A lot of people also don't want to lose their heads up displays or seperated displays often found with factory head units.
Well now there is an easy way to retain your factory head unit, and add amplifiers or subwoofers (or both).
Well known audiophiles Navone Engineering have released a two channel line driver dubbed the 'NE-7V' which is a high to low level convertor whilst retaining fantastic sound quality through it's circuitry and line driver capabilities.
QUOTE
The Navone Engineering NE-7V is a stereo, full-range speaker level to pre-amp level line output adapter with balanced and/or common outputs, full transformer isolation, an adjustable output signal level that ranges from zero up to 9.5 Volt Maximum RMS, and a powerful infrasonic filter on the bottom end.
The inputs of the device connect to the car's left and right speaker leads that are provided, and the gold-plated RCA female chassis mount outputs feed into the input of an aftermarket equalizer, electronic crossover, or power amplifier.
The fully isolated circuitry eliminates DC ground loops and provides excellent coupling with a high input impedance. The source impedance of the Navone Engineering NE-7V is low enough to be considered a competition grade component.
The output range adjustment (0 to 9.5 Volts) permits a wide range of OEM decks to perfectly interface with a wide range of aftermarket components. However, we highly recommend leaving the trim pots at the MAX level.
The NE-7V's circuitry was designed by David Navone and Richard Clark of Autosound 2000. This high-quality Line Output Converter can be used in high-end competition and demo systems to couple the audio from the OEM factory deck into an aftermarket power amplifier.
The inputs of the device connect to the car's left and right speaker leads that are provided, and the gold-plated RCA female chassis mount outputs feed into the input of an aftermarket equalizer, electronic crossover, or power amplifier.
The fully isolated circuitry eliminates DC ground loops and provides excellent coupling with a high input impedance. The source impedance of the Navone Engineering NE-7V is low enough to be considered a competition grade component.
The output range adjustment (0 to 9.5 Volts) permits a wide range of OEM decks to perfectly interface with a wide range of aftermarket components. However, we highly recommend leaving the trim pots at the MAX level.
The NE-7V's circuitry was designed by David Navone and Richard Clark of Autosound 2000. This high-quality Line Output Converter can be used in high-end competition and demo systems to couple the audio from the OEM factory deck into an aftermarket power amplifier.
This unit can be used directly off the back speaker high level input wires (at the boot), or directly off the back of the factory head unit. You then have nice low level (RCA) outputs for amplifiers.
Whilst there are many products of this nature on the market, the NE-7V is regarded as a great way to do this without introducing noise, and it also offers high voltage RCA outputs for the best possible noise rejection.
Available Right Here RRP $49.95 AUD - On Special for $39.95
UPDATE:
The 4 channel version of this is now available!
QUOTE
The NE-774V is a competition quality, four-channel OEM to aftermarket stereo adaptor that was designed to connect the speaker level outputs of a factory deck into the pre-amp level inputs of an aftermarket equalizer, electronic crossover, or power amplifier. The signal level of the NE-774V can be adjusted from a maximum of 9.5 Volts rms down to zero volts. The NE-774V replaces our previous N-774V and the main difference is in the Plug and Play wiring and connectors. The circuitry is identical to the 2-channel N-7V and N-777. Notice that the signal level adjustment pots are inside the plastic enclosure. Simply squeeze the lid for access to the adjustment pots. Turning the pots clockwise increases the signal level. We recommend leaving the internal pots at the maximum level unless there is a good reason to decrease the level. The NE-774V features full transformer isolation with a maximum useable signal level, and a smooth frequency response -- which means more signal and less noise. The NE-774V includes compensation for both frequency and phase with no loss of bass or treble. The maximum signal level output of the NE-774V is 9.5 Volts per channel. This is an incredible level and amounts to over 4 times the signal level of a typical aftermarket deck with only 2 Volts of signal. The NE-774V is the best LOC (Line Output Converter) in the world.
Available Right Here RRP $59.95 AUD - On Special for $49.95
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Looking for even better Sound Quality?
Well couple either of these line level convertors with a competition line driver, to bring your factory integrated head unit up to the quality of aftermarket units.
QUOTE
The N-645 Stereo Line Driver was designed by David Navone, Richard Clark and Paul DeMint for serious competition and demonstration systems. The N-645 features a fully isolated bi-polar power supply, flat bandwidth from 20 Hz up to 25 kHz, infra-sonic filtering on the bottom end, very low source impedance, and soft turn-on/off circuitry.
The power connections are fed into the N-645 via an RJ-11 modular jack and plug. The signal connections into and out of the N-645 are gold-plated female RCA chassis mount jacks. The noise floor, source impedance, and S/N specifications of the N-645 are among the best measurements in car audio components.
The N-645 Line Driver has separate gain adjustments for the Left and Right channels. With a maximum signal level of around 10 Volts rms, this 3.5” x 2.5” x 1” component will boost CD, MP3, DVD, etc. players up to competition quality levels. Also with the very low source impedance of the N-645, it’s possible to lower the noise level in some systems. For instance, with a deck that has an output impedance of 600 Ohms or more, adding a line driver with a low output impedance will “push” the signal through the system less affected by accessory noise. In such applications, it’s important to install the line driver as close to the deck, or other source, as possible. We've had great success targeting systems with OEM decks using LOCs with relatively high output impedances. The N-645 placed just after the LOC can really convert the OEM deck into a competition quality deck.
This item is Special Order. Delivery Time ~ 14 days.
The power connections are fed into the N-645 via an RJ-11 modular jack and plug. The signal connections into and out of the N-645 are gold-plated female RCA chassis mount jacks. The noise floor, source impedance, and S/N specifications of the N-645 are among the best measurements in car audio components.
The N-645 Line Driver has separate gain adjustments for the Left and Right channels. With a maximum signal level of around 10 Volts rms, this 3.5” x 2.5” x 1” component will boost CD, MP3, DVD, etc. players up to competition quality levels. Also with the very low source impedance of the N-645, it’s possible to lower the noise level in some systems. For instance, with a deck that has an output impedance of 600 Ohms or more, adding a line driver with a low output impedance will “push” the signal through the system less affected by accessory noise. In such applications, it’s important to install the line driver as close to the deck, or other source, as possible. We've had great success targeting systems with OEM decks using LOCs with relatively high output impedances. The N-645 placed just after the LOC can really convert the OEM deck into a competition quality deck.
This item is Special Order. Delivery Time ~ 14 days.
Available Right Here
Normally $169.95 - On Sale for $149.95