Quick answer
If your factory system already sounds decent and you just need a clean signal for an aftermarket amp, a line out converter like the Wavtech Link2 or AudioControl LC7i is a cost-effective choice. If you need to correct factory EQ, time alignment, or phase issues, a DSP-based LOC like the Kicker 47KEYLOC gives you more control.
What a line out converter does
A line out converter (LOC) takes the high-level speaker output from your factory stereo and converts it to a low-level RCA signal that an aftermarket amplifier can use. Basic LOCs are passive and simply drop voltage, while active LOCs include circuitry to handle higher input voltages and sometimes add features like signal summing or remote turn-on.
What a DSP adds to the equation
A digital signal processor (DSP) goes beyond conversion by letting you adjust crossover points, time alignment, equalization, and phase. Some modern LOCs, like the Kicker 47KEYLOC, integrate DSP tuning directly into the converter, automatically detecting and correcting factory frequency response and phase issues. This can dramatically improve sound quality without needing a separate DSP unit.
Trade-offs to consider
A basic LOC is simpler and cheaper, but it cannot fix factory EQ roll-offs or time alignment problems. An active LOC with AccuBASS, like the AudioControl LC5i or LC7i, can restore bass that factory systems often cut, but still lacks full DSP control. A DSP-based LOC offers the most correction, but costs more and requires more setup time. For many factory systems, a DSP LOC is worth the extra investment if you care about soundstage and flat frequency response.
Key trade-offs at a glance
- Cost vs. capability: Basic LOCs (Wavtech Link2) are affordable but offer no signal correction. Active LOCs (AudioControl LC5i, LC7i) add bass restoration and higher input handling. DSP LOCs (Kicker 47KEYLOC) provide full auto-correction but cost more.
- Ease of installation: Basic and active LOCs are straightforward to wire. DSP LOCs require a tuning step (even if automatic), which adds time but can yield better results.
- System complexity: If your factory system has aggressive EQ or phase shifts, a DSP LOC is often the only way to get clean, balanced sound. If your system is relatively flat, a standard LOC is sufficient.
Product facts
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AudioControl LC5i Pro 5 Channel Active Line Out Converter AccuBASS with ACR-1: Four channels of active speaker-level inputs with up to 40V input handling and AccuBASS bass restoration. The high input voltage handling makes it suitable for modern factory systems with powerful amps, and AccuBASS restores bass that many OEM head units roll off.
AudioControl LC5i Pro 5 Channel Active Line Out Converter AccuBASS with ACR-1
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AudioControl LC7i 6 Channel Line Out Converter with Accubass & Subwoofer Control: Six channel active line converter with AccuBASS to fix weak factory bass response. With six channels, it can handle a full factory system (front, rear, sub) and restore bass without needing a separate DSP, making it a versatile upgrade for most vehicles.
AudioControl LC7i 6 Channel Line Out Converter with Accubass & Subwoofer Control
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Kicker 47KEYLOC Smart 2 Channel Line Output Converter with Automotive DSP Tuning: DSP-controlled LOC that automatically detects frequency response and phase of the factory system, then allows integration. This auto-tuning capability solves common factory EQ and phase problems without manual DSP programming, ideal for users who want improved sound without complex setup.
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Wavtech Link2 2 Channel LOC Line Output Converter OEM Load Detect Compatible: High-quality 2-channel LOC, extremely small size, no additional features like summing or auxiliary inputs. Its compact size fits tight spaces, and the lack of extra features keeps the cost low, making it a great entry-level option if you only need a clean signal for a simple 2-channel amp.
Which one fits you?
Best for
- Drivers who want a simple, affordable signal conversion for a 2-channel amp (Wavtech Link2)
- Drivers who need bass restoration and more channels without full DSP (AudioControl LC5i or LC7i)
- Drivers who want automatic correction of factory EQ and phase issues (Kicker 47KEYLOC)
Not for
- Those who need full manual DSP control with time alignment and custom EQ curves (consider a standalone DSP instead)
- Budget builds where a passive LOC is all that is needed (a DSP LOC adds unnecessary cost)
