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The best LOC you can get is one that offers the features you NEED at a price that makes sense for what you get. Hands down the best LOC on the market is the LinkDQ from Wavtech! This magic box has everything an LOC should be, with the features that matter.
Our ABS Mounts were first created as a plug and play solution to go with our S.I.K Kits. After years of selling them and with no other solutions on the market, we decided to bring them back by themselves with a new design.
High level : AKA Speaker level is an amp that can handle an input voltage of 8-40v. This high output is common in factory amplified vehicles or where the
max voltage of a head unit is more than 10v. This is normally identified by a pigtail connection point or via the RCA on the amplifier (must check user manual to verify.) Some amps have a switch for this. NOT all amps have this feature.
Low Level: is 0-8v of signal voltage. This is most commonly found in aftermarket head units or other aftermarket units that use Can-bus. Most passive LOC units output 0-5v so they are considered a low level and are normally RCA to RCA. Modern day ACTIVE LOC units can output 0-10v of signal.
In conclusion an LOC works as an in-line filter that lets you control the signal, its intensity and in some cases the playable frequency range.
If your amp takes a high level and it is within the vehicles factory output range then you don't need an LOC unit and can wire in and out of your amp directly. In some Fords the signal can be flattened at the OB2, furthering the simplification of the installation.