 mm)
Vega-128 Thiele-Small Parameters
Free-Air Resonance: fs 24 Hz
Total Q: Qts 0.362
Mechanical Q: Qms 3.89
Electrical Q: Qes 0.399
Compliance Volume: Vas 3.08 ft3
Maximum Excursion: Xmax 1.50" (+-0.75”)
38.0 mm (+-19.00 mm)
Voice Coil DC Resistance: Revc 6.4 ohm
Volume Displacement: .13 ft3
Amp: 250w Sub Amp (Cross over and 180 phase etc built in)
Thanks for your help/advice!