A DMM does WAY more things that a DD-1 can do. The DD-1 is a specific tool.
Most common car audio uses for a DMM is checking voltage (AC and DC) and checking ohm loads. It can also be used to set gains and is used to clamp (see what kind of power it's making) amps, in part with a clamp meter.
10 inches of terror
One DD 9510F + one kicker zx2500=150+ db
One Sundown SA-8 + 2 mb quart 2000's = 150+ db
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-2006, 2007, 2009, and 2010 MECA World Champion
-2008 Bassrace 130-139.9 National Champion