early SME’s, Grace 747, Ortofon AS-309S, RS-309D, TA-110 and TA-210). Moderate mass tonearms** are good companions for moderate to low compliance cartridges. Ilkka, "Luckydog" made a tonearm effective mass calculator over at vinylengine.com. If you need a significant change in the tonearm effective mass and if you can then you have to do it at the tonearm headshell position. AT95e compliance = 20. gives resonant frequency of 9.7 hz - pretty shit hot! Everything above the green zone is an "overshoot", when the movement of the headshell is larger than that of the stylus. RB880 User Manual 349KB pdf Downloads. The amplitude of stylus movement is given as 0.1mm. Tracking might also suffer as the tonearm has to work a lot harder. Tonearm is mechanical, acoustical and electronic system. Well, frequency, mass and compli- ance don’t tell us much, what we need is … A small overshoot at about 5 Hz should be harmless. Main parameters are: Effective length, Effective mass, Moment of … Effective mass - Low / 11g Overhang 17.2mm Mounting distance platter center to arm hole center 222mm Product information Product Dimensions 12 x 4 x 3 inches Item Weight 0.388 ounces ASIN B01CPSJCCG Customer Reviews: 3.5 out of 5 stars 5 ratings. Say, a DL-103 on a light arm. Clearaudio Satisfy Black Tonearm The Satisfy Black tonearm features high-quality, handmade Swiss vertical and lateral bearings composed of polished sapphire. Low / 11 g. Mounting Distance (platter centre to arm hole centre) 222 mm. Inertia is in part proportional to the mass of the counterweight, and to the square of the distance of the counterweight from the pivot point. Effective Mass The effective mass is the mass of the tonearm, including the headshell, seen by the stylus. In general terms, arms with high effective mass fitted with cartridges of high compliance result in resonant frequencies that fall below the ideal range. The set of parameters of this system determine characteristics of tonearm. A mass of 11-25 grams is considered moderate mass, and an arm rated at above 25 grams is considered high mass. In the returned table, each column represents the cartridge and fastener weight as denoted at the top of the table, while each row represents the cartridge compliance as denoted by the value in the left most column. SA-750D effective mass is 13.48gr without cartridge( effective mass is 19.23gr with 6.5gr cartridge). Effective Mass. For full technical specifications, download RB880 User Manual below. Compare this to the Thorens TP16 Mk 1 tonearm which has a rated … Funny thing: During the build I pondered over how to set VTF as with the CW arrangement I had this could not be easily done behind the pivot, so I opted for the weight at the stylus end. As an example, if we had an arm/cartridge with a combined mass of 15.8g, and a cartridge with a compliance of 10, the resonant frequency would be 12.45 Hz. Compliance/Effective Mass Calculator Please enter the tonearm's effective mass as specified by the manufacturer. These calculations include mobility and diffusion constants calculations. A medium-to-high mass arm, with a 10-11g effective mass, its use of materials has been optimised to provide maximum structural resonance control and rigidity. Manufacturer Model Effective Length Overhang Mounting Distance Cartridge Weight Arm Mass VTA Adjust Mounting Pattern Offset Null Points inner/ outer Alphason HR 100 S 229 18 24 211 3-20 10 y linn 65.6 / 120.6 Alphason Opal 229 18 24 211 3-20 linn 65.6 / … The effective mass is the mass of the tonearm, including the headshell, seen by the stylus. Logged Wout. In the returned table, each column represents the cartridge and fastener weight as denoted at the top of the table, while each row represents the cartridge compliance as denoted by … Since effective mass of different Reed models can be from 8 g to 25 g. Calculation of Inertia. Note that the effective mass of your tonearm should be specified by the manufacturer and similarly, your cartridge weight and compliance should also be specified by the cartridge manufacturer. Effective mass = 4.4g + 9g for cartridge, mounting hardware and headshell weight . ... Tonearm effective mass calculation. Designed using the latest 3D CAD & CAM technology, the new RB330 is the culmination of more than 35 years of tonearm design experience. Armtube material can suppress these parasitic accoustic vibrations (and of course, tonearm's effective mass depends mainly on armtube material). Re: Effective Mass Tonearm Mod For Mono Cartridges by Brf » Sat Mar 14, 2015 11:35 am If you are ordering a 10 inch metal arm, change your order to include the optional stainless steel arm tube over the standard aluminum with black shrink wrap. Published compliance figures are measured at frequencies such as 0 Hz, 10Hz or 100Hz. There are many dogmatic “rules” regarding the placement of tonearm counterweights, such as “the counterweight should always be as close as possible to the pivot”. As an example, if we had an arm/cartridge with a combined mass of 15.8g, and a cartridge with a compliance of 10, the resonant frequency would be 12.45 Hz. I have used calculations similar to the above "Tonearm Effective Mass" calculator at Vinyl Engine to consider the optimum "Total Effective Mass" for a given phono cartridge compliance. Doing that ALSO will increase the effective mass of the tonearm, by a factor equal to the square of the change in distance from the pivot to the center of mass of the CW, times the mass of the CW. 14.5 mm. The effective mass of my SME V-12 arm is specified as 12g. That result will be in the cell with the appropriate labels on the top row and left column. What do we know? The latter is essential to hold the cartridge firmly so that as much musical groove information as possible is transformed to its electrical equivalent and fed to the preamp. Effective mass: 13.4 gr: Range of height adjustment (distance between the arm base bottom and center of the arm pipe) 38~60 mm: TK-850S - Jelco TK-850S 9" Static-balance with knife edge tonearm - F e a t u r e s : Bearing for vertical direction equipped super steel metal KNIFE EDGE system. Clearaudio Satisfy Black Tonearm The Satisfy Black tonearm features high-quality, handmade Swiss vertical and lateral bearings composed of polished sapphire. I did find some info however, and The resonant frequencies calculated by the evaluator are applicable only to those measured at 10Hz. A tonearm whose effective mass is rated between 11 and 25 grams is considered moderate mass (e.g. Expect no bass and really poor tracking as acceleration's off into the stratosphere. To use the resonance evaluator simply enter your tonearm's effective mass in the text box and press submit. = ⋅ 1 2π where F is the frequency, M is the mass and C is the compliance. The effective mass of a tonearm in combination with the compliance of the cartridge cantilever serves to determine where the resonant frequency of a given tonearm/cartridge match up will be. Re: Effective weight - how to measure Other headshells tend to amplify the tonearm's armtube main resonant mode rather a lot. Tonearm Effective Mass H CF Step 5 V Step 6 Calculate the effective tonearm mass Enter mass of cartridge & fixings in grams If tonearm has detachable headshell, detach & weigh (without cartridge) Measure distance L from stylus to pivot in cm, or lookup effective length specification Remove counter weight and weigh it We know the distance from pivot point to the tip of the tone arm (the effective length, 230mm for my Technics SL-1200). Tonearm Resonant Frequency can be calculated using following formula: where: f rez – resonant frequency of tonearm. To find the resonant frequency for any combination find the cell that is the intersection of the desired cartridge weight and compliance. (Cartridge/stylus guard mounted to tonearm + Tonearm) - counter weight (removed) = Total Effective Mass (Cartridge + Arm) Total Effective Mass - Cartridge/stylus guard weight = Tonearm Effective Mass Arms like the Vertere SG-1 have a sliding weight on the arm which allows fine-tuning of the tracking force, but also allows adjustment of the arm's effective mass. Effective Mass. In the same ballpark the spindle height is also taller than I've experienced possibly limiting the weight/clamp options too, I've been eyeballing a Bren1. Arms above 25 grams of mass are high mass in nature (Eminent Technology, Dynavector). The confounding reports of apparent tonearm/cartridge mismatches that sound great have me thinking about the quality of the data for compliance and tonearm effective mass that we start with. Cartridge Compliance/Arm Mass chart The following is a quick reference for Soundsmith cartridges and tone arm mass matching; The simple rule is that the LIGHTER the … 14 gram effective mass, 5 μm/mN compliance. To make music lovers enjoy a 16"tonearm, I developed the EMT 16" tonearm. A tonearm whose effective mass is rated between 11 and 25 grams is considered moderate mass (e.g. My AirTight Supreme cartridge weighs 12g and has a compliance specification of 8. Return and secure the tonearm. Dear Badcap: Go up but the change in the effective mass will be small due that the counterweight is near the tonearm pivot. Acceleration: your line should be in the green zone. c – compliance of the cartridge. Effective Mass. Using theoretical calculators (good science) suggests that actual performance is improved by … Sound depends on how many parameters were taken into account. The effective mass on a Technics SL-1200 / SL-1210 tonearm is 12 grams (7.5 g headshell, 4.5 g arm). 40 gram effective mass, 40 μm/mN compliance. This tonearm does not have a fixed effective mass, but is variable due to its different counter weights and the distance to the pivot point of the tonearm It is one of the very rare tonearms with variable mass worldwide.A tonearm with variable effective mass, which makes it possible to use all cartridges with low compliance or with high compliance. Here’s an excerpt from the calculator for a 19g effective mass tonearm (Kuzma 14″ 4 point). 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