Cassette vs CD

d Units Overview

In a perfect world, your head unit would be used to provide a signal to your amplifiers that is line level and you would not use its internal amplifiers (if any),Lebron 9. They generally do not have the power and strength to drive speakers both loudly and cleanly. The line level signal is cleaner than the speaker level outputs on the head unit because it is does not go through the internal amplifiers in the head unit. That being said there are times where you would use the head unit’s internal power,http://www.lebron9.info/. One situation is to save money and the other situation is when you are building a system where the benefits of an amp are not important to you,Lebron 10. Read my planning page for more details about what is right for you.

No head unit generallyhas more than about 60watts of total output power because more would require a real DC-DC power supply (which does not fit in a head unit easily),Lebron 10 For Sale. Using the head unit power can be a temporary solution till a separate amplifier can be purchased, just make sure you do not try to power any subwoofers or insensitive component sets with the head unit’s built in power.

Note about using factory head units: A lot of people ask me about using the factory head unit that came with their car with external aftermarket amps. Typically you cannot get a clean signal from the head unit because factory heads do not have line level (RCA) pre-amp outputs to drive an amp,Lebron 10 Pure Platinum. You can use a speaker level to line level converter but the sound is still going through the factory head’s internal amps. Some are willing to sacrifice some sound quality in order to keep their factory head.

Things to look for:

Usability: Your head unit is the part of the car stereo that you interact with most so it is important to get one that “feels” nice to you. Always look at a head unit in a store display and use it for awhile. Try to flip through radio stations and tracks on a CD to see if it is quick and easy. If you have problems with small buttons, imagine what it will be like when you are driving! Models fall in the same price range, so usability is key deciding factor.

Power: Even though I just said not to use the built-in power of a head unit I know sometimes it is necessary. Bear in mind that the power specifications given by most manufacturers for head units are not accurate. They often use terms like “music power” or “peak power” which have no real meaning because there is no standard definition of those terms. If the power is quoted in “RMS” terms then it is usually valid. However, there is still one other place of misconception. Often manufacturers will quote power as “30watts x 4 RMS”. The “RMS” seems to mean it is a true indication of power but they are implying that all 4 channels can produce 30watts rms AT THE SAME TIME. With a head unit, this is almost always not true. Because of the small power supplies in head units they can rarely output more than 15-60 watts TOTAL. This means that the power to each channel at maximum loading would only be 1/4 of that total. Some manufacturers are better than others about giving valid specifications and a few models are available with sophisticated power supplies which have higher power output but they are VERY expensive. If you’re paying less than $800 for a head unit (and most of us are!) then your head unit will not put out much power. I have written a more comprehensive explanation of power amplifier specs as well. Speakers which are not producing bass do not draw nearly as significant power so you can get away with using the head unit to power them but use passive high pass crossovers (bass blockers) and they will play even louder and cleaner. Bear in mind that the distortion may be higher from the head unit than an external amp however.

Cassette vs. CD: This choice is mostly a matter of preference. If you do not have many cassettes then an in-dash CD player is ideal for you. If you need the capability to listen to cassettes and CDs then a cassette head unit with changer controls should be sufficient. Be aware that many in-dash C

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