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Bobcat Excavators
Soundproofing ideas?
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<blockquote data-quote="melli" data-source="post: 64102" data-attributes="member: 7164"><p>Got a little busy and installed the sound dampening stuff...still need to remove the ducting system for heater/ac, but I got the floor pan, cover over ac/heater unit, behind seat (high), metal strip on ceiling, glovebox (behind seat). Was going to remove the OEM foam/carpet on ceiling and cab supports, but they glued those suckers on, so I'll just leave them (1" med weight foam with carpet like cover). I also need to find some heavy foam/carpet for behind seat. I got a reading as low as 82db after warmup on first program, which is a 9db drop. The second program actually registered a 81db at startup, but then stuck on 86db for all other readings...something not right with that program. I flirted with high 70's while playing with throttle...trying to remove resonance. As far as seat of the pants impression, it made a noticeable difference. Of course, not as much as I was hoping, but if I get behind seat with foam and plug leaks where hyd lines go to left joystick, I might get into the 70's. The higher frequencies were muted more than the lower. Makes sense, given the stuff I put on is made for reducing higher freq. <a href="http://www.flickr.com/photos/90546471@N04/8547632786/" target="_blank"><img src="http://farm9.staticflickr.com/8523/8547632786_a73bd0deec_b.jpg" alt="2013-03-10 18.19.34" class="fr-fic fr-dii fr-draggable " style="" /></a> What I should have done is record the noise before and after, then use a freq analyzer to chart freq of both times...would see which freq I lost, and which I didn't. The db meters measure sound pressure, but not freq...it is those high freqs which get to me. After warmup I played around a bit regrading my parking area without earmuffs...been a long time since I've done that. One thing that was very noticeable, is before I would notice a big improvement by leaving door open, but now, there is no difference (tin can feeling is gone).</p></blockquote><p></p>
[QUOTE="melli, post: 64102, member: 7164"] Got a little busy and installed the sound dampening stuff...still need to remove the ducting system for heater/ac, but I got the floor pan, cover over ac/heater unit, behind seat (high), metal strip on ceiling, glovebox (behind seat). Was going to remove the OEM foam/carpet on ceiling and cab supports, but they glued those suckers on, so I'll just leave them (1" med weight foam with carpet like cover). I also need to find some heavy foam/carpet for behind seat. I got a reading as low as 82db after warmup on first program, which is a 9db drop. The second program actually registered a 81db at startup, but then stuck on 86db for all other readings...something not right with that program. I flirted with high 70's while playing with throttle...trying to remove resonance. As far as seat of the pants impression, it made a noticeable difference. Of course, not as much as I was hoping, but if I get behind seat with foam and plug leaks where hyd lines go to left joystick, I might get into the 70's. The higher frequencies were muted more than the lower. Makes sense, given the stuff I put on is made for reducing higher freq. [URL='http://www.flickr.com/photos/90546471@N04/8547632786/'][IMG alt="2013-03-10 18.19.34"]http://farm9.staticflickr.com/8523/8547632786_a73bd0deec_b.jpg[/IMG][/URL] What I should have done is record the noise before and after, then use a freq analyzer to chart freq of both times...would see which freq I lost, and which I didn't. The db meters measure sound pressure, but not freq...it is those high freqs which get to me. After warmup I played around a bit regrading my parking area without earmuffs...been a long time since I've done that. One thing that was very noticeable, is before I would notice a big improvement by leaving door open, but now, there is no difference (tin can feeling is gone). [/QUOTE]
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Soundproofing ideas?
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