speaker excursion on run in tracks

bullpeters · 16th July 2012, 08:13 AM

I am using a pretty quiet Phono preamp (almost inaudible back ground noise with ear an inch from driver)
Technics 1200, pretty well set up
Playing new vinyl.
On the lead in tracks and on the "in between" tracks the cone moves dramatically!

No real sound but obviously a fair pulse of signal.
Why? And what can I do about it?

pinkmouse · 16th July 2012, 08:18 AM

AFAIK, the appropriate standards define a high pass filter to remove this sort of LF noise. However because this involves big capacitors in the signal line, audiophile "fashion" has been to remove this feature. You can either build a new phono pre with HP built in, or possibly modify yours with a few extra components, but we need to see a schematic to be sure.

DF96 · 16th July 2012, 09:19 AM

It used to be called a rumble filter, but of course no self-respecting audiophile will admit to having a turntable which rumbles! The simplest thing (defined by RIAA as an option on the curve?) is a 20Hz first order high pass filter. Nowadays people seem to want to hear sound which was probably never there on the LP anyway, but as a consequence they are forced to 'hear' things which are not meant to be there.

16th July 2012, 08:13 AM	#1
bullpeters diyAudio Member Join Date: Apr 2009 Location: Right next to beach, a potatoe toss to the whitewater	speaker excursion on run in tracks I am using a pretty quiet Phono preamp (almost inaudible back ground noise with ear an inch from driver) Technics 1200, pretty well set up Playing new vinyl. On the lead in tracks and on the "in between" tracks the cone moves dramatically! No real sound but obviously a fair pulse of signal. Why? And what can I do about it?

16th July 2012, 08:18 AM	#2
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	AFAIK, the appropriate standards define a high pass filter to remove this sort of LF noise. However because this involves big capacitors in the signal line, audiophile "fashion" has been to remove this feature. You can either build a new phono pre with HP built in, or possibly modify yours with a few extra components, but we need to see a schematic to be sure. __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
need a few speaker test tracks for bass and sparkle	sprinter	Multi-Way	5	8th April 2011 01:19 PM
NEW GUY! So run, run as fast as you can and as far away as possible!	Formula350	Introductions	9	13th November 2010 08:59 PM
Multitrack Audio Tracks	mrhotmark	Everything Else	1	3rd January 2010 01:18 AM
Best test tracks for imaging	davidlzimmer	Music	34	18th December 2006 04:50 PM
Old tracks came alive!	davidlzimmer	Chip Amps	1	18th February 2006 09:08 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

16th July 2012, 09:19 AM	#3
DF96 diyAudio Member Join Date: May 2007	It used to be called a rumble filter, but of course no self-respecting audiophile will admit to having a turntable which rumbles! The simplest thing (defined by RIAA as an option on the curve?) is a 20Hz first order high pass filter. Nowadays people seem to want to hear sound which was probably never there on the LP anyway, but as a consequence they are forced to 'hear' things which are not meant to be there.