Connecting two amplifiers to a radio is a task faced by car owners who strive for powerful and balanced sound. One amplifier can be responsible for the front speakers and high frequencies, and the second for the subwoofer and low bass. However, an incorrect connection may result in audio distortion or even equipment failure. In this article, we will figure out how to correctly combine two amplifiers with a Android-radio is a challenge faced by car owners who strive for powerful and balanced sound. One amplifier can be responsible for the front speakers and high frequencies, and the second for the subwoofer and low bass. However, an incorrect connection can lead to overloading the power circuit, sound distortion or even equipment failure. In this article we will figure out how to correctly combine two amplifiers with Androidrecorder, avoiding typical mistakes.

The main difficulty is that most Androidrecorders (for example, Pioneer AVH-Z5200BT, JVC KW-M75BT or Xtrons PB7868AP) have a limited number of line outputs (usually 1-2 RCA pairs). This means that to connect two amplifiers you will need to either use Y-splittersor use an audio processor. In addition, it is important to consider wire cross-sectionfuse ratings and speaker impedance compatibility - we'll talk about this later.

Why might you need two amplifiers?

Using two amplifiers instead of one are justified in several cases:

  • 🔊 Separation of frequency ranges: one amplifier works with tweeters midbass (20 Hz - 5 kHz), the other - with a subwoofer (20-200 Hz). This reduces the load on each component and improves sound quality.
  • 🚗 Upgrading the existing one systems: if you already have a subwoofer amplifier installed, and the front speakers sound weak, a second amplifier will solve the problem without replacing all the equipment.
  • ⚡ Powering high-impedance speakers: Some amplifier models (for example, Alpine MRV-F300) are optimized to work with 4-ohm speakers, while others (for example, Rockford Fosgate R500X1D) cope better with 2-ohm subwoofers.

In addition, two amplifiers allow you to flexibly adjust crossover (frequency separation) and gain (signal level) for each range separately. For example, you can set a more aggressive bass for a subwoofer without affecting the mids and highs.

📊 Which amplifier are you planning to connect second?
For the subwoofer
For the front acoustics
For rear speakers
Not decided yet

What equipment will be needed?

Before starting work, prepare the following components:

Component Purpose Examples of models
Linear cables RCA Transmission of audio signal from the radio to amplifiers Stinger Pro Series, Kicker KISL
Y-splitter RCA Separation of one radio output to two amplifiers Scosche YAR10, PAC SNI-15
Power cable (0 AWG or 4 AWG) Power supply of amplifiers from battery KnuKonceptz Kolossus, Stinger Expert
Power distributor Branching +12V to two amplifier NVX XDIS2, SoundQubed SDC-2
Fuses (80A–120A) Circuit protection from short circuit ANL, Mini-ANL

Pay attention to power cable cross-section: for amplifiers with a total power of up to 1000 W enough 4 AWG, for systems more powerful 1500 W required 0 AWG. Also make sure that the radio supports output raw signal (raw signal) - some budget radio models (for example, Android-cassette player (for example, Atoto A6) can distort the sound at high volumes.

⚠️ Attention: If your radio does not have linear outputs RCAand only 3.5 mm or USB, you will need an additional DAC (digital-to-analog converter) or adapter. In this case, the connection diagram will have to be modified.

Connection diagrams for two amplifiers

There are three main ways to connect two amplifiers to one radio. The choice depends on the number of linear outputs on the head unit and the type of amplifiers.

1. Connection via a Y-splitter (for radios with 1 pair). RCA)

The simplest, but not always the best option. Suitable if both amplifiers will reproduce the same frequency range (for example, two monoblocks for subwoofers). Scheme:



[Radio] → RCA (left/right) → Y-splitter → [Amplifier 1] + [Amplifier 2]
  • ✅ Pros: minimal cost, easy installation.
  • ❌ Cons: loss of signal quality, cannot be divided frequencies.

2. Connection through a sound processor (for radios with 1-2 RCA pairs)

A more advanced method that allows you to separate the signal by frequency DSP processor (for example, JL Audio FiX 86 or AudioControl LC6i). Diagram:



[Radio] → RCA → [DSP processor] → RCA (output 1) → [Amplifier 1]


→ RCA (output 2) → [Amplifier 2]

Advantage: you can adjust crossover, time alignment the equalizer for each amplifier separately. Disadvantage is the high cost of the processor (from 15 000 ₽).

3. Connection via a radio with 3+ pairs. RCA

Ideal option if your radio (for example, Android- radio (for example, Sony XAV-AX8000 or Alpine iLX-F411) has three pairs of linear outputs Scheme:



[Radio] → RCA. (front) → [Amplifier 1]


→ RCA (rear) → [Amplifier 2]


→ RCA (sub) → [Amplifier 3] (optional)

In this case, each amplifier receives independent signal, which eliminates quality loss. However, such radios are much more expensive.

Make sure that the radio supports signal output to external amplifiers

Check the compatibility of the impedances of the speakers and amplifiers

Select cables with a current reserve (cross section +20% of the calculated one)

Disconnect the battery before installation

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Step-by-step guide for connecting

Consider a universal algorithm for connecting two amplifiers via Y-splitter (the most common scenario).

Step 1: Power off

Remove negative terminal from the battery to avoid a short circuit If the car has an alarm system. backup power, turn it off during work.

Step 2: Laying power cables

Lay main power cable (0 AWG or 4 AWG) from the battery to the installation site amplifiers. Recommended route:

  1. From the positive terminal of the battery through the engine compartment.
  2. Through the technological hole in the cabin (usually next to the gas pedal).
  3. Under the floor trim to the trunk or under the seats.

Secure the cable with plastic ties, avoiding kinks. Install fuse at a distance 15–30 cm from the battery.

Step 3: Connecting the power splitter

If you are using two amplifiers, connect power distributor (for example, NVX XDIS2) to the main cable. From the distributor, run separate cables (8 AWG) to each. amplifier. Do not forget about mass wires —their length should be minimal (it is better to attach it to the body next to the amplifier).

Step 4: Connecting the audio signal

Connect RCA cables from the radio to Y-splitter, and from it to the inputs of the amplifiers. If the amplifiers have control gain, set it to minimum before turning it on for the first time.

Step 5: Setting up the radio

In the menu Android-radio (for example, in Settings → Sound → Outputs) activate the option "Subwoofer Out" or "RCA Output". Make sure that the signal level does not exceed 5 V (for most amplifiers this is a safe threshold).

⚠️ Attention: If after connection appears whistling or crackling), check the grounding of the amplifiers. Often the problem is solved by reconnecting the ground wire to another body bolt. background noise (e.g. whistling or crackling), check the grounding of the amplifiers. Often the problem is solved by reconnecting the ground wire to another body bolt.
💡

To check the signal quality, use test tracks with pure sine waves (for example, Sweep 20–20kHz). This will help identify distortions at an early stage.

Typical mistakes and how to avoid them

Even experienced installers sometimes make mistakes that spoil the sound or damage the equipment. Here are the most common:

  • 🔌 Improper grounding: the ground wire is connected to a painted or rusty surface. Solution: strip the metal to a shine and use star grounding (all masses converge at one point).
  • 🔊 Current overload: the cable cross-section is not enough for the total power of the amplifiers. Solution: use a cable one size thicker than the manufacturer recommends.
  • 🎛️ Unbalanced gain: one amplifier operates at maximum, the other at minimum. Solution: adjust the signal levels using an oscilloscope or multimeter.
  • 🔋 No capacitor: when the system power exceeds 1000 W voltage sags are possible. Solution: install a capacitor with a capacitance 1–2 Farads next to the amplifiers.

Critical error: connecting amplifiers with different input impedances to one output of the radio through a Y-splitter. This leads to load imbalance and can damage the output stage of the head unit. If the amplifiers have different impedances (for example, 10k Ohm and 20k Ohm), use buffer amplifier (for example, AudioControl Overdrive).

Sound adjustment after connection

After mechanical connection, you need to adjust the sound parameters so that the system works smoothly.

1. Level balancing (Gain Matching)

Use a test one. tone (1 kHz) and a multimeter to measure the voltage at the outputs of the amplifiers. The goal is to achieve the same signal level (for example, 2 Vadjust in small steps to avoid clipping. gain small steps to avoid clipping.

2. Setting up crossovers

For the front amplifier, set high-pass filter to 80–100 Hzto remove the load of low frequencies. For the subwoofer amplifier, activate low-pass filter to 80–120 Hz. The overlap of the ranges should be minimal.

3. speakers

Check that all speakers are working in phase. To do this, apply a mono signal (50 Hz) and listen to the sound: if the bass is “blurry”, change the polarity on one of the speakers.

💡

Perfect sound tuning takes time. Use reference tracks (for example, "Hotel California" in FLAC format) to assess the frequency balance.

FAQ: Frequent questions

Is it possible to connect two amplifiers to a radio without RCA outputs?

Yes, but you will need linear output converter (LOC), which converts the signal from the radio speakers to RCAPopular models: AudioControl LC2i, PAC AOEM-GM24. Please note that the sound quality will be worse than with a direct connection.

Which fuse to choose for two amplifiers?

The fuse rating is calculated by the formula: (Total amplifier power / 13.8 V) × 1.2. For example, for the system 2000 W: (2000 / 13.8) × 1.2 ≈ 173 A. Select the nearest standard rating - 180 A (type ANL).

Will there be a difference in sound if you use a Y-splitter instead of a processor?

Yes. Y-splitter simply duplicates the signal, while DSP processor allows:

  • Divide frequencies among amplifiers (crossover).
  • Adjust the frequency response (EQ).
  • Eliminate sound delays (time alignment).

The difference is especially noticeable at mid and high frequencies.

Is it possible to connect amplifiers in parallel to one power cable?

Technically it is possible, but not recommendedParallel connection increases the risk of voltage sags and cable overheating. It is better to use power distributor with separate fuses for each amplifier.

Why did noise appear after connecting the second amplifier?

The reasons may be as follows:

  • Poor grounding (check the weight of the amplifiers).
  • Noise from power cables (lay RCA and power in different harnesses).
  • Poor quality Y-splitter (replace with a shielded model).
  • High level gain on amplifiers (reduce until clean audio). data-i="293">Why might you need two amplifiers?

Connecting two amplifiers to Android-radio is a task that requires attention to detail. Properly selected components, proper cable routing and precise sound tuning will allow you to achieve professional quality car audio. If you are not confident in your abilities, contact specialists - installation errors can cost more than the services of an installer.