L.O.C.PRO LP5-2 - Hi-Fi System PAC - Free user manual and instructions

Product Type	Line Output Converter
Brand	PAC
Model	L.O.C.PRO LP5-2
Input Type	Speaker level (up to 4 channels via harness)
Output Type	RCA level (2 channels stereo)
Number of Channels	2 (stereo) input, 2 output
Gain Adjustment	Precision stereo gain dials for level matching
Differential Inputs	Yes, for OEM BOSE and premium systems
Dimensions	2.5 x 4.5 x 1.5 inches (approx)
Weight	0.3 lb (approx)
Power Supply	Passive (no external power required)
Material	Plastic housing with metal connectors
Color	Black
Mounting	In-line, can be mounted with zip ties (not included)
Applications	OEM radio replacement and aftermarket amplifier integration
Maintenance	None required; keep dry and clean
Safety	No specific warnings; follow standard car audio installation practices
Spare Parts	Not available; device is non-serviceable
Warranty	1 year (typical, check with PAC)
Certifications	Not specified

Frequently Asked Questions - L.O.C.PRO LP5-2 PAC

What is the L.O.C.PRO LP5-2 used for?

The L.O.C.PRO LP5-2 is a line output converter used to match audio levels between an OEM radio and aftermarket amplifiers. It can also retain factory amplifiers when replacing the radio.

How do I connect speaker level inputs?

Use the speaker wires from the source unit. Connect them to the harness wires (typically white/gray pairs). The RCA inputs on the harness can be cut off and saved for future use. Follow the wiring diagram in the manual.

Can I use it with a factory amplifier?

Yes, use the Speaker Level Input to Speaker Level Output configuration. Connect the RCA ends from the harness to the LP5-2 outputs to provide wired speaker level outputs for the factory amp.

How do I adjust the gain?

Use the precision stereo gain dials on the LP5-2. For accurate adjustment, use a digital multimeter and test tracks (1kHz for mid/high, 100Hz for sub) to set the output voltage to match your amplifier's max line-level input rating.

What does 'differential inputs' mean?

Differential inputs allow the LP5-2 to reject noise and ground loops, making it compatible with OEM premium systems like BOSE that may have balanced or floating ground signals.

Do I need external power?

No, the LP5-2 is a passive device and does not require an external power source. It draws signal power from the speaker-level inputs.

What is the output voltage range?

The output voltage depends on the input level and gain setting. It can typically range from 0 to 8V RMS, but you should set it to match your amplifier's input specification (e.g., 2V, 4V, or 8V).

Can I use it with a subwoofer?

Yes, use the LP5-2 to provide RCA outputs for a subwoofer amplifier. Connect the speaker outputs of your head unit to the LP5-2 inputs, then adjust gain using a 100Hz test tone for subwoofer applications.

How do I set the gain using a multimeter?

Set source volume to 3/4 max. Play a 1kHz (or 100Hz for sub) test tone. Set multimeter to AC volts. Probe negative on RCA shield and positive in center. Adjust LP5-2 gain until voltage equals the amplifier's max input voltage (e.g., 4V).

Is the device compatible with BOSE systems?

Yes, the LP5-2 has differential inputs specifically designed for OEM BOSE and other premium systems. This allows proper level matching and noise rejection.

USER MANUAL L.O.C.PRO LP5-2 PAC

Replacing your radio? PAC also produces RadioPRO ^™ which is a radio replacement solution, with steering wheel control retention built-in. This greatly expedites the installation of a new radio into your vehicle.

To see if there is a RadioPRO™ interface for your vehicle, visit www.pac-audio.com and search "Radio PRO".

Install It Right with L.O.C. PRO™

Don't cheat yourself out of all the performance your new radio or amplifier can deliver. Proper audio line level matching is critical when replacing your vehicle's factory (OEM) radio or amplifier. It can be the difference between a great sounding system that you enjoy every day and a buggy, noisy mess that drives you crazy. PAC L.O.C.PRO™ interfaces have been professionally designed for those who want the very best.

General Overview

The L.O.C.PRO™ LP5-2 can be used in either replacing an OEM radio and retaining the factory amplified system or adding amplifiers to a system that does not have RCA outputs. Level matching is achieved using precision stereo gain dials and will enable proper adjustment of audio output of the radio for optimum system performance. Differential inputs also allow for use in OEM BOSE and other premium system scenarios. Included in these instructions are the most common applications for the L.O.C.PRO™ LP5-2. For specialty applications not covered in this manual, please visit www.pac-audio.com for more comprehensive, vehicle specific wiring diagrams. Direct url - www.pac-audio.com/products/locpro

Speaker Level Input to RCA Level Output

Speaker level input to RCA level output is the most commonly used configuration for the LP5-2.

Use this when you need to create RCA level outputs from a source that only has speaker level outputs.

The RCA input connectors on the main harness will not be utilized for this type of installation, we suggest cutting them off the harness 3 inches from the RCA end so they can be saved and used for a future installation. After all the connections are made on the remaining wires, skip to the level adjustment section of this manual.

Cut away RCA ends for wired speaker level inputs

Note: If using large RCA connectors that are difficult to insert into housing, unsnap the L.O.C.PRO™ cover and remove end panel insert around RCA outputs.

Speaker Level Input to Speaker Level Output

Speaker level input to speaker level output is most commonly used when replacing an OEM radio and retaining the factory installed amplifiers. Use this when you need to match levels from a source that only has speaker level outputs and an amplifier with speaker level inputs. The RCA input connectors on the main harness will be used for this type of installation, we suggest cutting them off the harness 3 inches from the RCA end so they can be used for wired speaker level output. After all the connections are made, skip to the level adjustment section of this manual.

Cut RCA in half from main harness. Then connect to outputs of L.O.C to provide wired speaker lead outputs.

graph LR
    A["Front Left Audio Input"] --> B["Audio Ground Input (OPTIONAL)"]
    C["Front Right Audio Input"] --> D["Audio Ground Input (OPTIONAL)"]
    B --> E["3""]
    D --> E
    E --> F["Output"]
    style A fill:#f9f,stroke:#333
    style C fill:#f9f,stroke:#333
    style E fill:#ccf,stroke:#333
    style F fill:#cff,stroke:#333

Level Adjustment

New School –

Required items: Digital Multi-Meter, Test track media @ 1kHz and 100Hz. Max Amplifier Line-level Input Voltage Specification (i.e., 4vrms, 8vrms, etc.) Proper level adjustment is crucial for obtaining the best possible sound quality. Following the guidelines below will enable you to properly set the output gain of the LP5-2 using equipment that is readily available. Although this device can be set by ear (Old School), we recommend using a multi-meter and test tracks for pinpoint accuracy and the least chance of noise.

Amplifiers usually have 2, 4 or 8v max line-level input ratings but this can vary.

This max line-level input will be your target setting you will read on the multi-meter.

Example:

Amplifier 1 (Mid/High frequency) has a maximum 4v input voltage, so you will be targeting a 4 volt output voltage from the LP5-2.

or

Amplifier 1 (Sub frequency) has a maximum 2v input voltage, so you will be targeting a 2 volt output voltage from the LP5-2.

1. Start with gain adjustment levels on LP5-2 and amplifiers set to minimum.
2. Turn source unit to 34 maximum volume and start test track (1kHz for mid/high or full range, 100Hz for sub).
3. Choose either left or right channel - With multi-meter, test output of LP5-2. Probe with negative on RCA shield and positive in center of RCA output. (figure 1)
4. Slowly adjust level on LP5-2 until you reach the target voltage of the amplifier. (figure 2)
5. Turn volume down and system off.
6. Connect RCAs, set gains on amplifiers to minimum
7. Turn system on and fine tune gains of amplifier (if needed).

Old School –

1. Start with gain adjustment levels on LP5-2 and amplifiers set to minimum.
2. Turn source unit to 34 maximum volume and play a familiar song that has dynamic attributes. For example, if your volume goes to 40 you will turn it up to 30 and play a song that has some quiet sections and some really loud sections.
3. Slowly adjust front channel gain of LP5-2 until just a hint of distortion is audible, and then back down gain just under that threshold and the distortion goes away. (figure 2)

Figure 2

Pacific Accessory Corporation

Santa Ana, CA 92705

[e-mail] • www.pac-audio.com

Copyright 2013 Pacific Accessory Corporation. Content subject to change without notice.