Introduzione
Thank you for choosing the Polk Audio Vanishing Series 255c-RT In-Wall Center Channel Speaker. This manual provides essential information for the proper installation, operation, and maintenance of your new speakers. The 255c-RT speakers are designed to deliver high-quality audio with a discreet, in-wall installation, featuring Polk's patented Power Port design for enhanced bass and Dynamic Balance Polypropylene Cones for clear midrange clarity.

Davanti view of the Polk Audio 255c-RT In-Wall Center Channel Speaker, showcasing the tweeter and dual woofers.
Configurazione e installazione
Proper installation is crucial for optimal performance and safety. These speakers are designed for in-wall mounting and feature a simple one-cut, drop-in installation process with Perfect Fit templates.
Disimballaggio
Carefully remove the speakers from their packaging. Inspect for any signs of damage during transit. Retain all packaging materials for future transport or service needs.
Selezione della posizione
For a center channel speaker, ideal placement is typically directly above or below your television or projection screen, centered horizontally. Ensure there is sufficient space within the wall cavity and no obstructions like electrical wiring, plumbing, or studs.
Wall Preparation and Cutout
- Use the provided Perfect Fit template to mark the cutout area on your wall.
- Tagliare con attenzione l'apertura utilizzando uno strumento appropriato (ad esempio una sega per cartongesso).
- Ensure the cutout dimensions are approximately 7.5 inches (19.05 cm) in height and 13.06 inches (33.17 cm) in width.

Diagram illustrating the overall speaker dimensions and the required cutout dimensions for a perfect fit installation.
Cablaggio
Connect your speaker wires from your amplifier or receiver to the speaker terminals. Ensure correct polarity (+ to + and - to -) for optimal sound performance. The speaker features spring-loaded terminals for secure connections.

Posteriore view of the speaker, showing the internal components and wiring terminals for connection.
Montaggio
The 255c-RT utilizes a Rotating Cam system for secure, vibration-free installation. Once the speaker is placed into the cutout, tighten the mounting screws, which will engage the cams to grip the wall firmly.

Image highlighting the Rotating Cam system for simple and secure setup, along with other high-performance features.
Installazione della griglia
The speaker comes with a paintable Sheer-Grille™ that attaches magnetically. Align the grille with the speaker frame and it will snap into place. The ultra-small perforations ensure dynamic, unimpeded sound.
Istruzioni per l'uso
Once installed and connected, your Polk Audio 255c-RT speakers are ready for use. Ensure your amplifier or receiver is powered on and set to the correct input.
Regolazioni audio
The 255c-RT features a 1" Silk dome tweeter set in a 15-degree swivel housing, offering placement flexibility. Additionally, it includes a Reflective Room Compensation switch (Filter/Norm) which lowers tweeter levels to offset reflective surfaces, ensuring a balanced sound profile in various room environments.

Diagram showing the Dynamic Balance Mid/Woofers, 1" Silk dome tweeter with swivel, and the Reflective Room Compensation feature.
Regola il tuo amplifier's volume and tone controls to achieve your desired sound. For optimal performance, consider running an automatic room correction system if your receiver supports it.
Manutenzione
Your Polk Audio 255c-RT speakers require minimal maintenance to ensure long-lasting performance and appearance.
Pulizia
To clean the speaker grilles and frames, use a soft, dry cloth. If necessary, a slightly damp cloth can be used, but avoid excessive moisture. Do not use harsh chemicals or abrasive cleaners, as these can damage the finish or grille material.
Verniciatura della griglia (opzionale)
The Sheer-Grille™ can be painted to match your room decor. For best results, use a fine-mist spray paint and apply several thin coats. Ensure the paint does not clog the grille perforations, as this can affect sound quality. Allow the grille to dry completely before reattaching.
Risoluzione dei problemi
Se riscontri problemi con gli altoparlanti, fai riferimento ai seguenti passaggi comuni per la risoluzione dei problemi:
- Nessun suono:
- Controllare tutti i collegamenti dei cavi degli altoparlanti sia sull'altoparlante che sul amplificatore/ricevitore. Assicurarsi della corretta polarità.
- Verifica che il tuo ampil convertitore/ricevitore sia acceso e impostato sulla sorgente di ingresso corretta.
- Verificare che il volume sia alzato e non disattivato.
- Suono distorto:
- Ridurre il livello del volume sul tuo amplificatore/ricevitore. Sovraccaricare gli altoparlanti può causare distorsioni.
- Controllare i collegamenti dei cavi degli altoparlanti per verificare che non vi siano fili allentati o cortocircuiti.
- Assicurare il amplifier/receiver is not clipping (indicated by a harsh, distorted sound at high volumes).
- Scarsa risposta dei bassi:
- Verifica che il tuo amplifier/receiver's bass settings are appropriately adjusted.
- Ensure the speaker wires are connected with correct polarity. Incorrect polarity can cause bass cancellation.
- Check if the Reflective Room Compensation switch is set to 'Norm' if you desire full tweeter output, or adjust as needed for your room acoustics.
If these steps do not resolve the issue, please contact Polk Audio customer support.
Specifiche
| Caratteristica | Specificazione |
|---|---|
| Nome del modello | 255c-RT |
| Tipo di altoparlante | Canale centrale |
| Complemento di guida | (1) 1" Tweeter, (2) 5.25" Mid/Woofer |
| Risposta in frequenza | 50Hz - 25000Hz |
| Impedenza | 8 Ohm |
| Sensibilità | 90 dB |
| Dimensioni dell'altoparlante (A x L x P) | 9.3" x 14.8" x 3.8" (23.62 cm x 37.59 cm x 9.65 cm) |
| Cutout Dimensions (H x W) | 7.5" x 13.06" (19.05 cm x 33.17 cm) |
| Tipo di montaggio | Montaggio a parete |
| Colore | Bianco (griglia verniciabile) |
| Potenza massima in uscita | 150 Watt |
| Tecnologia di connettività | Powerline (Wired) |
| Codice UPC | 783214557538 |
Garanzia e supporto
Informazioni sulla garanzia
Your Polk Audio 255c-RT speaker comes with a Full Warranty. Please refer to the warranty card included with your product or visit the official Polk Audio websito per termini e condizioni dettagliati riguardanti copertura, durata e procedure di richiesta di risarcimento.
Assistenza clienti
For technical assistance, troubleshooting beyond this manual, or warranty inquiries, please contact Polk Audio customer support. You can find contact information, including phone numbers and online support resources, on the official Polk Audio webposto (www.polkaudio.com).