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  1. #1

    BAT REX II Mono Amps vs ML No536 Monoís

    So Iíve been running by BAT REX II Preamp and ML No536 amps for almost 5 years and have really enjoyed it! I finally got the itch however to try an all tube setup and when I found a great deal on a pair of BAT REX II Mono amps I took the dive! Tonight is my first night listening so these are my first impressions Ö

    The REX II amps are much more open sounding on every track I played regardless of type of music. A more holographic soundstage as well though the Levinsons perform well there also. Brushes are softer and more realistic sounding and the piano and Saxes are amazing on the all tube setup. The bottom end is definitely not as aggressive as the Levinsonís but itís not bad either. Iíd say that there is the impression that the Levinson amps will dissect the music and give the impression of more detail and they might be slightly more detailed although the REXís provide a more wholistic picture of the music which is just as satisfying if not maybe more real sounding. Still I have to say the Levinsonís do extract a bit more detail from some tracks. One area the Levinsons win hands down is in slam and dynamics but itís not really a fair comparison there Ö 160 watts on the REXís at the 4 ohm load of my Wilson Alexx vs the 800 Watt at 4 ohm rating of the No536. Chalk up the win there for the Levinsons. If I stay with the REXís Iíll likely upgrade to the newest version the REX III and give serious consideration to running 4 of them .. and yes I have dedicated AC for the room. So far the amps havenít warmed up the room at all. :-)

    It does take about a good hour for the BAT amps to really open up and sound great and I suspect that the power tubes are in need of replacement as the previous owner gave me an estimate of around 1800 hours on the 6c33ís so Iíll be ordering a new set of those shortly.

    Well Ö thatís about it for initial impressions. Iíll update over the weekend as I get more time with the amps and start leaning towards deciding which Iíll be keeping and which will move on for now.

    George
    Wilson Audio Alexx|Pair of Rel No25ís
    BAT Rex II Monoís|BAT Rex II Pre
    VPI Avenger Plus w/ Transfiguration Proteus/VTL TP6.5
    Esoteric D-02X|Esoteric P-02X|Aurender N100H
    MIT Oracle SC and IC
    Transparent Reference Power

  2. #2
    Senior Member
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    Re: BAT REX II Mono Amps vs ML No536 Monoís

    Can you bi-amp your wilson's using the MLs for the bass?
    Might be an interesting experiment.
    My System
    Acoustic Revive RTP-4
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    Lampizator BALTIC4
    Supratek Chardonnay
    Pass XA30.5 or
    Line Magnetic 845ia
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  3. #3

    Re: BAT REX II Mono Amps vs ML No536 Monoís

    No ... Wilson Audio doesn't make their speakers with the ability to bi-amp.

    George
    Wilson Audio Alexx|Pair of Rel No25ís
    BAT Rex II Monoís|BAT Rex II Pre
    VPI Avenger Plus w/ Transfiguration Proteus/VTL TP6.5
    Esoteric D-02X|Esoteric P-02X|Aurender N100H
    MIT Oracle SC and IC
    Transparent Reference Power

  4. #4
    Senior Member
    Join Date
    Nov 2013
    Location
    St. Louis, MO, USA
    Posts
    2,830

    Re: BAT REX II Mono Amps vs ML No536 Monoís

    Then what did you mean when you said, "you might run 4 of them", when referring to buying the other model of BAT amp?

    Thanks for the comparison.
    Quote Originally Posted by gadawg View Post
    No ... Wilson Audio doesn't make their speakers with the ability to bi-amp.

    George
    Aurender ACS10 w/Audioquest Diamond USB, Esoteric N05xd
    Mark Levinson #526, 534 & JBL 4367's
    Clear Audio Performance DC w/Maestro cart
    Clarus Concerto & their Crimson cables

    HT: Marantz AV8003, Linn 5125, JBL SAM3ha, Revel s30,
    SVS PC13 Ultra
    Transparent, Analysis Plus & Tributaries. PS Audio filtering
    Sony XBR-75X940D & BDP
    Parasound P6, MBL 8006b, Artisan speakers/subwoofer

  5. #5

    Re: BAT REX II Mono Amps vs ML No536 Monoís

    Quote Originally Posted by Mr Peabody View Post
    Then what did you mean when you said, "you might run 4 of them", when referring to buying the other model of BAT amp?

    Thanks for the comparison.
    With the BAT REX II amps in Mono configuration you can actually take two of the REX IIís and wire them in parallel to a single speaker basically bridging the output of the two amps into a single speaker terminal so that with 4 Ö 2 on each speaker you end up with 320 watts and twice the current but also twice the number of cables. Iíve never heard of any other amp doing that trick Ö in fact you can continue to string the amps together in parallel until you run out of power or AC! LOL

    That said Ö with them wired in parallel Iíve heard there is a small decrease in intricate detail but that the soundstage get much larger and the bass attack is substantially better with much better control of the speaker. Iím hoping that a fresh new set of tubes cures me of that desire! :-)

    Iím also trying to zero in on exactly how long the system needs to warm up before reaching optimum state. While Iíve had tubes in my preamps many times over the years all the way back to my Counterpoint SA-5000 back in the early 90ís, this is the first time Iíve actually owned tube amps so its an interesting journey. On a couple of tracks I am missing the dynamic and rock solid bass control of the Levinson amps Ö guess I didnít realize how good it was but on most of my music the tube magic is slowly drawing me into its dark spell Ö to be continued after new tubes arrive and are run in properly.

    George
    Wilson Audio Alexx|Pair of Rel No25ís
    BAT Rex II Monoís|BAT Rex II Pre
    VPI Avenger Plus w/ Transfiguration Proteus/VTL TP6.5
    Esoteric D-02X|Esoteric P-02X|Aurender N100H
    MIT Oracle SC and IC
    Transparent Reference Power

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