Alpine KTP-445U Amplifier Instruction Manual
Alpine KTP-445U Amplifier
Alpine KTP-445U Amplifier Instructions
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Alpine KTP-445U Amplifier Specifications
| Feature | Specification |
|---|---|
| Product Type | 4-channel power amplifier (Head Unit Power Pack) |
| Model | KTP-445U |
| Number of Channels | 4 (can be bridged to 2-channel output) |
| RMS Power Output | 45 W RMS x 4 at 4 Ω / 2 Ω, 14.4 V, <1% THD+N |
| Total Harmonic Distortion + Noise | <1% THD+N |
| Signal-to-Noise Ratio | 82 dBA (reference: 1 W into 4 Ω) |
| Amplifier Circuit | High efficiency digital circuit design with global modulation topology |
| Operating Voltage | 12 V DC, negative ground vehicles only |
| Fuse | 15 A x 1 |
| Recommended Inline Battery Fuse | 15 A (sold separately), as close as possible to battery (+) terminal |
| Minimum OEM Radio Circuit Fuse Rating | 15 A |
| Ignition Tap Fuse (optional connection) | 3 A |
| Input Types | RCA line-level inputs or speaker-level inputs |
| RCA Input Identification | FRONT = Violet sleeve, REAR = Grey sleeve |
| Input Configuration | 2-channel or 4-channel input mode (2CH default) |
| Input Signal Type Switch | RCA (default) / SPKR |
| High Pass Filter (Crossover) | Selectable front and rear: OFF (default), 60 Hz, 80 Hz, 120 Hz |
| Gain Control | Front and rear variable input gain |
| Remote Turn-On | Blue/White lead, positive trigger (+12 V only) |
| Remote Out | Blue/White lead, pass-through remote signal for additional amplifiers |
| Auto Turn-On | REMOTE SENSING function with speaker-level inputs |
| Battery Lead | Yellow |
| Ground Lead | Black |
| Speaker Output Wire Colors | Front Left: White, White/Black; Front Right: Grey, Grey/Black; Rear Left: Green, Green/Black; Rear Right: Violet, Violet/Black |
| Mounting Options | Mounting brackets with screws or cable ties through chassis mounting loops |
| Mounting Screws | Self-tapping screws M4 x 12 (x4) |
| Included Accessories | Mounting bracket x2, self-tapping screw (M4 x 12) x4, cable tie x2, input wire harness x1, output/power wire harness x1 |
| Minimum Distance from Car Harness | 10 cm (3-15/16") |
| FCC Compliance | Class B computing device, Subpart J of Part 15 of FCC Rules |
| Warranty | 1 year from date of first consumer purchase (U.S.A., Puerto Rico, Canada) |
| Origin | Designed in USA, Made in China |
Alpine KTP-445U Amplifier Details
The Alpine KTP-445U is a compact "Head Unit Power Pack" made to add real amplification to a factory or aftermarket head unit without a complicated installation. It is small enough to fit behind a dashboard or under a seat. It adds clean power to four speakers and offers several installation methods, so it works in many different vehicles.
Installation is flexible. Option A uses the included mounting brackets. You take the two bottom screws off each end panel, use them to fix the brackets, use the amplifier as a template to mark four holes, and secure it with self-tapping screws. Option B skips drilling. You pass cable ties through the mounting loops on the bottom panel and strap the unit to the vehicle frame or chassis.
The Input Signal Type switch lets the amplifier take either low-level RCA signals or speaker-level signals. With speaker-level inputs, you cut off the RCA jacks and wire the head unit's speaker outputs straight to the twisted-pair input wires. This makes the KTP-445U a good match for factory radios that have no preamp outputs.
When the amplifier is fed speaker-level signals, the REMOTE SENSING function detects the incoming audio and turns the amplifier on by itself, so you usually don't need a remote turn-on lead. Alpine notes that it may not work with every signal source. In that case, connect the remote lead to an accessory (ACC) power wire.
The Input Configuration switch picks 2-channel or 4-channel input. In 2CH mode, one stereo pair feeds all four outputs, which is useful when the head unit only has front outputs or when you run the amplifier in a bridged 2-channel output system. In that case, the manual requires the switch to be in the up position.
Gain setup follows a set procedure. Turn the amplifier gain to minimum, play a dynamic CD, and raise the head unit volume until the sound distorts, then back off one step. Next, raise the amplifier gain until distortion appears and reduce it slightly. With speaker-level inputs, Alpine recommends keeping both gain controls between minimum and the 9 o'clock position.
The manual includes a connection checklist for head units that lack a proper remote turn-on lead, whose power antenna lead only turns on in radio mode, or that use a 5 V logic or negative-trigger output. For these units, connect the remote lead to a switched ignition source protected by a 3 A fuse. An optional SPST switch lets the driver turn the amplifier off by hand, which prevents battery drain.
Noise prevention gets special attention. Ground the unit to a bare metal spot on the chassis and confirm continuity with the negative battery terminal. Ground all audio components to the same point to avoid ground loops, and keep power leads away from signal wiring. The Remote Out lead passes the turn-on signal to additional amplifiers for future expansion.
Frequently Asked Questions (FAQs)
Can't find the answer you need? Here are some frequently asked questions about the Alpine KTP-445U Amplifier, and we answer them below.