The speaker has outer signs of wear. 2 rubber stand covers are missing on the bottom. Partsitc was founded in 2011 and since then we've been focused on getting people around the world great deals on computer products, and hardware.
eBay
For Harman Kardon AURA STUDIO 4 Bluetooth speaker Desktop speaker 360 degree surround sound sinking subwoofer
Aliexpress UK
This is my unit purchased originally from John Lewis. It comes complete with the power lead, and a working remote control. Please note ….. There is no iPod included in the sale. It has hardly been used but unfortunately when I came to use it this time, it appears to have a fault with playing music with heavy bass and gives distortion. It plays fine with music with normal base. So I am listing it for parts or not working. Outwardly considering how old it is, it is in very good condition apart from two slight scratches next to the front facing right speaker. This is shown in one of the photographs. Any questions, please ask. 
eBay
Harman Kardon ONYX STUDIO6 Desktop stereo speaker Computer stereo portable Bluetooth speaker
Aliexpress UK
The speaker has outer signs of wear. Partsitc was founded in 2011 and since then we've been focused on getting people around the world great deals on computer products, and hardware. Choose from 1000's of parts to build, upgrade, or get your computer working exactly the way you want it.
eBay
FLY ANC Earpads For Harman Kardon FLY ANC Headphone Ear Pads Earcushion Replacement
Aliexpress UK
In the second image you can see the plastic is broken underneath the fabric which creates a dent on the speaker. However, it doesn't affect the sound in any noticeable way. Partsitc was founded in 2011 and since then we've been focused on getting people around the world great deals on computer products, and hardware.
eBay
2 Inch Full Range Speaker 4OHM 20W Neodymium Tweeter Mid Bass Loudspeaker Built-in Type For Harman Kardon High-end Audio 2pcs
Aliexpress UK
(For otherversions, USB is for Service only.). What’s in the boxHarman Kardon Go + Play 3Power cable Quick start guideSafety instruction and warranty card. hope you can understand!
eBay
1PC GHXAMP for Harman Kardon Passive TV Neodymium Ultra-thin Speaker Dual Radiation Clear Sound 390mm*250mm*16mm Mid-bass Diy
Aliexpress UK
With this adapter you can stream your Echo Dot speaker or Echo Input audio or audio from any Bluetooth device through your Harman Kardon Go + Play. Enjoy flexible Bluetooth wireless connectivity with your 30 pin Harman Kardon Go + Play Portable speaker dock.
eBay
GHXAMP For Harman Kardon Projector High end full range Passive Speaker 4ohm 20W +Dual bass diaphragm 2piece
Aliexpress UK
A very expensive docking station when new. Untested as it has now power lead or remote.
eBay
SOTAMIA Mini Speaker 1 Inch Silk Film Tweeter 2 Inch Full Range Speaker Long-stroke PP Basin Passive Audio for Harman Kardon
Aliexpress UK
For connectivity with your Harman Kardon Go + Play speaker.
eBay
for Harman/Kardon for Aura Studio3/4 Speaker Storage Base and Speaker Stand, Prevent the Speaker from Sliding and Vibrating
Aliexpress UK