would these speakers be loud enough for a dance party in my apartment?

We believe these speakers would be loud enough for your dance party. Whenever we get a new model in the office we often tend to crank up the speakers and have our own office parties.

Which version of Bluethooth these speaker use? 3.0? 4.0?

These speakers use Bluetooth 4.0.

do i need an amplifier to connect these to the tv and watch movies?

No need. You can connect directly to your TV. These have built-in amplifier and all cables are included.

Can I buy an extender for the 10 ft speaker cable or a longer speaker cable?

Personally, I wouldn't recommend these be placed >10' apart. For good stereo imaging, the separation and listening distance should comprise an equilateral triangle (or stretched one). Say speakers 8' apart so the cable isn't stretched! Then listen from 8' or maybe up to 15' away. If this doesn't give you enough volume you need more powerful amp/speaker system. Nearfield listening (say with 6' between speakers and listening from 6' away) can give you a sublime stereo listening experience.

Is Electric	Yes
Power Source	Wireless
Speaker Maximum Output Power	120 Watts
Subwoofer Connectivity Technology	Wired
Connectivity Protocol	Bluetooth
Wireless Technology	Bluetooth
Connectivity Technology	Bluetooth, Optical
Number Of Circuits	1
Audio Driver Type	Dynamic Driver
Item Weight	10400 Grams
Item Dimensions D x W x H	44.3"D x 29.2"W x 36.3"H
Unit Count	1 Count
Number of Audio Channels	2.0
Compatible Devices	Bluetooth
Speaker Size	5 Inches
Woofer Diameter	5 Inches
Tweeter Diameter	25 Millimeters
Specific Uses For Product	indoor entertainment
Controller Type	Remote Control
Color	Wood
Is Waterproof	False
Warranty Type	Limited
Control Method	Remote
Audio Output Mode	Stereo
Mounting Type	Shelf Mount/Tabletop Mount
Material Type	Wood
Speaker Type	Bookshelf
Additional Features	DSP, Optical
Recommended Uses For Product	For Surround Sound Systems

Edifier R2000DB Bluetooth5.0 2ウェイ ブックシェルフ型スピーカー -アクティブスピーカーアンプ内蔵 - ステレオニアフィールドモニタースピーカー 木製 光入力 RMS リモコン付き - ウッド

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Edifier R2000DB Bluetooth5.0 2ウェイブックシェルフ型スピーカー -アクティブスピーカーアンプ内蔵 - ステレオニアフィールドモニタースピーカー木製光入力 RMS リモコン付き - ウッド