Great brands: Sundown Audio, AudioQue now known as "SoubdQuebed", Incriminator Audio, Skar Audio.
Hit and miss brand (rating vs true output): Hifonics, American Bass, Planet Audio, Audiopipe, Soundstream, DC Audio, Kicker, Kenwood, Pioneer, JL Audio
Brands i wouldn't buy: Boss, Lanzar, Power Acoustik, Sony, Dual... ect
I must respecfully disagree here... the Lanzar Opti series of amplifiers and components is awesome. Some of the Opti subs are decent as well.
1978 F250 2wd (460 c.i.d. / C6)- soon to give up the powerplant to an '80-'86 F150
White 2000 Grand Prix GT coupe One still slow and loud... other one scoots just a bit.