SR400P - Loudspeaker ALTO - Free user manual and instructions
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| Product Type | Passive PA Loudspeaker |
| Brand | ALTO |
| Model | SR400P |
| Speaker Type | 2-way passive sound reinforcement speaker |
| Woofer | 15\" (380 mm) woofer with 2.5\" voice coil |
| Tweeter | 1\" (25 mm) aluminum diaphragm compression driver |
| Frequency Response | 45 Hz - 20 kHz |
| Sensitivity | 98 dB SPL (1W/1m) |
| Maximum SPL | 124 dB |
| Power Handling | 400 W program / 800 W peak |
| Impedance | 8 ohms |
| Dispersion | 90° horizontal x 50° vertical |
| Connectors | 2x Speakon NL4, 1x 1/4\" phone jack |
| Dimensions (HxWxD) | 650 x 430 x 420 mm (25.6\" x 16.9\" x 16.5\") |
| Weight | 18.2 kg (40.1 lbs) |
| Power Requirement | External amplifier, 8 ohm output |
| Enclosure | Plywood with black textured paint |
| Mounting | 35 mm pole socket for speaker stands |
| Maintenance | Wipe with dry cloth; avoid water and solvents |
| Safety | Use stable stands; secure speaker to prevent tipping |
| Spare Parts | Replaceable woofer, tweeter, and grille via service center |
Frequently Asked Questions - SR400P ALTO
Is the ALTO SR400P an active or passive speaker?
The SR400P is a passive loudspeaker, meaning it does not have a built-in amplifier. It requires an external power amplifier to operate.
What is the power rating of the SR400P?
The speaker handles 400 W program power and 800 W peak power at an impedance of 8 ohms. Match it with an amplifier that provides 400-800 W RMS per channel into 8 ohms.
What amplifier should I use with the SR400P?
Use a professional power amplifier rated about 400 W to 800 W per channel at 8 ohms. Avoid clipping to prevent driver damage.
Can I use the SR400P for outdoor events?
Yes, the SR400P is designed for PA and live sound applications. However, protect it from moisture and dust when used outdoors to avoid damage.
What are the dimensions and weight of the SR400P?
The speaker measures 650 x 430 x 420 mm (HxWxD) and weighs 18.2 kg, making it suitable for portable use.
How do I connect the SR400P to an amplifier?
Use Speakon or 1/4" jack cables from the amplifier's output to the speaker's input connector. Ensure the amplifier is off before connecting.
Can I mount the SR400P on a speaker stand?
Yes, the speaker has a 35 mm pole socket on the bottom, compatible with standard speaker stands. Always use a stable stand rated for at least the speaker's weight.
How should I clean and maintain the SR400P?
Wipe the enclosure with a dry soft cloth. Do not use water, liquids, or solvents, as they may damage the finish and speaker components.
What are the frequency response and coverage of the SR400P?
The frequency response is 45 Hz - 20 kHz, with a dispersion pattern of 90° horizontal by 50° vertical, providing wide coverage for audiences.
Are replacement parts available for the SR400P?
Yes, woofers, tweeters, grilles, and connectors are available through authorized ALTO service centers. Contact support for ordering and replacement procedures.
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USER MANUAL SR400P ALTO
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Product information
Brand : ALTO
Model : SR400P
Category : Loudspeaker