Sound Quality (Vinyl) - Revision history

Axon: Moving Vinyl Guide category over to Vinyl

2006-09-08T17:11:15Z

Moving Vinyl Guide category over to Vinyl

← Older revision		Revision as of 17:11, 8 September 2006
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	[[Category:Guides]]		[[Category:Guides]]
	[[Category:Vinyl ~~Guide~~]]		[[Category:Vinyl]]

Axon: Evaluating Vinyl Sound Quality moved to Sound Quality (Vinyl): Making vinyl-related topics be a consistent format.

2006-09-08T16:59:54Z

Evaluating Vinyl Sound Quality moved to Sound Quality (Vinyl): Making vinyl-related topics be a consistent format.

← Older revision	Revision as of 16:59, 8 September 2006
(No difference)

Axon at 02:21, 8 September 2006

2006-09-08T02:21:02Z

← Older revision		Revision as of 02:21, 8 September 2006
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	~~''This article is in a series pertaining to vinyl setup. For the other articles, see the top-level [[Vinyl Guide]].''~~

	=Sources of Distortion=		=Sources of Distortion=
	==Turntable==		==Turntable==
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	==Stereo Separation==		==Stereo Separation==

			[[Category:Guides]]
			[[Category:Vinyl Guide]]

Axon: /* Low rumble */

2006-07-14T04:31:16Z

Low rumble

← Older revision		Revision as of 04:31, 14 July 2006
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	Rumble is an intrinsic part of both the vinyl medium and the turntable. It originates from several sources:		Rumble is an intrinsic part of both the vinyl medium and the turntable. It originates from several sources:

	- Low-frequency vibrations from the air and ground are coupled to the cartridge through the turntable and the record itself.		* Low-frequency vibrations from the air and ground are coupled to the cartridge through the turntable and the record itself.
	- Low-frequency signals on the record itself. Lateral signals exist due to off-center holes and groove compression at cutting time. Vertical signals exist due to record warping and cutting distortion.		* Low-frequency signals on the record itself. Lateral signals exist due to off-center holes and groove compression at cutting time. Vertical signals exist due to record warping and cutting distortion.
	- The resonant frequency of the cartridge-tonearm system, typically 5-15hz, stores and amplifies external energy.		* The resonant frequency of the cartridge-tonearm system, typically 5-15hz, stores and amplifies external energy.

	Often times, 5-10dB of the peak amplitude of a vinyl recording is contained in the rumble, and removing it can help increase the loudness for essentially free. Playback with significant rumble can be audible with subwoofers, or can increase distortion by driving speakers closer to excursion.		Often times, 5-10dB of the peak amplitude of a vinyl recording is contained in the rumble, and removing it can help increase the loudness for essentially free. Playback with significant rumble can be audible with subwoofers, or can increase distortion by driving speakers closer to excursion.

Axon: /* Low rumble */

2006-07-14T04:30:28Z

Low rumble

← Older revision		Revision as of 04:30, 14 July 2006
Line 39:		Line 39:
	Rumble is an intrinsic part of both the vinyl medium and the turntable. It originates from several sources:		Rumble is an intrinsic part of both the vinyl medium and the turntable. It originates from several sources:

	* Low-frequency vibrations from the air and ground are coupled to the cartridge through the turntable and the record itself.		- Low-frequency vibrations from the air and ground are coupled to the cartridge through the turntable and the record itself.
	* Low-frequency signals on the record itself. Lateral signals exist due to off-center holes and groove compression at cutting time. Vertical signals exist due to record warping and cutting distortion.		- Low-frequency signals on the record itself. Lateral signals exist due to off-center holes and groove compression at cutting time. Vertical signals exist due to record warping and cutting distortion.
	* The resonant frequency of the cartridge-tonearm system, typically 5-15hz, stores and amplifies external energy.		- The resonant frequency of the cartridge-tonearm system, typically 5-15hz, stores and amplifies external energy.

	Often times, 5-10dB of the peak amplitude of a vinyl recording is contained in the rumble, and removing it can help increase the loudness for essentially free. Playback with significant rumble can be audible with subwoofers, or can increase distortion by driving speakers closer to excursion.		Often times, 5-10dB of the peak amplitude of a vinyl recording is contained in the rumble, and removing it can help increase the loudness for essentially free. Playback with significant rumble can be audible with subwoofers, or can increase distortion by driving speakers closer to excursion.

Axon: /* Low rumble */

2006-07-14T04:29:58Z

Low rumble

← Older revision		Revision as of 04:29, 14 July 2006
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	''The low frequency noise (rumble) of the turntable must not impinge on program material, must not distort amplifier or speaker stages, and must not be audible.''		''The low frequency noise (rumble) of the turntable must not impinge on program material, must not distort amplifier or speaker stages, and must not be audible.''

	Rumble is an intrinsic part of both the vinyl medium and the turntable. Often times, 5-10dB of the peak amplitude of a vinyl recording is contained in the rumble, and removing it can help increase the loudness for essentially free.		Rumble is an intrinsic part of both the vinyl medium and the turntable. It originates from several sources:

			* Low-frequency vibrations from the air and ground are coupled to the cartridge through the turntable and the record itself.
			* Low-frequency signals on the record itself. Lateral signals exist due to off-center holes and groove compression at cutting time. Vertical signals exist due to record warping and cutting distortion.
			* The resonant frequency of the cartridge-tonearm system, typically 5-15hz, stores and amplifies external energy.

			Often times, 5-10dB of the peak amplitude of a vinyl recording is contained in the rumble, and removing it can help increase the loudness for essentially free. Playback with significant rumble can be audible with subwoofers, or can increase distortion by driving speakers closer to excursion.

	==Frequency response==		==Frequency response==

Axon: /* Pitch, wow and flutter */

2006-07-11T16:51:16Z

Pitch, wow and flutter

← Older revision		Revision as of 16:51, 11 July 2006
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	Shockingly, this is extremely hard to achieve in belt-drive turntables for a number of very important reasons. Good direct drives are much better at pitch. (Bad direct drives are much worse at flutter.)		Shockingly, this is extremely hard to achieve in belt-drive turntables for a number of very important reasons. Good direct drives are much better at pitch. (Bad direct drives are much worse at flutter.)

			Under certain pathological circumstances, playback tolerances much lower than 0.3% may be audible. For instance, if playing in a very large room with echo on the rear wall, the reflected music will interfere with the speaker output. Beat frequencies could thus develop at potentially [i]any[/i] playback tolerance.

			Note that the standard tolerance for center holes (<0.2mm off center) results in a very large wow at inner grooves. (For a 0.2mm deviation, at a groove radius of 60mm the wow will be 0.6% p-p).

	==Low rumble==		==Low rumble==

Axon at 22:12, 25 April 2006

2006-04-25T22:12:45Z

← Older revision		Revision as of 22:12, 25 April 2006
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			''This article is in a series pertaining to vinyl setup. For the other articles, see the top-level [[Vinyl Guide]].''

	=Sources of Distortion=		=Sources of Distortion=
	==Turntable==		==Turntable==

Axon at 22:10, 25 April 2006

2006-04-25T22:10:00Z

New page

=Sources of Distortion=
==Turntable==
===Turntable Level===
===Environmental Noise===
===Motor Noise===
===Belt/Drivetrain Wear===
===Record Wear===
==Tonearm, Cartridge and Stylus==
===Tracking Error===
===Cartridge Alignment===
===Tonearm Alignment===
===Cartridge Damage===
===Stylus Wear===
===Stylus Damage===
===Cartridge Distortion===
===Electromagnetic Interference===
===Mechanical Resonance===
==Preamp==
===Preamp Distortion===
===Cartridge Loading===

=Objective Requirements Of Vinyl Playback=
These statements are derived from psychoacoustics and electrical constraints that would be necessary to yield objectively optimal playback. These statements also form a concise summary of the audible issues with vinyl.

==Pitch, wow and flutter==
''The playback speed of the turntable must be within 0.3% of 33 1/3 RPM at all times - or 5 cents. Variations of pitch must stay witin the 5-cent requirement and the modulating frequencies must not be audible.''

Shockingly, this is extremely hard to achieve in belt-drive turntables for a number of very important reasons. Good direct drives are much better at pitch. (Bad direct drives are much worse at flutter.)

==Low rumble==
''The low frequency noise (rumble) of the turntable must not impinge on program material, must not distort amplifier or speaker stages, and must not be audible.''

Rumble is an intrinsic part of both the vinyl medium and the turntable. Often times, 5-10dB of the peak amplitude of a vinyl recording is contained in the rumble, and removing it can help increase the loudness for essentially free.

==Frequency response==
''After RIAA equalization, the system must be able to reproduce frequencies from 20hz to 20khz to within 0.1dB of the source media.''

0.1dB is close to the theoretical JND of amplitude for a single sinusoid; tolerances around 1dB in response are usually acceptable.

MM cartridges are well-known for boosting the high end if improperly loaded. Stylus or record wear will eliminate high frequencies. Rumble may make low frequency reproduction difficult.

==Stereo Separation==