Symposium Acoustics
Rollerblock Jr.
The Rollerblock Jr. is Symposium Acoustics' compact ball-bearing isolation "coupler/decoupler," using a single hardened ball sandwiched between two opposing cupped aluminum discs to laterally isolate components, speakers, or racks from mechanical vibration without adding audible coloration. A set consists of six tops/bottoms and three center bearings forming three double-stacked units, and it is available in a standard steel-ball version and a higher-load "HDSE" (Heavy Duty Special Edition) version with tungsten-carbide bearings (Symposium Acoustics; Positive Feedback).
MSRP
$169
Used market · Good
$250
MSRP to used market
From $169 at launch to $250 today.
Specifications
- Price
- $169/set of 3 (Version 1.1, per 2005 SoundStage! review); HDSE $349/set of 3
- Mounting
- Version 1.1 includes a ¼-20 threaded hole centered on the face opposite the bearing cup, for screw-mounting to equipment feet or wood cabinets via hanger bolts
- Dimensions
- 1.875" diameter (4.76 cm) × 5/8" thick (1.58 cm)
- Applications
- Digital sources, preamps, amplifiers, shelves/platforms, turntables, power supplies/AC conditioners, loudspeakers and subwoofers; works on carpet, including deep-pile
- Ball bearing
- Super-precision Grade 10 tungsten carbide balls, designated "Rollerblock JR+" or standard on the HDSE
- Body material
- Top-grade 7075 aircraft aluminum with a "hard coat" anodized skin, for double or triple the weight capacity of the standard version
- Configuration
- Set = 6 tops, 6 bottoms, 3 center bearings, forming 3 double-stacked isolator/coupler units
- Manufacturing
- Made in the USA
- Weight capacity
- ~50 lb per unit and up; conservative set-of-3 rating of 150 lb (70 kg); set-of-4 rating of 200 lb (90 kg); HDSE handles double-to-triple the standard load
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