Precise large soundstage, smooth, detail, tube. Best value for money, ends the competition. Ultra high quality sound.

Nothing really at this price point. A fantastic amp.

By far one of the best three car amplifiers ever tried. Butler Blue loves rock but it handles gently every kind of music - really a perfect choice. Smoothness, mid-range lush (needed for rock and voices), super-dynamic and very large and precise soundstage are the charisma of this amp. Worth every cent. Combine it with focal speakers and fast cables and you will not believe the overall quality.

Smooth, high sound quaility. It has been very reliable (over 7 years and going strong)

It does have a littel RF noise, but can not say for sure it is the amp and not a problem somewhere else. Not a cheap amp, but worth it.

I have the original TubeDriver, and it is awesome. I'm using it to power Dynaudio speakers and it is an incredible combo. I would also try the Diamond Audio Hex speakers (I prefer the silk tweeters) with this amp. This is for audiophiles. When this finally dies, I'll get the TubeDriver Blue.

I currently have 4 Butler amps in 2 cars each has Butler Tube line drivers converting to XLR cables. Pure awesome sound can overheat if over driven but hard to do. The harder you push them the better they sound. Can be driven down to 1 ohm and stable. easy to set up with out an EQ. no muss no fuss just loads of power

Need to warm up a few minutes. No crossover or any of the new high teck crap if thats what you like bells and whistles. had occasional problems with conections (solder) loosening.

Greatest sound I have ever heard in car audio. They love to be driven hard. sound good at low volume. has tube enhancement control and enable you to tune easily. for high, mids, or subs. If you like horns like myself you can't find a better amp.

Similar Products Used:

Nachs, HK, Macintosh, Zapco, Sound Stream, Phillips, Dimond, Quartz, Boston Acusics...

Perhaps the most natural sounding mobil amp. Great transparency and incredible detail. Warmth, Smoooooooothness

can only take 4 ohms stereo. NO X-over Availability, High cost

This amp is the best sounding amp I cam across. It is extreamly musical.It produces produces life like sound. Awesome transparency and musical detail. Throws a very large sound stage with good musical separation. Highly recomended!!!!!!!!

Similar Products Used:

ppi pc series,phoenix gold,mcintosh,Sony mobil es,Alpine, Kicker Zr,RF, Us acoustics, IMHO Butler TD sounds better than all the above

This amps reproduce musical instrument precisely and accurately. The soundstaging is very very good, I never heard any car amplifier that can reproduce the soundstage that produced by this amp. The Blue illumination is really beautiful...(That's why they called it BLUE!)

No crossover or any other stuff... this amp is a pure power. This amp require to warm up around 15 minutes to show the real muscle (Tube characteristic) these two are just very minor weakness, considering the sound that produce by this amp.

This review is actually for the 475 model, but it should have the same characteristic with 2150. The amp produce a clean warmth musical sound. This amp also has a very huge soundstage. I think this amp is a better than McIntosh amps, but McIntosh has more power and sound a little bit bright.

Similar Products Used:

Nakamichi, MB Quart, McIntosh, Focal, Alpine, Pioneer, JL audio, Eclipse, IXOS cables, Diamond audio, Phoenix Gold, Brax, Helix precission.

warmth and depth that regular amps cant produce

i guess its a little big but well worth it

Quite possibly the best sound quality amp ever made. it is worth the money

Similar Products Used:

ppi, rockford, ect