L2P Manual

Safety Precautions, Warranty, and Disclaimer Improper soldering and handling of electricity can cause serious injury and damage to your property. Read and understand the instructions below before beginning your project. Follow the instructions, build carefully, and use the appropriate tools. Build at your own risk. DIY Recording Equipment, LLC is not responsible for any damage or injury resulting from the assembly or use of your LINE2AMP kit. You are the manufacturer of your LINE2AMP. It is your responsibility to turn this group of parts into a working piece of recording equipment. DIY Recording Equipment, LLC does not guarantee the success of your project and disclaims any Implied Warranty of Merchantability. Please visit the support forum for assembly support.
Damaged or Missing Parts All kits and parts are checked before being shipped to you. If something arrives damaged or if your kit is missing a part, please open a support ticket to inquire about a replacement. Missing parts will be replaced at our expense. Damaged parts should be returned for verification. If the part shows signs of use beyond what was necessary to determine that it was damaged, DIY Recording Equipment, LLC reserves the right not to replace the part.

Thank you for purchasing an L2P kit! Depending on your level of experience, you should be able to turn the pile of parts in front of you into a working piece of recording gear in about 30 minutes.

If this is your first DIY project ever, we recommend reading our Getting Started Guide before, well, getting started.

If you have any questions please don't hesitate to contact us for support.

Contents :

Assembling the L2P
    1. Gather Necessary Tools
    2. Idenfity Parts
    3. Sort and Bend Resistors
    4. Place Resistors
    5. Bend Resistors Against PCB
    6. Solder Resistors
    7. Place Input Jacks
    8. Solder Input Jacks
    9. Place & Solder XLR Jacks
    10. Place & Solder Switch
    11. Trim Excess Leads
    12. Slide Assembly into Case
    13. Screw on Panels
    14. Apply Foam Pad

Using the L2P

    Assembling the L2P

    1. Gather Necessary Tools

    To successfully build the L2P, you'll need the following tools:

    • Soldering iron (and solder)
    • Phillips head screw driver
    • Wire cutter

    If you don't have some of these tools, check out our Recommended Tools page.

    2. Idenfity Parts

    Take a moment to identify all the parts of the kit:

    • L2P Case
    • Foam Pad
    • L2P PCB
    • Front and back panels
    • Input 1/4" jacks (2x)
    • Output XLR jacks (2x)
    • Toggle switch
    • 2.7k resistors (6x)
    • 150 resistors (2x)
    • Screws (15x)
    3. Sort and Bend Resistors

    Idenfity the two 150R resistors and six 2.7k resistors. Bend their leads near the body before inserting them into the PCB.

    4. Place Resistors

    Place the resistors according to the values marked on the PCB.

    Notes: Since resistors don't have any polarity, it doesn't matter which way the leads are facing. And, since this resistor will not be letting off significant heat, you can place the body flush against the PCB.

    5. Bend Resistors Against PCB

    Before soldering, bend the resistor leads agains the bottom of the pcb.

    6. Solder Resistors

    Solder the resistor to the PCB. Here are a couple good soldering practices to observe:

    • Heat the pad and lead together for 2-3 seconds before applying solder
    • Apply just enough solder to cover the entirety of the pad, so that no gold is showing through
    • Leave the iron in place while you are adding solder and for 1-2 seconds after
    • The entire soldering process should take 5-8 seconds
    • Allow the solder joint to cool for about 20 seconds before soldering another lead of the same component
    7. Place Input Jacks

    Place the 1/4" input jacks in the areas labeled "J1 / INPUT 1" and "J2 / INPUT 2." To keep the jacks in place, bend the leads back with a small flat-head screwdriver as shown.

    8. Solder Input Jacks

    Solder the leads of the input jacks, leaving about 10 seconds between each joint.

    9. Place & Solder XLR Jacks

    Place the XLRs jack in the "J3 / OUTPUT 1" and "J4/ OUTPUT 2" positions on the PCB. Lay the jacks on their backs with the PCB lying on top of them to solder.

    Solder the three metal pins of the XLR jack. Don't solder the two plastic mounting pins.

    10. Place & Solder Switch

    Place the switch in the "DPDT" position, and bend the longer leads to keep it in place. Before soldering, attach the front panel via the input jacks' mounting nuts and washers.

    Once the front panel is mounted firmly, solder the switch to the PCB.

    11. Trim Excess Leads

    Trim away the excess pins and leads with a wire cutter. Cut each lead as close to the solder joint as possible, without compromising the joints themselves.

    12. Slide Assembly into Case

    Slide the assembled PCB into the lower channel in the chassis. The front panel should be on the side of the case nearest the "L" in "L2P."

    13. Screw on Panels

    Screw in the eight remaining mounting screws. Since these screws are cutting their own threads in the aluminum, you'll feel a healthy amount of resistance the first time you put them in.

    It's a good idea to install all four screws on one panel loosely before tightening each one.

    14. Apply Foam Pad

    Remove the backing and apply the neoprene foam to the bottom of the case.

    Complete!

    Congrats on completing your L2P!

    If you had any difficulties or suggestions for improving this guide, please drop us a line.

    Using the L2P

    Operation

    The L2P (Line to Preamp) is a two-channel, line-level, balanced attenuator. It has two primary applications in the studio:

    • Place it after colored mic preamps set on the -10 setting to drive the preamps harder without clipping converters
    • Place it between line outputs and and mic inputs on the -30 setting to add preamp color to tracks during mixing
    Input

    The L2P accepts two balanced inputs via 1/4" TRS jacks 1 and 2. The toggle switch sets both pads to either -10dB or -30dB.

    Output

    The padded signals exit the L2P via two 3-pin XLR jacks. You can patch the padded signal to any balanced piece of gear, including converters, mixing desks, mic preamps, and signal processors.