What is the input port of this speaker? Does it have an optical input?

No optical input. There are 5 input ports, 2 RCA (L and R stereo) and 3 3.5mm marked as 6 channel.

What does B grade in the product title mean?

I'm not too familiar with grading, but I would imagine it means that there's a scratch on it somewhere. I don't think a scratch is going to make any difference in the quality of sound you receive from the speakers though, and the scratch would most likely be on the sub woofers box, which is normally hidden under or inside your PC desk....

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Logitech Recertified 980-000430 Z506 75 Watts RMS 5.1 Surround Sound Speakers (Scratch and Dent)

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5.1 Speaker System with 75 Watts RMS
Surround sound with 3D Stereo
Ported, down firing subwoofer
Scratch & Dent (may contain minor cosmetic flaws)

Overview

Specs

Reviews (10)

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Multiple InputsMultiple inputs let you connect your PC, game console, iPod, DVD player, and more.
Surround Sound with 3D StereoThe Logitech Z506 speakers convert two-channel stereo into an immersive surround sound experience. And you’ll hear rich, balanced sound all around you - in every corner of the room and everywhere in between.
75 Watts (RMS) of Power75-watt RMS power fills your room with sound—and even rattles a few windows.
Ported, Down-firing SubwooferThe subwoofer delivers deep bass that brings your music, movies, and games to life.
Dedicated Bass ControlYou’re in command—dial the bass up or down for as much (or little) boom as you want.

Model
Brand	Logitech
Model	Z506
Part Number	980-000430

Details
Configuration	5.1
Total Power	75 Watts
Satellite RMS Power /ea	8 Watts front, 16 Watts center, 8 Watts rear
Subwoofer RMS Power	27 Watts
Frequency Response	45Hz - 20KHz

Dimensions & Weight
Weight	11.24 lbs.

Features
Features	Multiple inputs: You've got the flexibility to set up your system the way you want to. Connect your PC, PS3, Xbox 360, Wii, iPod, DVD player, and more. Surround sound with 3D Stereo: You'll hear it all around you - even from two - channel sources. Your speakers convert two-channel stereo into an immersive surround sound experience. Ported, down-firing subwoofer: Deep bass brings your music, movies, and games to life. Dedicated bass control: You’re in command - dial the bass up or down to for as much (or little) boom as you want. Total peak power: 150 Watts Cables Front: 2 meters Rear: 5 meters Center: 2.7 meters Accessory cables: 2 meters

Additional Information
First Listed on Newegg	February 17, 2016

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Limited Warranty period (parts): 90 days
Limited Warranty period (labor): 90 days
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Return Policies

Return for refund within: 30 days

Return for replacement within: 30 days

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Logitech Recertified 980-000430 Z506 75 Watts RMS 5.1 Surround Sound Speakers (Scratch and Dent)

Refurbished

Learn more about the Logitech Z506

Customer Reviews of the Logitech Z506

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info

Item#: N82E16836121195

Logitech Recertified 980-000430 Z506 75 Watts RMS 5.1 Surround Sound Speakers (Scratch and Dent)

Refurbished

Learn more about the Logitech Z506

Customer Reviews of the Logitech Z506

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info