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Step 1
Make sure that the head unit you are buying has RCA preamplifier outputs for an amplifier, and is capable of playing all your WMA as well as MP3 files. It should also have theft deterrents such as a flip-down face or even a detachable screen.
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Step 2
Research dual head units to find one that best suits your needs. Read customer feedback online. People are happy to share their likes and dislikes about any product, which can save you from going through the experience of a bad buy yourself.
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Step 3
Go to big box stores to check out what they have. There, you may also listen to the dual head units, so you can get an idea of how it might sound.
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Step 4
Check out catalogs or sites like Crutchfield or Tweeters where a wide variety of dual head units are offered, as well as advice on installing your unit.
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Step 5
Explore custom car sound system stores. Dual head units that might not be available at regular stores might be offered. And, since the store specializes in sound systems for vehicles, you can not only see a huge variety of dual head units, but also get expert advice.
