Description
DS18 QHL4
The DS18 QHL4 is a 4‑channel lossless audio high‑to‑low level line output converter engineered to seamlessly integrate aftermarket amplifiers with both factory (OEM) and aftermarket head units by converting high‑level speaker signals into clean low‑level RCA preamp outputs without degrading sound quality. Featuring advanced lossless transformers with noise rejection and a built‑in speaker emulator, it preserves audio integrity while preventing system errors from modern head units that detect speaker load. The QHL4 supports selectable auto turn‑on via audio or DC trigger and includes a 12 V remote output to trigger amplifiers automatically. With adjustable level matching controls, LED power indicators, and a rugged aluminum housing, this converter delivers up to 2.5 V preamp output across a wide frequency response of 15 Hz–20 kHz with low distortion, making it ideal for cleanly bridging factory and custom audio systems.
Specifications
| Parameter | Specification |
|---|---|
| SKU | QHL4 |
| Maximum Speaker Level Input | 50 W (Low Power) / 100 W (High Power) |
| Maximum Preamp Output | 2.5 V |
| Nominal Conversion Ratio | 4:1 (Low Power) / 6.5:1 (High Power) |
| Frequency Response | 15 Hz – 20 kHz |
| Total Harmonic Distortion | 0.07% (1 kHz) |
| Input Impedance | 6 Ω (Speaker Emulator) |
| Output Impedance | 600 Ω |
Features
| Feature | Specification |
|---|---|
| Speaker Level Input | Yes, 4 Channels |
| Selectable Auto Turn-On | Yes, Audio (3 V) / DC (2.5 V) |
| Remote Output | Yes, 12 V DC, 100 mA max |
| Amplifier Outputs | 4 Channels RCA (FL/FR/RL/RR) |
| Level Matching Controls | Yes (Low Power / High Power) |
| LED Indicators | Yes, ON LED indicator |
| Housing Material / Color | Aluminum / Black |
| Wiring Connector | Single Molex |
| Noise Rejection | Transformers with Galvanic Insulation |
| Step-Down Method | High-Quality Lossless Transformers |
Measurements
| Dimension | Size |
|---|---|
| Overall Length | 3.9 in / 99 mm |
| Overall Width | 2.4 in / 61 mm |
| Overall Height | 1.1 in / 28 mm |
| Gross Single Unit Weight | 0.55 lb / 0.25 kg |
Product Overview
Upgrade your vehicle’s sound system with DS18’s QHL4. This compact line output converter is your key to unlocking superior audio quality and seamless integration.
Engineered for those who demand nothing but the best, this 4-channel line output converter delivers pure, unfiltered sound with seamless integration into any vehicle system, whether OEM or aftermarket. Advanced transformers and cutting-edge noise rejection technology ensure that your audio remains untouched by interference.
Installation is a breeze thanks to its compact, rugged design, complete with a detachable harness and straightforward labeling. Versatility is at its core, effortlessly handling both high-power (up to 100W) and low-power sources, making it the perfect companion for any setup. With built-in speaker simulation, the QHL4 guarantees flawless integration by ensuring your OEM source detects the original speaker load.
The QHL4 doesn’t just stop at superior sound—it’s smart too. The intelligent +12V remote output automatically triggers your amplifiers, with LED indicators for easy monitoring. And with its durable aluminum housing and tear-proof wiring connector, you can trust it’s built to last.
Disclaimer: Ensure your vehicle’s electrical system operates at 12V DC with a negative ground.
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