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Topic: Damping factor

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Damping factor

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	[No title]
		Beyond that, damping factor is one of those numbers that has taken on undeserved and mythical proportions as an indicator of the quality of an amplifier.
		In fact, it can be shown that huge variations in damping factors themselves have absolutely miniscule effects on the control of the loudspeaker, effects which are FAR smaller than manufacturing variations in the components in the loudspeaker, variations in response due to atmospheric changes and so forth.
		Damping factor used to be of significance during the times of tube amplifier technology, wherein the output was usually taken from the anodes with relatively high impedance, through a matching transformer.
	ai.kaist.ac.kr /~suh/DIY/damping (2252 words)

	amplifier specs (Site not responding. Last check: 2007-11-06)
		The damping factor is the ratio between the load impedance and the amplifier's internal impedance (load impedance divided by internal impedance).
		The damping factor is most often used as an indication of the ability of an amplifier to control the motion of a driver.
		The damping factor is not as relevant when the amplifier is used to power mid-bass and tweeter drivers since those drivers already have pretty good transient response due to their relatively small cone size.
	www.wickedcases.com /caraudio/ampspecs.html (3756 words)

	The damping factor (Site not responding. Last check: 2007-11-06)
		The damping factor is a little known parameter of an amplifier in this country.
		he Damping factor is a property of an audio power amplifier, and is a measure of its electrical performance.
		The Damping Factor is a measure of an amplifiers internal impedance.
	www.studio-systems.com /audiofeatures/novdec99/dampingFactor/damp01.htm (325 words)

	Legendary Audio Classics: Damping Factor
		Damping Factor is a term audio enthusiasts (and their rabid cousins, the audiophiles) run into time and time again.
		When one amplifier's damping factor is higher than another's, that tells you that the amplifier with the higher damping factor can better control the speaker systems, and all other things being equal (frequency response, phase shift, distortion, etc.) that it is a better amplifier.
		Damping factors can be quite high; for instance, an amplifier with an output impedance of.01 ohms would result in a damping factor of 800 against an 8 ohm load impedance, a very large number as compared to what we usually see power amplifiers rated.
	www.classic-audio.com /marantz/mdampingfactor.html (2430 words)

	Understanding Damping
		Damping factor is a measure of damping performance, much like a batting average or a grade point average.
		Damping is vastly improved relative to the raw drywall.
		Extensional damping is not effective on stiff structures, and as a result is almost solely found in applications where thin sheet metal is to be damped.
	www.greengluecompany.com /understandingDamping.php (622 words)

	live_audioStudyHall-Damping Factor
		The main effect of damping in a loudspeaker is to reduce the SPL produced by the loudspeaker's diaphragm moving because of its own inertia after the signal stops.
		Electrical damping is determined by the resistance load on the loudspeaker, which is the sum of the loudspeaker cable resistance, and the amplifier output impedance.
		Electrical damping or Damping Factor (DF) is calculated by dividing the loudspeaker's voice coil resistance by the sum of the loudspeaker cable resistance and amplifier output impedance.
	www.prosoundweb.com /studyhall/lastudyhall/df.html (607 words)

	Milbert Amplifiers, Damping Factor
		This being the case, common sense leads us to believe what the proponents of high damping factors say in their sales literature, namely, that the damping factor is a numerical indication of coupling between amplifier and loudspeaker and the higher the figure, the better off we are.
		Table 1 shows the specified damping factor of an amplifier against the actual over-all damping factors for a wide range of generator impedance values when the amplifier is connected to an 8-ohm speaker.
		But trying to prove that a damping factor of 200 or even more is somehow better than one of 20 is pretty unconvincing because the effective difference in the practical case cited is only that between 1.25 and 1.32.
	www.milbert.com /articles/DampingFactor.bdc (1530 words)

	output resistance and damping factor
		A privileged position assumes thereby the damping factor, it into relation to loudspeaker impedance (4 ohms or 8 ohms) is set, the unit shortens itself ohms.
		The damping factor is not a constant size, as it is often written.
		Effects on bad damping factor are, the output signal correspond less to the input signal.
	www.amplifier.cd /Tutorial/Innenwiderstand/output_resistance.htm (1547 words)

	Effect on Loudspeakers of Amplifier Damping Factor
		The damping factor of an audio amplifier is unrelated to the slew rate of the amplifier.
		An audio power amplifier's damping factor is defined as the ratio of the load impedance to the output impedance of the amplifier.
		Those sky high damping factors seen on the spec sheets of some amps are frequently just inventions of the marketing department and are irrelevant to actual system performance.
	www.trueaudio.com /post_013.htm (838 words)

	Audioholics, Audio Product Reviews for the Masses
		Many manufacturers trumpet their high damping factors (some claim figures in the hundreds or thousands) as a figure of some importance, hinting strongly that those amplifiers with lower damping factors are decidedly inferior as a result.
		We'll set out to do an analysis of what effect damping factor has on what most proponents claim is the most significant property: controlling the motion of the speaker where it is at its highest, resonance.
		The subject of damping factor and its effects on loudspeaker response is not some fl art or magic science, or even excessively complex as to prevent its grasp by anyone with a reasonable grasp of high-school level math.
	www.audioholics.com /techtips/audioprinciples/amplifiers/DampingFactor.html (1922 words)

	Articles
		Damping factor is related to amplifier output impedance, and can be explained as the ability of the amplifier to control the movement of a loudspeakers’ voice coil.
		For a given speaker load, the damping factor is, in practice, given mostly by the cable impedance, so that one should not place too much importance on this amplifier parameter.
		It is also important to note that damping is directly related to the speaker load, so that using an 8 ohm load will yield twice the damping factor compared to a 4 ohm load.
	www.prosound-systems.com /june2004/Articles/FAQ/FAQ48.htm (840 words)

	Enidine Incorporated Frequently Asked Questions Wire RopeIsolators (Site not responding. Last check: 2007-11-06)
		There are many common types of damping; viscous damping (orifice in a hydraulic shock absorber), hysteretic damping (occurs in an elastomeric isolator), and coulomb damping (as in a wire rope isolator).
		Critical damping is the smallest amount of damping required to return a system to its equilibrium position without oscillation.
		The system is said to have coulomb or dry friction damping if the damping force in a vibratory system is constant and independent of position or velocity of the system.
	www.enidine.com /WireFAQmain.html (1033 words)

	Missing Link in Speaker Operation
		The damping factor is equal to the nominal impedance divided by the internal resistance of the amplifier.
		The damping control should be calibrated directly in damping factor or internal resistance to simplify adjustment to a given speaker.
		To obtain the high damping factor of 10, negative voltage feedback is used around the loop until that value is obtained, say 18 db.
	www.paulspeltz.com /tomcik/index.html (4011 words)

	Calculation the damping of bridging an interface connecting circuit dampening matching pad DF damping factor - ... (Site not responding. Last check: 2007-11-06)
		Calculation the damping of bridging an interface connecting circuit dampening matching pad DF damping factor - sengpielaudio
		DF damping factor volt volts circuit connecting in out input output damping bridging resistance voltage divider level damping factor matching dB decibel
		That means level damping compared to the open circuit case.
	www.sengpielaudio.com /calculator-bridging.htm (177 words)

	diyAudio Forums Archive - Damping Factor >1000
		Damping factor is simply the ratio of the nominal load impedance divided by the amplifier's output impedance.
		Anyway, the difference in response between a damping factor of 100 and a damping factor of 1000 is negligible, unless there are very deep troughs in the impedance curve of the loudspeaker.
		Damping factor is measured at the _amplifier output clamps_ Zload/Zout.
	www.diyaudio.com /forums/showthread/t-22107.html (10897 words)

	Study on Damping Reduction Factor for Buildings under Earthquake Ground Motions (Site not responding. Last check: 2007-11-06)
		The issue will first be pointed out that the damping reduction factors adopted by those provisions are derived from the effects of viscous damping on displacement responses, but are used to reduce the design force of buildings.
		Results of this study suggest that if the damping of structures comes from the hysteretic response of the building, the design force of the structures should be the inertial force and the damping reduction factors should be derived from the acceleration responses.
		Otherwise, if the additional damping of structures comes from the added energy dissipation devices, the design force should be the restoring force and the damping reduction factors should be derived from the displacement responses.
	www.pubs.asce.org /WWWdisplay.cgi?0300512 (280 words)

	Sympathetic Vibratory Physics - John W. Keely's Sacred Science.
		In a system with poor damping, the speaker cone will continue to vibrate for a moment after the input signal has ended.
		A high amplifier damping factor, usually above 10, is satisfactory for most speaker systems, although some speakers operate best with amplifiers that have lower or higher damping factors.
		Clarity in the reproduction of complex orchestral passages - particularly those involving heavy percussion - is an indication of good damping characteristics, since good damping contributes to a speaker's transient response.
	www.svpvril.com /svpnotes/DAMPING_7509.html (128 words)

	Car Audio Message Forum - CarStereo.com
		damping factor changes depending on the impedance you run the amp at, and with a mono amp - generally running 1 or 2 ohm loads it's always going to be low.
		I know that a lot of people think that damping does not matter but the fact is that dp is the difference between an awesome sub amp and a muddy amp.
		PS: I have looked into the dp factor of most car amps and they are not very high, usually less that 300, which is terrible by my standards because at 8ohm a dp factor of 1000 is recommended for a sub speaker.
	www.carstereo.com /forum/showthread.cfm?tid=8839 (637 words)

	Products & Technology - Understanding Amplifier Power Rating (Pg 2 of 2)
		If it's.08, then the amplifier provides a damping factor of 100, etc. Don't confuse the actual output (source) impedance with the load impedance that is recommended for the amp (4-Ohms, 8-Ohms, etc).
		In reality, the true damping that the cone "sees" is determined by many things, part of which is the damping limitation imposed by the resistance of the voice coil, usually around 5 Ohms or so for an 8-Ohm speaker.
		Another interesting consequence of bridging is that the amplifier’s damping factor is cut in half when you bridge.
	www.1388.com /articles/tech_underAmp/page2/page2.html (1108 words)

	ssr#02-11
		In particular, if linear viscous damping is added to the structure, then the attached device does not contribute to the stiffness of the system because the damping force is out of phase with respect to the inertia and the restoring force.
		The damping factor C needed in the softened structure to obtain the same maximum displacement than the base case structure is shown in Figures 2(a)-(d) as a function of
		Thus, even though for SDOF the damping ratio required to produce the same displacement for a given stiffness reduction factor is considerably smaller for long period structures than for short period structures, the required damping constant per story might be similar in both types of MDOF structures.
	www.nsftokyo.org /ssr02-11.html (3086 words)

	Do all amplifiers sound the same?
		One of the most important factors, particularly when evaluating a particular tube amplifier with a particular set of speakers is the output impedance (Zout) of the amplifier, and the damping factor (DF) which results in connecting that amplifier to a particular speaker.
		Tremaine states: "There is no guarantee that a loudspeaker will sound better as the damping factor of the amplifier is increased beyond a certain figure, due to peaks in reproduction which may rise by some 10 or 12dB because of impedance variations"
		A floppy low end is an indicator of poor damping, as the result of a low level of negative feedback.
	www.kolumbus.fi /iain.churches/ThermionicThoughts/DampingFactor.html (305 words)

	Damping factor - whats the deal ???
		Damping factor was at one time considered to be more than adequate if the spec was a factor of 50:1.
		Any number stated for damping factor is an inadequate reference that cannot take into account the effects of a (totally unknown) dynamic speaker being connected to the amplifier and reproducing a signal that constantly fluctuates in level and frequency.
		Damping factor is calculated from the source impedance (output impedance); of the amplifier in relation to the nominal impedance load it is driving.
	forum.ecoustics.com /bbs/messages/1/297580.html (7096 words)

	Loudspeaker Cable
		The damping factor refers to the ratio of nominal loudspeaker impedance to the total impedance driving the loudspeaker.
		The damping is the ability of the amplifier to control the loudspeaker's motion after the signal has stopped.
		The effect of a lower damping factor usually is less controlled bass and unpredictable interaction in areas where the crossover is complex.
	www.proav.de /data/cables/speakercable.html (426 words)

	Lee's Biases - Car Audio (Site not responding. Last check: 2007-11-06)
		The damping factor is most often used as an indication of the ability of an amplifier to control the motion of a driver.
		The amplifiers with a higher damping factor will have a lower internal impedance so it will be closer to a short.
		Thus the amplifier with a higher damping factor will cause the driver to stop quicker than the amplifier with a lower damping factor.
	www.leecao.com /caraudio/amplifier.html (2931 words)

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