Vendor: DiamondBoxx
SKU: Model_XL3_300
Regular price $ 1,999.00 Sale price $ 1,999.00 Regular price $ 1,999.00
Aluminum Color Black Anodized
Battery Size 300Wh
In stock: 6

Loud Clear Wireless Sound Anywhere You Need It

The XL3 is a big, powerful, yet portable and wireless, battery powered speaker system.  It can play very loud with very deep bass, clear vocals and highs, on battery power for up to 26 hours on a single charge.

XL3 Stereo Expander Operational Description 


The King of all Bluetooth Boombox, the Model XL3.  But don't take our word for it, check out this review video by Flossy Carter. 

Wireless True Stereo Sound, with adjustable stereo width control.  Six electrically and mechanically hand matched 5.5" woofers and 4" bass port for bass you can feel as well as hear.  122dB loud.  Huge 300Wh lightweight Lithium battery.  Anywhere, anytime, no electricity needed.

5-26 hours of music on a single charge

Built-in 600 Watt RMS (1000W Max) Class A/B 10 channel high fidelity amplifier in a tri-amped or bi-amped arrangement (mode dependent) with 2-way or 3-way active crossovers and analog signal processing for the best sound possible in the lightest package with the longest battery life, and ZERO LATENCY inputs for video use. 

With its massive aluminum front panel serving as the amplifier's heatsink, it is made to play FULL BLAST all day on a hot day without skipping a beat. 

The Specifications 

Size- 28 x 19 x 12 inches 

Bluetooth- Bluetooth 5.1 aptX HD, TWS 

Woofers- 6 x 5.5 inch Aluminum Cone 

Tweeters- 4 x 1 inch Titanium Dome 

Amplifier Power- 600 Watts RMS , Max 1000W 

Frequency Response- 35Hz - 22kHz  @+/ -3dB 

Weight- 45 lbs. 

Internal Battery- Lithium Ion 300 Wh, protected

Max Voltage- 16.8V  

Battery Life- Over 1000 recharge cycles 

Charging time (0-100%)  about 4 hours w/ 16.8V 7A charger   


Included Items 

DiamondBoxx Model XL3 

7A Lithium-Ion Battery Charger 

3.5 mm stereo audio cable 

User manual 

Proudly Made in USA   


Please note that ALL new Model XL3 will have Bluetooth 5.x and will not connect via True Wireless Stereo (TWS) with older versions of the XL2 or other first or second generation DiamondBoxx products.  They can still be linked via cable.  


XL3 Owner's manual 

Free Shipping in Cont. US
Made Eco Friendly
Loud Clear Undistorted
Full Spectrum Stereo Sound


Customer Reviews

Based on 12 reviews
Andrew Brigham
Blew me away instantly

Diamondboxx is no contest when it comes to high end sound quality and performance. Just got my xl3 and wow the sound is unbelievable to be honest. You need to experience it first hand. I previously have the M3 and two of the pa15’s those are also great. But this xl3 has such deep bass and goes loud I need to get another one to pair them up. It sounds better than my high end setup and that it’s portable makes it the only choice for music inside and outside hands down. There is no other company that can even compete in this category. Clear crisp loud deep bass no distortion at any volume. Ive been a supporter since 2019 from Canada and if you keep making them I’ll keep buying them.

Andrew Brigham

Ian Bro
This speaker will change your life.

I am a huge fan of portable. Music rolls with me everywhere I go. Smaller speakers check the box for many of my needs, but I have been looking for an audio solution for inside my large, open floor plan home and large outdoor living areas. I am not the kind of guy that sits in only one place for my music enjoyment. A traditional home audio system is not for me. All of the other large bluetooth speakers I have tried wash out and lack true definition in the minds and highs. The XL3 covers the mid and highs in ways that remind me of my dad’s McIntosh tube amp system. There is so much warm definition in these speakers!! The ability to to fine tune the mids and highs is exactly what I have been looking for. AND these things LOVE to to be CRANKED UP. There is no doubt. This is the only speaker that I have ever found that will make you feel like you are at a live concert venue. It’s truly superlative. I have the sub 8.2 on order and can’t wait to get it.

Matthew Garman
Worth every penny. Don’t knock it till you try it.

I was highly skeptical due to the high price of the XL3, so i went ahead and bought it before I could change my mind about it and you WILL NOT be disappointed. Loud, deep bass punches everytime and crystal clear audio even at max volume (unlike 99% of other Bluetooth speakers) If I could could give it more than 5 stars I would and it’s safe to say my tax return will be invested in a second XL3 or XX4 😎😎

Looking forward to the Double x

I can't wait to get my double x Excited to see the 8 in speakers with the 6 inch speakers amazing technology advancements in the company

Alan Newman
Best speaker hands down

I'm looking forward to the Double X I can't wait these guys just keep going This will be the fifth diamond box I buy and there is no comparison to any other company out there They make the best stereo system in the world