Must try MOD - Foam inside the stamped steel baskets - YES!
Comments
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The magnet and surrounding area is much larger than the outer basket with the 4 holes. Foam helps, but there is a lot or room for improvement left on the table.
I got my question answered regarding whether or not CSD would be a way to measure this and it turns out it just might be. Unfortunately CLIO isn't in my budget in the near future:
https://www.parts-express.com/Audiomatica-CLIO-Pocket-Version-2-Personal-Acoustic-Measurement-System-390-900?quantity=1
George / NJ
Polk 7B main speakers, std. mods+ (1979, orig owner)
Martin Logan Dynamo sub w/6ft 14awg Power Cord
Onkyo A-8017 integrated
Logitech Squeezebox Touch Streamer w/EDO applet
iFi nano iDSD DAC
iPurifier3
iDefender w/ iPower PS
Custom Steve Wilson 1m UPOCC Interconnect
iFi Mercury 0.5m OFHC continuous cast copper USB cable
Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
Custom Vibration Isolation Speaker Stands and Sub Platform -
While shopping for tires (daughter’s Corolla) I saw this thinking “I MUST post this for George et al:”Interesting…
One of the higher-end tire manufacturers, attempting to attenuate ~200hz road noise using a similar execution of foam on the interior
“… 9dB - that is how much our ContiSilent™ can reduce the sound of road noise inside your car. An inner tyre absorber, made of polyurethane foam, is attached to the inner surface of the tyre tread, to cushion the road.” Different material and frequency range target but answers Hansvelton’s question. As I said elsewhere: Foaming my LC*Rs’ mids significantly reduced their upper midrange “bark.”
*accomplished after original comment and Rob’s Plug mod
Buon Felice Natale and “Joyous listening!”
Samsung 60" UN60ES6100 LED, Outlaw Audio 976 Pre/Pro Samsung BDP, Amazon Firestick, Phillips CD Changer Canare 14 ga - LCR tweeters inside*; Ctr Ch outside BJC 10 ga: LCR mids “Foamed & Plugged**”, inside* & out
8 ga Powerline: LR woofers, inside* & out
*soldered **Rob the Man (Xschop) LR: Tri-amped RTi A7 w/Rotels. Woofers - 980BX; Tweets & Mids - 981, connected w/Monoprice Premiere ICs
Ctr Ch: Rotel RB981 -> Bi-amped CSi A6 Surrounds: Premiere ICs ->Rotel 981 -> AR 12 ga -> RTi A3. 5 Subs: Sunfire True SW Signature -> LFE & Ctr Ch; 4 Audio Pro Evidence @ the “Corners”. Power Conditioning & Distribution: 4 dedicated 20A feeds; APC H15; 5 Furman Miniport 20s -
George / NJ
Polk 7B main speakers, std. mods+ (1979, orig owner)
Martin Logan Dynamo sub w/6ft 14awg Power Cord
Onkyo A-8017 integrated
Logitech Squeezebox Touch Streamer w/EDO applet
iFi nano iDSD DAC
iPurifier3
iDefender w/ iPower PS
Custom Steve Wilson 1m UPOCC Interconnect
iFi Mercury 0.5m OFHC continuous cast copper USB cable
Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
Custom Vibration Isolation Speaker Stands and Sub Platform -
But seriously, pretty different application and much thicker so absorbs lower frequencies and vibrations like you get inside a tire, but cool just the same.
Reminds me a little of my Tannus Armor inserts on my mountain bike tires. Quieter but mainly for flat prevention. Used to get a couple every year and haven't had one in the last 10 years. It was always thorns believe it or not!
George / NJ
Polk 7B main speakers, std. mods+ (1979, orig owner)
Martin Logan Dynamo sub w/6ft 14awg Power Cord
Onkyo A-8017 integrated
Logitech Squeezebox Touch Streamer w/EDO applet
iFi nano iDSD DAC
iPurifier3
iDefender w/ iPower PS
Custom Steve Wilson 1m UPOCC Interconnect
iFi Mercury 0.5m OFHC continuous cast copper USB cable
Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
Custom Vibration Isolation Speaker Stands and Sub Platform
https://www.youtube.com/watch?v=WXzsVDl08A4