The DDD603 stand-alone mastering meter includes the 1630 standard ballistics and overload indication, plus many additional features such as peak counter, phase meter, VU metering and more. Its extensive features made it a home with many top mastering studios including Bob Ludwig’s Gateway Mastering. The meter is software based and it’s upgradeable via firmware ROM. The meter dimensions are 1.43 x 5.25 (3U) x 5.5" (12 units fit into 19" rack). The unit is powered through an external international (100-240 VAC) power adaptor (included). DDD-603 is portable, can be placed on top of a console meter bridge, mounted in a console faceplate, or in a 19" rack (w/ custom hardware). Digital input and digital throughput are provided on two rear mounted XLR connectors. The meter accepts regular 44.1/48k and single hi-speed 96k AES/EBU or SPDIF inputs. RCA to XLR adaptor described in the manual is required for SPDIF signals. DDD603 works with any sample frequency between 25-100kHz and it’s manufactured in two physical configurations: horizontal and vertical. DDD603 Surround Meter Pack Option: 3 vertical stereo meters pack plus metal mounting brackets for surround 5.1 monitoring.