1. Introduction
The Lowell ES-4T is a 4-inch dual cone in-ceiling speaker designed for commercial audio applications. It delivers clear intelligibility for speech and a full-frequency response for music. Its wide dispersion characteristics can optimize coverage in distributed speaker systems, potentially reducing the total number of speakers required.
2. Key Features
- Driver: 4-inch dual cone driver with a high-frequency whizzer cone for extended range.
- Transformer: Integrated 16W transformer with selectable taps for 25V, 70V, or 100V speaker systems. Includes an 8-ohm transformer bypass position. Tap selection is accessible behind the grille.
- Enclosure: Painted (grey) steel back-can with mounting dogs. The ported enclosure is tuned for enhanced low-frequency response.
- Grille: Press-fit grille with scrim for aesthetic integration and a pull-tool for easy removal.
- Mounting Aids: Includes support rails, a C-ring, a template, and a paint guard for simplified installation.
- Connections: Features a removable 4-pin Phoenix-style connector with two terminals for speaker input and two parallel terminals for output to the next speaker in a daisy-chain configuration.
3. Setup and Installation
Proper installation is crucial for optimal performance and safety. Ensure all local electrical codes are followed. It is recommended that installation be performed by a qualified professional.
3.1 Unpacking and Inspection
Carefully unpack the speaker and all accessories. Inspect for any signs of damage during shipping. Contact your supplier immediately if any damage is found.
3.2 Mounting Preparation
- Select Location: Choose a suitable ceiling location free from obstructions and structural elements.
- Cutout: Use the provided template to mark the ceiling cutout. Carefully cut the opening.
- Install Mounting Aids: Insert the support rails and C-ring through the cutout. Secure them according to the specific installation requirements of your ceiling type. The paint guard can be used to protect the speaker during ceiling painting.
Image 3.1: Included mounting aids, including support rails and a C-ring, designed to facilitate secure installation in various ceiling types.
3.3 Wiring Connections
- Access Connections: Remove the grille using the provided pull-tool to access the transformer tap selector and the Phoenix-style connector.
- Select Transformer Tap: Based on your audio system's voltage (25V, 70V, or 100V) or if using an 8-ohm bypass, adjust the rotary switch located behind the grille to the desired setting.
- Connect Wiring: Connect your audio amplifier's output wiring to the input terminals of the removable 4-pin Phoenix-style connector. If daisy-chaining multiple speakers, use the parallel output terminals to connect to the next speaker. Ensure correct polarity.
Image 3.2: View of the Lowell ES-4T speaker with the grille removed, revealing the dual cone driver and the rotary switch for selecting transformer taps (25V, 70V, 100V, or 8-ohm bypass).
Image 3.3: Rear view of the Lowell ES-4T speaker, showing the grey steel back-can, mounting dogs, and the removable Phoenix-style connector for audio input and output.
3.4 Final Placement
Once wiring is complete and verified, carefully insert the speaker into the ceiling cutout. Engage the mounting dogs by tightening the screws, which will secure the speaker firmly to the ceiling. Re-attach the grille by pressing it into place until it sits flush with the ceiling surface.
Image 3.4: Front view of the Lowell ES-4T 4-inch dual cone ceiling speaker with its white press-fit grille installed, ready for use.
4. Operating Instructions
The Lowell ES-4T speaker is designed for passive operation, meaning it requires an external amplifier. Once properly installed and connected to an appropriate amplifier, operation is straightforward:
- Power On: Turn on your audio amplifier.
- Audio Source: Ensure your audio source (e.g., mixer, media player) is active and sending a signal to the amplifier.
- Volume Control: Adjust the volume level using your amplifier or audio system's controls. Avoid excessively high volumes that could cause distortion or damage to the speaker.
- Transformer Tap Verification: If sound is too low or absent, double-check the transformer tap setting behind the grille to ensure it matches your amplifier's output voltage (25V, 70V, 100V) or is set to 8-ohm bypass for low impedance systems.
5. Maintenance
The Lowell ES-4T speaker requires minimal maintenance to ensure long-term performance.
- Cleaning: Periodically wipe the grille and visible surfaces with a soft, dry cloth. For stubborn dirt, a slightly damp cloth can be used, but ensure no moisture enters the speaker components. Do not use harsh chemicals or abrasive cleaners.
- Connection Check: Occasionally inspect the wiring connections to ensure they remain secure. Loose connections can lead to intermittent sound or reduced audio quality.
- Environmental Conditions: Ensure the speaker is not exposed to extreme temperatures, high humidity, or direct water contact, as these can damage internal components.
6. Troubleshooting
If you encounter issues with your Lowell ES-4T speaker, refer to the following common troubleshooting steps:
| Problem | Possible Cause | Solution |
|---|---|---|
| No sound from speaker |
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| Distorted or unclear sound |
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| Intermittent sound |
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If the problem persists after attempting these solutions, contact Lowell customer support or a qualified audio technician.
7. Specifications
| Feature | Detail |
|---|---|
| Driver | 4-inch dual cone, 25W |
| Transformer | 16W (taps for 25V, 70V, 100V, and 8-ohm bypass) |
| Overall Depth | 6.22 inches (15.8 cm) |
| Overall Diameter | 8.27 inches (21.0 cm) |
| Color | White (grille) |
| Nominal Impedance | 8 ohms (7.3 ohms minimum at 342Hz) |
| Conical Dispersion Angle | 175 degrees conical at 2kHz octave (-6dB) |
| Sensitivity (half space) | 85.7 dB (SPL at 1W/1M average) |
| Item Weight | 8 pounds (3.63 kg) |
| Product Dimensions | 6.22"D x 8.27"W x 8.27"H |
| Mounting Type | Ceiling Mount |
| UPC | 811859033312 |
| Manufacturer | Lowell Manufacturing |
8. Warranty and Support
For specific warranty information regarding your Lowell ES-4T speaker, please refer to the documentation included with your purchase or visit the official Lowell Manufacturing website. Warranty terms typically cover defects in materials and workmanship for a specified period from the date of purchase.
For technical support, service, or further inquiries, please contact Lowell Manufacturing directly through their official channels. When contacting support, please have your product model number (ES-4T) and purchase details readily available.
Lowell Manufacturing Official Website: www.lowellmfg.com
