User manual RANE BB 22

[. . . ] DATA SHEET / MANUAL BB 22 BALANCE BUDDY General Description The Rane BB 22 Balance Buddy is a handy professional-grade tool used to provide isolation for and convert unbalanced -10 dBV consumer level RCA outputs up to balanced +4 dBu professional XLR inputs. Unbalanced lines should always be kept under 10 feet (3 meters) to prevent undesirable effects such as hum and noise. [. . . ] load impedance +4 dBu out Exempt Class 2 equipment Exempt passive device Exempt extra low voltage device (4. 2 cm x 13 cm x 10. 8 cm) (. 45 kg) (9. 5 cm x 30 cm x 18 cm) (. 9 kg) +10 (40 Hz-20 kHz); +4. 5 (20 Hz) +24 (40 Hz-20 kHz); +18. 5 (20 Hz) (Load Impedances as Shown) 1k 0. 5 47. 5 / 200 20-20 kHz less than . 05 (40 Hz-20 kHz) UL/CSA CE-EMC CE-Safety Unit: Construction All Steel . . . . . . . . . . Size 1. 65"H x 5. 1"W x 4. 25"D . . . . . . . . . . Weight 1 lb Shipping: Size 3. 6" x 11. 75" x 7. 2" . . . . . . . . . . Weight 2 lb All specifications apply both directions, unless noted. WEAR PARTS: This product contains no wear parts. 0. 5dB 0. 5dB 5% 0. 1 10% ±2 max dBV dBu dB dB % Data Sheet-1 BB 22 BALANCE BUDDY Application Information Conversion Ratio The casual observer would think to convert -10 dBV to +4 dBu, you would need 14 dB of gain. The reason is not only do you change levels, you also change reference levels--from dBV to dBu. The first (dBV) references everything to 1. 0 volt, while the second (dBu) references everything to 0. 775 volts (this comes from the old power reference of 0 dBm, which equaled 1mW into 600 , which equaled . 775 volts). Driving Impedances Some people wrongly feel you cannot use a transformer to convert between -10 dBV and +4 dBu because of low impedances. This is not a problem as long as you use them to interconnect equipment with at least 15k ohms input impedance. Since most professional products have input impedances of 20 k or greater (50k and 100 k are not uncommon), this should never be difficult. A 15 k load winds up looking like 1 k to the equipment with the -10 dBV output (due to transformer action). The maximum transformer output level of +24 dBu occurs with an input level of +10 dBV, which equals 3. 16 volts. And 3. 16 volts driving 1 k only requires 3. 16 milliamps, which is a very modest requirement for any -10 dBV equipment to deliver. [. . . ] MADE IN U. S. A. 1 OUTPUT 1 INPUT 1 OUTPUT 2 2 INPUT 2 -10dBV +4dBu +4dBu -10dBV ACN 001 345 482 1. 636" BB 22 BALANCE BUDDY ©Rane Corporation 10802 47th Ave. W. , Mukilteo WA 98275-5098 USA TEL 425-355-6000 FAX 425-347-7757 WEB www. rane. com Data Sheet-2 All features & specifications subject to change without notice DOC 102929 4. 225" 2. 5" [. . . ]