BT4180 - 180 Watts RMS X 4

(7 reviews) Write a Review
5.00 LBS
BT4180 - 180 Watts RMS X 4
The Titan Quatro is our specialized four-channel amplifier. Designed to be plug-n-play with your Harley-Davidson, so installation is a snap! Rated up to 2-ohms stable, this is a serious piece of audio technology. Pushes 180 watts per channel (at 4-ohms), this amplifier will be audible under all driving conditions. Fan cooling with automatic gain rollback prevents thermal shutdown. And as always, it comes with our famous Lifetime Warranty, because it's the right thing to do. 

Technical Specifications

Description Hi-Tech High-Efficiency Switching Amplifier
Channels Four-Channel
Impedance Rating 2-ohm stable
RMS per Channel
(at 4 ohm)
180 Watts x 4
Total RMS
(at 4 ohm)
720 Watts
Peak Output per Channel
(at 4 ohm)
360 Watts
Peak Total Output
(at 4 ohm)
1,440 Watts
Total Harmonic Distortion 0.05% THD
Speaker Setup
  • 2 ohm: 4 speakers
  • 4 ohm: up to 8 speakers in parallel
Bike Fitment
  • Stock Radio: 2006 to 2013. May have to relocate any add-on HD modules.
  • Aftermarket Radio: 1996 to 2013
  • RoadGlide: With stock or aftermarket radio 1998-2013
Dimensions 7"x5"x1.8"
Manufactured Designed and manufactured in USA
StatorGuard Technology Includes specialized StatorGuard technology to protect charging system
Warranty Limited Lifetime Warranty



  • 5
    Great amp

    Posted by R.T. DICKSON on 18th Aug 2018

    Best amp for Hd

  • 5
    Great amp!

    Posted by ROOT76 on 16th Apr 2018

    You can just feel the quality in this amp right out of the box. It was easy to install in my motorcycle and it out performs all the other amps I've tried.

  • 5

    Posted by Paar on 26th Oct 2014

    I started with the retro fit and 6.5 Titan II on my 2012 SG. It sounded a lot better than stock. A few months later I added the 4180 and mounted the pod speakers to the king tour pack and wow what a difference. The clarity is unbelievable!! You can crank the hell out of the volume to the point of it being unbearable before you get any kind of distortion. The entire system is perfect and easy to install.

  • 5
    I can hear the music now!

    Posted by Ed P on 6th May 2013

    I recently installed the BT4180 amp and the BT7P1 speakers. They were easy to install and sound is unbelievable! The guys at Iron Cross installed front & rear outputs on the back of my head unit which also helped. Not only do I hear the music at 70mph I also hear every note, and the clarity blew me away. I went on a poker run and was taken requests from the guys riding behind me. The only down side was that it’s a tight fit under the fairing on my Ultra Classic. I had to relocate my iPod module and CB module to the underside of the radio. Just one last thing, the guys at Biketronics were very helpfully, and the stuff is made right here in the U.S.A. a big plus.

  • 5

    Posted by Troy on 3rd Dec 2012

    This amp is so powerful it gave me a headache after about 30 minutes riding with it less than half-way. Matter of fact, I stopped at red light next to someone in vehicle talking on the cellphone. The music was so loud that they put their windows up but it didn't help. They then proceeded to put their vehicle in reverse nearly backing into the vehicle behind them. All in an failed attempt to escape "the music coming from a bike". Another thing, the music is crisp and clean even at higher volumes. Awesome Amp!

  • 5
    Top line BT4180 Amp

    Posted by Ron P on 24th Nov 2012

    Just thought i would let others know about the BT4180 and how great and a easy install it was. I have tried other amps and as usual something was missing in all levels of the sound performance. I won't say what other amps i have tried, but with the BT4180 i cant believe there is a better amp for the money. The wiring install was so easy and no knobs to have to ajust for the gains made it a breeze to hook up.Now my speakers (Biketronics) perform better than before.I would HIGHLY recommend it for price and quality.

  • 5
    Awesome Amp!

    Posted by Kelly on 24th Sep 2012

    Damn this thing rocks! Going down the highway (60-80 plus) the boom amp would have to be at 3/4 plus for volume with the AVC set at 2 bars. Couldn't go any higher without distortion. This Biketronics amp about makes your ears bleed at 1/2 volume! I had to turn the AVC down to 1 bar.
    One of the things I was looking for was changing to a 4 channel amp and flashing the HK head unit so I could have fader control between the uppers and lowers on my SESG. This feature works awesome. I've always wanted to be able to bump the lowers a bit to even out the sound. The lowers seem to produce more base than the uppers. Must have to do with the enclosures and the opening sizes. I also put a few small strips of Fatmat behind each speaker. I'm using the same Biketronics (Hertz) Titan 6.5" uppers with 5 1/4 to 6.5 adapter ring, and lowers. Because of the quality and power of this system I was actually able to boost the base some and feel it working through my highway pegs!
    In short, you guys and gals can do your own technical research, but from what I've read and heard out there nothing comes close to this new amp. Great job Biketronics.