Connecting two Alto TS112A speakers with a subwoofer is a practical way to build a powerful and balanced live sound or DJ setup. Whether the system is being used for small events, band rehearsals, worship services, or mobile DJ gigs, properly wiring the components ensures clean audio, strong bass response, and protection for the equipment. While the process is straightforward, understanding signal flow and cable selection makes a significant difference in performance and reliability.
TLDR: To connect two Alto TS112A speakers with a subwoofer, route the audio signal from your mixer to the subwoofer first, then send the high-passed outputs from the sub to each TS112A speaker. Use balanced XLR cables whenever possible for noise-free performance. Adjust crossover settings and levels carefully to achieve a balanced mix. Proper placement and gain staging are just as important as cable connections.
Understanding the Equipment
The Alto TS112A is a powered (active) 12-inch two-way speaker. Because it has a built-in amplifier, it does not require an external power amp. Each speaker accepts line-level inputs through XLR or 1/4-inch combo connectors and provides a mix output for daisy chaining.
A powered subwoofer works similarly. It typically includes:
- Line-level inputs (XLR/TRS)
- High-pass outputs (often labeled “Thru,” “Output,” or “High Pass Out”)
- Crossover controls
- Level control
The key principle is simple: the subwoofer should handle low frequencies, while the TS112A speakers handle mids and highs. This is accomplished using the subwoofer’s built-in crossover.
What You Will Need
Before beginning, the following items should be on hand:
- 2x Alto TS112A powered speakers
- 1x Powered subwoofer
- 1x Audio mixer or sound source
- 3x XLR cables (minimum)
- Power cables for each speaker and subwoofer
Balanced XLR cables are strongly recommended because they reduce noise and interference, especially in live environments.
Basic Signal Flow Explained
The cleanest and most effective connection method follows this signal path:
- Mixer Main Output → Subwoofer Input
- Subwoofer High-Pass Outputs → Each TS112A Speaker
This configuration ensures that the sub handles bass frequencies while sending mid and high frequencies to the main speakers.
Step-by-Step Connection Guide
Step 1: Turn Everything Off
Before connecting any cables, ensure that all equipment is powered off. This prevents pops, electrical damage, or sudden signal spikes.
Step 2: Connect the Mixer to the Subwoofer
Using an XLR cable, connect the left main output of the mixer to the left input of the subwoofer. If the subwoofer has stereo inputs, also connect the right output accordingly.
If the subwoofer only has a mono input, consult the manual. Some subs sum left and right channels internally.
Step 3: Connect the Subwoofer to the TS112A Speakers
Run an XLR cable from the subwoofer’s High Pass Out (Left) to the left TS112A speaker. Then connect another cable from the subwoofer’s High Pass Out (Right) to the right TS112A.
This routing ensures that deep bass is removed from the signal sent to the tops, allowing them to perform more efficiently.
Step 4: Power On in the Correct Order
Power sequencing matters:
- Turn on the mixer first
- Then turn on the subwoofer
- Finally, power on the TS112A speakers
This reduces unwanted pops or transient noises.
Setting the Crossover
The crossover determines which frequencies the subwoofer handles and which are sent to the main speakers.
For most setups with the Alto TS112A:
- Set the crossover between 80Hz and 120Hz
- Start at 100Hz if unsure
A lower crossover (around 80Hz) gives tighter, more focused bass. A higher crossover (100–120Hz) may increase perceived punch but can cause overlap if not balanced properly.
Gain Staging and Level Balancing
Proper gain staging ensures clean audio without distortion.
Recommended Process:
- Set individual channel gains on the mixer first
- Adjust master output to unity (0 dB)
- Set the subwoofer level knob to about 12 o’clock
- Adjust the TS112A input levels gradually
Once music is playing, fine-tune the subwoofer level to blend naturally. The bass should feel full but not overpowering.
Speaker Placement Tips
Correct placement enhances sound quality dramatically.
Subwoofer Placement
- Place on the ground (never elevated)
- Center between the two main speakers if possible
- Keep near a wall for enhanced low-frequency reinforcement
TS112A Placement
- Mount on speaker stands
- Position slightly above head level
- Angle inward slightly toward the audience
Alternative Connection Method (Without Sub High-Pass Outputs)
If the subwoofer does not provide high-pass outputs, the setup changes slightly:
- Mixer Main Outputs → Subwoofer
- Mixer Control Room Outputs (or secondary outputs) → TS112A speakers
However, without crossover filtering, the TS112A speakers may still receive low frequencies. In that case, external crossovers or DSP processors may be necessary for optimal performance.
Common Mistakes to Avoid
- Running full-range signal to tops and sub simultaneously without crossover control
- Using unbalanced cables in long runs
- Turning speakers on before the mixer
- Setting sub level too high resulting in muddy sound
- Ignoring room acoustics
Taking time to adjust crossover and levels prevents most audio quality problems.
Troubleshooting Guide
No Sound from Subwoofer
- Check XLR cable connections
- Ensure sub is powered on
- Confirm mixer output levels
Weak Bass Response
- Increase sub level gradually
- Lower crossover frequency slightly
- Check phase switch (if available)
Distorted Audio
- Reduce mixer output
- Lower speaker input sensitivity
- Verify gain staging
Do You Need a DSP or External Crossover?
In most small to mid-sized setups, a powered subwoofer with built-in crossover is sufficient. However, professional touring setups often include:
- Digital signal processors (DSP)
- Dedicated system controllers
- Time alignment adjustments
For everyday use with two Alto TS112As and a quality powered sub, built-in filtering is usually enough.
Benefits of Using a Subwoofer with TS112A Speakers
- Cleaner mids and highs from the TS112A
- More headroom in the top speakers
- Stronger low-frequency impact
- Better overall system balance
Removing low-frequency stress from the TS112A increases clarity and longevity.
Final Thoughts
Connecting two Alto TS112A speakers with a subwoofer is neither complicated nor time-consuming, but attention to detail makes all the difference. By routing the mixer output to the subwoofer first, leveraging high-pass outputs, setting an appropriate crossover, and carefully balancing levels, users can achieve professional-quality sound. Proper cable selection, thoughtful speaker placement, and good gain staging habits ensure consistent, powerful performance in virtually any live environment.
Frequently Asked Questions (FAQ)
1. Can the Alto TS112A be connected directly to a subwoofer without a mixer?
Yes, if the audio source provides line-level output. However, a mixer offers better control over levels, EQ, and multiple sources.
2. Should the subwoofer be placed in the center or on the side?
Center placement usually produces more even bass distribution. For small events, either can work, but center placement is generally recommended.
3. What crossover frequency is best?
Between 80Hz and 120Hz works well. Starting at 100Hz is a safe and balanced choice for most applications.
4. Can I daisy chain one TS112A to the other instead of using the sub outputs?
Yes, but only if no high-pass output is available. Using the subwoofer’s high-pass outputs is preferable because it protects the tops from unnecessary low-frequency content.
5. How many subwoofers should be used for two TS112A speakers?
One sub is sufficient for small to medium venues. For larger spaces or bass-heavy music, two subs provide better coverage and output.
6. Do balanced cables really matter?
Absolutely. Balanced XLR cables significantly reduce noise and interference, especially with longer cable runs.
7. Is a powered subwoofer better than a passive one?
For most users, yes. Powered subwoofers simplify setup because they contain built-in amplification and crossover controls.
