Dankimus Posted July 9, 2015 Share Posted July 9, 2015 Ok so I just hooked up my dads old record player, listening to Pink Floyd's "The Wall" right now, and the sound is amazing, but my speakers are surging in and out crazily when I turn it up. They don't normally do it at loud volume and it doesn't even correspond with the music. WTF is going on? 1 Quote Link to comment Share on other sites More sharing options...
Dankimus Posted July 9, 2015 Author Share Posted July 9, 2015 i tried a few different albums, all with the same result. While the speakers surging in and out isn't audible on it's own, it is having an effect on the music while it is playing. I am out of my realm here, any help would be appreciated. Quote Link to comment Share on other sites More sharing options...
garyrc Posted July 9, 2015 Share Posted July 9, 2015 (edited) Ok so I just hooked up my dads old record player, listening to Pink Floyd's "The Wall" right now, and the sound is amazing, but my speakers are surging in and out crazily when I turn it up. They don't normally do it at loud volume and it doesn't even correspond with the music. WTF is going on? Your dad's old record player probably has turntable rumble. It is very common in old turntables that have not been reconditioned. It never occurs with our modern digital discs and disc players (CD, SACD, DVD, Blu-ray, etc.), so I can see why it surprised you. It causes speaker cones (woofer cones) to pump in and out violently, but only a little -- or none -- of the pumping is audible, because it is too deep in the bass. If the turntable has direct drive, the rubber driver (if any) might be replacable. If it has belt drive, then any rumble probably comes from the bearings, or elsewhere. The rumble will affect the audible spectrum because of Doppler distortion, and at high volume, it is not particularly good for woofers. Does any one on the forum do turntable repair? Rumble filters used to be available, and may be now. Some were stand-alone boxes. You would probably have to put such a filter in your processor loop, if your receiver or pre-amp has one. A few preamps had built-in rumble filters. What is the make and model of the record player? Edited July 9, 2015 by garyrc 2 Quote Link to comment Share on other sites More sharing options...
djk Posted July 9, 2015 Share Posted July 9, 2015 It is not a turntable issue, nor is it rumble. It is pinch (8hz) and saddle warp (0.5hz). You need a filter to remove it. 1 Quote Link to comment Share on other sites More sharing options...
ricktate Posted July 9, 2015 Share Posted July 9, 2015 Yea what djk said it is probably a warped record or tracking force set wrong. Older receivers had a low end filter I do not know if newer avrs have one ....have not been rich enough to get one of those. lol Rick Quote Link to comment Share on other sites More sharing options...
JJkizak Posted July 9, 2015 Share Posted July 9, 2015 Why didn't they tell me that about 50 years ago? JJK Quote Link to comment Share on other sites More sharing options...
Don Richard Posted July 9, 2015 Share Posted July 9, 2015 Back during the "Golden Age of Stereo" people were actually proud of their woofers pumping. Speaker grills were removed so that all could witness the woofer cones jumping in and out. I once saw a salesman actually using that as a selling point. I walked over and said, "Do you know that can damage the woofers?", then pushed the low cut filter. The motion stopped, and I walked away chuckling. 4 Quote Link to comment Share on other sites More sharing options...
Dankimus Posted July 9, 2015 Author Share Posted July 9, 2015 Thanks for the feedback. The turntable is a Technics sl-1900, which is a direct-ddrive unit, that my dad was really proud of when I was a kid. He spent a bit upgrading the stylus to make it better. It had been sitting on a shelf in the garage for the past 25-30 years. This model of Marantz didn't have a phono input, which is why I had to buy a pre-amp. Haven't seen any low-pass filter settings for the inputs in the menus. I will play with it some more when I get home from work. Quote Link to comment Share on other sites More sharing options...
Stevenarrow Posted July 9, 2015 Share Posted July 9, 2015 does it happen when the stylus is not touching the record? does it happen when the record is spinning, and what about not spinning? Quote Link to comment Share on other sites More sharing options...
Dankimus Posted July 9, 2015 Author Share Posted July 9, 2015 it sits and spins without the stylus touching without issue. once the stylus touches the woofers will start pulsing. I've been reading around through other forums and apparently this is a very common issue. looking into finding a decent rumble filter to cure my woes. A disc washer is on the list of must haves as well. 1 Quote Link to comment Share on other sites More sharing options...
cradeldorf Posted July 9, 2015 Share Posted July 9, 2015 (edited) That's why most old amps had a low cut filter and a phono preamp. Edited July 9, 2015 by cradeldorf 1 Quote Link to comment Share on other sites More sharing options...
Stevenarrow Posted July 9, 2015 Share Posted July 9, 2015 it sits and spins without the stylus touching without issue. once the stylus touches the woofers will start pulsing. I've been reading around through other forums and apparently this is a very common issue. looking into finding a decent rumble filter to cure my woes. A disc washer is on the list of must haves as well. If this is a road you want to go down (vinyl playback), I would start with a decent and modern entry level turntable. You will save yourself money and headache in the long run. I've been venial only place back for the past 15 years now. It's rewarding and frustrating. Quote Link to comment Share on other sites More sharing options...
babadono Posted July 9, 2015 Share Posted July 9, 2015 just curious.. the SL 1900 is a bad turntable? Or maybe it needs some TLC Quote Link to comment Share on other sites More sharing options...
Dankimus Posted July 9, 2015 Author Share Posted July 9, 2015 the sl 1900 is a decent turntable. I just ordered a djpre II preamp with built in line cut filter to cut out the stuff below 20hz. people have had good results with it. Quote Link to comment Share on other sites More sharing options...
Marvel Posted July 9, 2015 Share Posted July 9, 2015 That should help a lot... Bruce Quote Link to comment Share on other sites More sharing options...
djk Posted July 10, 2015 Share Posted July 10, 2015 (edited) A 30hz/12dB or 20hz/18dB works well. I used to build a passive 12dB/30hz Q=1 filter for use in the tape loop. Stopped woofer failures, made the midrange cleaner, played louder. Edited July 11, 2015 by djk 1 Quote Link to comment Share on other sites More sharing options...
Shakeydeal Posted July 10, 2015 Share Posted July 10, 2015 The issue could be as djk described. However, I ask you what you are sitting the turntable on? I also ask if you are on the second story with sprung floors? This could cause what you describe. Isolation is very important with such low level signals. Shakey Quote Link to comment Share on other sites More sharing options...
ACM Posted July 10, 2015 Share Posted July 10, 2015 I'm not an expert by any stretch but wonder if a similiar result would be produced by a less than ideal cartridge/tonearm matchup? Quote Link to comment Share on other sites More sharing options...
colterphoto1 Posted July 10, 2015 Share Posted July 10, 2015 very inexpensive rumble dampening device can be made by floating a table of dense material (a slab of granite - like a sink cutout gotten from a countertop manufacturing shop) on 4 hand/tennis balls. Some slit the balls in two, or you can sit them in furniture caster cups. This will help isolate the turntable from acoustic low frequencies. Some here house their turntables on wall mounted shelves which helps isolate the table from footfalls or floor vibrations. I always prefer an acoustic solution to an electronic one. Again, this is just one of many possible solutions to what may be myriad issues. 1 Quote Link to comment Share on other sites More sharing options...
Dankimus Posted July 10, 2015 Author Share Posted July 10, 2015 The turntable was sitting on a small table between the right tower and the stereo shelf, not ideal by any means. I'm going to build a platform to dampen any vibrations as you described colterphoto1. hopefully that cleans it up. If not, the new preamp is arriving today. The low-cut filter in it is rated at -3dB @ 22Hz according to their website. I also just received a Furman PL-8C power conditioner that I am going to be installing. Quote Link to comment Share on other sites More sharing options...
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