A tonearm whose effective mass is rated between 11 and 25 grams is considered moderate mass (e.g. Since effective mass of different Reed models can be from 8 g to 25 g. Contribute to whzhangg/effective_mass_calculator development by creating an account on GitHub. The resonant frequencies calculated by the evaluator are applicable only to those measured at 10Hz. If it isn't, expect attenuated low frequencies as more energy is transmitted into the tonearm and less is converted into the electrical signal. Effective mass 12,7g (3009-R), 12,8g (3010-R) or 14g (3012-R). The excursion overshoot is spread from 5 to 15 Hz. 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 / … 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. This likely limits the aftermarket options. There is a lot of online tools and quick formulas for calculating tonearm resonance 1 , unfortunately these are mostly not correct – or they are correct enough, as they are based on estimates and approximations. RB330 User Manual 786KB pdf 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. distance between needle tip and spindle axis. Sound depends on how many parameters were taken into account. 236.5 mm. 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. Arms above 25 grams of mass are high mass in nature (Eminent Technology, Dynavector). A tonearm whose effective mass is rated between 11 and 25 grams is considered moderate mass (e.g. SME 309, IV, IV-Vi, V, Triplanar, Graham). A mass of 11-25 grams is considered moderate mass, and an arm rated at above 25 grams is considered high mass. Where M is the mass of the arm, CW is the mass of the cartridge, FW is the mass of the screws, nuts, spacers, washers, shims and C is the compliance of the cartridge. THE PHYSICS OF EFFECTIVE MASS. Say, a DL-103 on a light arm. rfgumby. Short sharp excursion overshoot at 2-3 Hz. Designed using the latest 3D CAD & CAM technology, the new RB330 is the culmination of more than 35 years of tonearm design experience. Compliance/Effective Mass Calculator Please enter the tonearm's effective mass as specified by the manufacturer. 14.5 mm. The effective mass for conductivity calculation is the mass which is used in conduction related problems accounting for the detailed structure of the semiconductor. The Gear To carry on with the research, we built the device shown in Figure 2 (you can see its picture in the top-right of the article). 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. the 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. c – compliance of the cartridge. The aluminum arm tube is both light rigid while the two-piece aluminum headshell with adjustable azimuth allows for the accurate alignment of any phono cartridge type. In the case of the SME 3009 Improved with fixed head shell, the arm is rated to have an effective mass of 6.5 grams. We've decided to use our own ceramic headshell to minimize the headshell influence and to be conservative. frez - resonant frequency of tonearm mef - effective mass of tonearm mc - weight of cartridge ms - mass of the screws, nuts, spacers, washers, shims c - compliance of the cartridge. Set the anti-skating device to the same figure as your arm’s tracking weight. To use the resonance evaluator simply enter your tonearm's effective mass in the text box and press submit. Effective Mass. Effective Mass. * A phono cartridge whose compliance is rated at 12 x l0ˉ6 or below, is considered low compliance. Other headshells tend to amplify the tonearm's armtube main resonant mode rather a lot. Offset Angle 21.55 ° Overhang. 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. m c – weight of cartridge. If it is given without a cartridge and headshell, please enter their respective masses too. Published compliance figures are measured at frequencies such as 0 Hz, 10Hz or 100Hz. From what I have been able to learn without owning a DL103 or 103R, there is almost no limit to the effective mass that those cartridges might "like". 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. 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. This topic bothered me a long time, especially when it seemed more or less impossible to find specific data about the effective mass of the stock Lenco (L75) arm. Where M is the mass of the arm, CW is the mass of the cartridge, FW is the mass of the screws, nuts, spacers, washers, shims and C is the compliance of the cartridge. In the booklet he recommends a tonearm resonance frequency between 8 and 16 Hz, 11 being ideal. We've decided to use our own ceramic headshell to minimize the headshell influence and to be conservative. Effective mass = 4.4g + 9g for cartridge, mounting hardware and headshell weight . Downloads. * A phono cartridge whose compliance is rated at 12 x l0ˉ6 or below, is considered low compliance. The effective mass of my SME V-12 arm is specified as 12g. Another example is the calculation of the shallow impurity levels using a hydrogen-like model. Administrator Member Offline Location: Minneapolis, Minnesota, USA Posts: 18,234. A mass of 11-25 grams is considered moderate mass, and an arm rated at above 25 grams is considered high mass… 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. Database Database Tools Resonance Evaluator Record Equalization. For a tonearm without a removeable headshell, leave the last field empty unless you use particularly heavy mounting hardware. You can therefore figure if you are increasing or decreasing total effective mass by comparing the delta mass to … For full technical specifications, download RB880 User Manual below. Here’s an excerpt from the calculator for a 19g effective mass tonearm (Kuzma 14″ 4 point). m ef – effective mass of tonearm. These calculations include mobility and diffusion constants calculations. SME 309, IV, IV-Vi, V, Triplanar, Graham). Moderate mass tonearms** are good companions for moderate to low compliance cartridges. Low mass arms* mate well with both moderately high and very high compliance phono cartridges. 14.5 mm. 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. 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