Say, a DL-103 on a light 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. 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. For example, a Grado F3+ on a vintage Micro-Trak arm. This is highly unusual. AT95e compliance = 20. gives resonant frequency of 9.7 hz - pretty shit hot! Effective Mass. variable tonearm mass with 2 different counter weights. To use the resonance evaluator simply enter your tonearm's effective mass in the text box and press submit. Administrator Member Offline Location: Minneapolis, Minnesota, USA Posts: 18,234. The minimum effective mass when so used is around 3.75 grams. 3.5 out of 5 stars Best Sellers Rank Tonearm Resonant Frequency can be calculated using following formula: where: f rez â resonant frequency of tonearm. The range of "acceptable" or optimal resonant frequency will vary somewhat depending on who you ask. Effective Mass The effective mass is the mass of the tonearm, including the headshell, seen by the stylus. 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. But in trying to optimize the sound I need to know the tonearm resonance frequency which requires knowing the effective mass of the tonearm. Published compliance figures are measured at frequencies such as 0 Hz, 10Hz or 100Hz. Dear Badcap: Go up but the change in the effective mass will be small due that the counterweight is near the tonearm pivot. 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. Learn the definition of center of mass and learn how to calculate it. Expect no bass and really poor tracking as acceleration's off into the stratosphere. It pulls the tonearm out a little bit, effectively balancing the â¦ Effective mass is the moment of inertia divided with distance to spindle (or Effective Length) to the power of 2: EM = MI / EL 2 Where MI is Moment of Inertia and EL is effective length. 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. 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. The Technics 1200 manual says the tonearm's effective mass is 12 grams without cartridge, that the headshell is 7.5 grams, and that cartridge+headshell weight can be up to 20.5 grams, so I guess using the standard 1200 tonearm is out (I'm sure that's obvious to many of you). Effective tonearm lenght in mm (from the tonearm pivot to the stylus) 304.8: Mounting distance (from the tonearm pivot to the spindle) 291.6: Offset angle (between a groove and the stylus direction) 18° Overhang in mm (from the spindle to the stylus) 13.2: Effective tonearm mass in grams 17,2 18,5 19,5 (including Alu headshell) 19.5 Cartridge Database and Tools © OGVCW Software 2005-2009, Design and Content © Vinyl Engine 2002-2020, HiFi Engine | FAQ | Site Policy | Advertising | Cookie Options. Here was cited 9-11Hz, several say 8-12Hz, FKuzma says 6-16Hz. Arms above 25 grams of mass are high mass in nature (Eminent Technology, Dynavector). This device adds a force to your tonearm preventing it from skipping (or âskatingâ across) the grooves. To make music lovers enjoy a 16"tonearm, I developed the EMT 16" tonearm. There is a lot of online tools and quick formulas for calculating tonearm resonance 1 , unfortunately these are mostly not correct â or they are correct enough, as they are based on estimates and approximations. 236.5 mm. Acceleration: your line should be in the green zone. Featuring a brand new bearing housing and our latest tonearm tube designed using intelligent redistribution of mass, ensure this arm will â¦ SME 309, IV, IV-Vi, V, Triplanar, Graham). Please enter the tonearm's effective mass as specified by the manufacturer. SA-750D effective mass is 13.48gr without cartridge( effective mass is 19.23gr with 6.5gr cartridge). A tonearm whose effective mass is rated between 11 and 25 grams is considered moderate mass (e.g. 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 / â¦ Low mass arms* mate well with both moderately high and very high compliance phono cartridges. 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. Effective mass 12,7g (3009-R), 12,8g (3010-R) or 14g (3012-R). In the booklet he recommends a tonearm resonance frequency between 8 and 16 Hz, 11 being ideal. Original arm (effective mass ~23g) with 6g cartridge has effective mass ~28g and then according Ortofon only 10-15 um/Nm cartridges (tracking force > 2g) are recommended. The effective mass for conductivity calculation is the mass which is used in conduction related problems accounting for the detailed structure of the semiconductor. If I want to get closer to 10 Hz, I need to increase the effective mass of the arm/cartridge to 31.7g. Well, frequency, mass and compli- ance donât tell us much, what we need is â¦ Armtube material can suppress these parasitic accoustic vibrations (and of course, tonearm's effective mass depends mainly on armtube material). Contribute to whzhangg/effective_mass_calculator development by creating an account on GitHub. Moderate mass tonearms** are good companions for moderate to low compliance cartridges. Arms above 25 grams of mass are high mass in nature (Eminent Technology, Dynavector). The amplitude of stylus movement is given as 0.1mm. Set the anti-skating device to the same figure as your armâs tracking weight. Using these figures in the calculator I get a resonance frequency figure of 11.486 Hz. 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. Compliance/Effective Mass Calculator Please enter the tonearm's effective mass as specified by the manufacturer. Database Database Tools Resonance Evaluator Record Equalization. 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. Dear Badcap: Go up but the change in the effective mass will be small due that the counterweight is near the tonearm pivot. Low / 11 g. Mounting Distance (platter centre to arm hole centre) 222 mm. 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 â¦ Please note that for some Japanese cartridges, the dynamic compliance given at 100 Hz is a completely different measure, given to estimate the tracking at specified downforce. Jelco publishes its effective mass (13.5g), so that should make our calculations easier. c â compliance of the cartridge. 40 gram effective mass, 40 Î¼m/mN compliance. Tonearm is mechanical, acoustical and electronic system. I have already been told my just purchased ZYX R100FS (Fuji Silver high output) is a good match for the tonearm. ... Tonearm effective mass calculation. Main counterweight position can be adjusted by turning small knurled dial at rear of arm. To wit, I asked a dealer about the effective mass of the Talea. Downloads. 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. Effective Mass. Clearaudio Satisfy Black Tonearm The Satisfy Black tonearm features high-quality, handmade Swiss vertical and lateral bearings composed of polished sapphire. That result will be in the cell with the appropriate labels on the top row and left column. Since effective mass of different Reed models can be from 8 g to 25 g. Everything above the green zone is an "overshoot", when the movement of the headshell is larger than that of the stylus. some tools to calculate the effective mass. For full technical specifications, download RB330 User Manual below. Hereâs an excerpt from the calculator for a 19g effective mass tonearm (Kuzma 14â³ 4 point). 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 Offset Angle 21.55° Overhang. Effective Mass. Hereâs an excerpt from the calculator for a 19g effective mass tonearm (Kuzma 14â³ 4 point). Matching tonearm with cartridge: Compliance, effective mass, resonance frequency. therefore tonearm makers rate their arms in terms of effective mass before a cartridge is mounted. 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. 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. The effective mass of my SME V-12 arm is specified as 12g. 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. Main parameters are: Effective length, Effective mass, Moment of â¦ Calculation of Inertia. If I use the 10 g auxiliary weight that screws into the back of the arm (behind the counterweight), does this change the effective mass of the arm to 22 grams? My AirTight Supreme cartridge weighs 12g and has a compliance specification of 8. The effective mass on a Technics SL-1200 / SL-1210 tonearm is 12 grams (7.5 g headshell, 4.5 g arm). A small overshoot at about 5 Hz should be harmless. The excursion overshoot is spread from 5 to 15 Hz. Jelco publishes its effective mass (13.5g), so that should make our calculations easier. To use the resonance evaluator simply enter your tonearm's effective mass in the text box and press submit. Sound depends on how many parameters were taken into account. Barrel-shaped main counterweight. Offset Angle 21.55 ° Overhang. 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. 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. For a tonearm without a removeable headshell, leave the last field empty unless you use particularly heavy mounting hardware. 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. The resonant frequencies calculated by the evaluator are applicable only to those measured at 10Hz. THE PHYSICS OF EFFECTIVE MASS. The set of parameters of this system determine characteristics of tonearm. 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. Main counterweight can be split into two pieces to change the range of acceptable cartridge mass (two different removeable pieces are available : 64g, 77g). rfgumby. Other headshells tend to amplify the tonearm's armtube main resonant mode rather a lot. We know the distance from pivot point to the tip of the tone arm (the effective length, 230mm for my Technics SL-1200). 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. RB330 User Manual 786KB pdf 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. 14 gram effective mass, 5 Î¼m/mN compliance. 35 gram effective mass, 15 Î¼m/mN compliance. The "Compliance" field is for the cartridge compliance. 14.5 mm. Data Sheets Building Design Turntable Wands Surface Pdf Classic Crafts Record Player Table. For full technical specifications, download RB880 User Manual below. 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. â¦ Other headshells tend to amplify the tonearm's armtube main resonant mode rather a lot. The effective mass of the Jelco 750D 9â³ tonearm with the standard headshell but without cartridge is 13.48g.. 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. 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 â¦ Desired Tonearm Mass Calculator: Cartridge compliance[cu] Desired resfreq [Hz] (Total)Effective Mass needed[gr] It is interesting to note that Poul Ladegaard of 'Bruel og Kjaer' determined empirically that the 'best" resonance frequency would be much higher (15Hz to 18Hz) than what is normally considered desirable. As 0 Hz, I asked a dealer about the effective mass 10... Tonearm 's effective mass tonearm ( Kuzma 14â³ 4 point ) tonearm effective mass calculator specifications, download RB330 User Manual below Kuzma... Frequency of tonearm we 've decided to use our own ceramic headshell to increase effective mass. 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