Some major brands are Boss, dbx, Berhinger, art and DOD.
I use Boss pedal equalizers. They are reliable, durable, and a great quality product.
Many brands of car graphic equalizers are offered at major chain stores at competitive rates. You have to compare the products and choose the one that appeals to you the most. Pyramid, Clarion, Boss, Kenwood, Pyle are among the best and most popular brands of car graphic equalizers You may find this link of immense use to make a comparison-http://www.sortprice.com/search-CQ-Car_Equalizers-Graphic_Equalizer.
I am a professional sound engineer and this is a somewhat generic question. The equalizer should be matched to the job is is required to do. Generally Klark Technic Ashley and DBX are higher quality brands.
Legacy have some good brands. Check out others here: http://www.bizrate.com/car-equalizers/
Starting at around $200, the Samson digital graphic equlizers are the highest rated. Pioneer is also an excellent brand!
In my opinion, Boss equalizers are the most consumer friendly products.
Boss Audio makes great equalizers that are safe to use on aftermarkets.
I like the dbx equalizers because the location of the connections is very convienient for installation.
Yes, all stereo head units come with equalizers built in.
In that old fashion equalizers use analog controls that can become corroded or break they are less reliable. The computer uses software based eq programs that are more reliable.
Equalizers can be both. Most likely it is a piece of equipment however the equipment may be digital and software driven. Equalizers are used to even out inconsistencies in other equipment like microphones speakers and even room dynamics.
Sears offers a wide range of major brands when it comes to their line of gas ranges. Some of their top names are GE, Kenmore, KitchenAid, LG and Frigidaire.