NOT RECOMMENDED:
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Boss
DHD
Dual
Jensen
Legacy
Optimus (Radio Shack)
Lightning Audio (lower end models)
Pyle
Pyramid
Sony
Soundstorm
Thump
Verge
Volfenhag
AVERAGE:
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Bazooka
X-site
MA Audio Visonik Cliff Designs (Anaba Group) (Execpt for high end amps)
Low end Alpine
Kenwood
Lightning Audio (high end)
Pioneer (minus high end head units and premier series)
Lanzar
Audiobahn
Crunch
MTX (minus amps)
Panasonic
Rockford Fosgate
Blaupunkt
Kicker (subs)
Alpine (low end subs and speakers)
Polk
Audiopipe
Concept
Cerwin Vega
Infinity
Alphasonik
Digital Audio
JVC
GOOD:
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Autotek
Hifonics (for the price)
MTX (amps)
Profile (price is AWESOME)
Pioneer premier and high end HU’s
Ma Audio, Visonik, and Cliff Designs high end amps (especially for SPL applications)
Phoenix Gold
Directed
Orion
PPI
Viper
Alpine (higher end subs and speakers, lower end head units)
Kicker amps
Avionixx
Alumapro
Audiomobile
Boston
Clarion
Crystal
Crossfire
Earthquake
JBL
Memphis
Soundstream
MB Quart
HIGHLY RECOMMENDED:
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Alpine (higher model head units)
Cadence
Eclipse
JL Audio
Elemental Designs
Helix
a/d/s
Adire Audio
Arc Audio
Brax
CDT
Diamond
DD
Focal
Image Dynamics
Kove (borderline good/highly recommended)
McIntosh
MMATS
Morel
OZ Audio
PPI (old stuff before they were directed)
RE Audio (resonant engineering)
US Amps
Zapco
Linear Power
Incriminator Audio
Ascendant Audio
Stereo Integrity
Sound Splinter
Audioque
Xtant
Tru Technology
TC Sounds
Rainbow
BOLD means that this is a brand we talk good of frequently on this board and is within most people's price range. A lot of these products will be recommended.