Rhumba Extreme 1.2 is on the way - Page 2
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  1. #11
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    Re: Rhumba Extreme 1.2 is on the way

    Agreed, impatience and snap judgements are not your friend in this hobby and can cost you a lot of money.
    Main - JVC QL-Y7/Denon Dl-301 Mk II, Gold Note PH-10, Nuprime CDT-8, Auralic Aries G1, Aqua La Voce S3, Kinki Studio EX-M1 , Verity Otello, (2) Rythmik F12SE, Dueland IC's, Triode Wire Labs SC & PC's, Equi=Core 1800, PI Audio Uberbuss, Timbernation rack

    Family Room - Oppo UDP-203, Teac NT-505, Wyred 4 Sound STP-SE, Mivera PurePower, Spatial M3TM, (2) Rythmik F-12G, Audio Sensibility SC & IC's, Neotech PC's, SurgeX SA-1810

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  3. #12
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    Re: Rhumba Extreme 1.2 is on the way

    Quote Originally Posted by Mechnutt View Post
    Some tube rolling may fix some of those issues. Do you know if it has teflon caps? They take 500 hours of burn in. When I replaced the worn out Jensen PIO caps in my BAT, it took 150 hours to get back to sounding great like it did. I thought I ruined the preamp at first. Then one day around 150 hours turned it on and the first few notes played and I started smiling because it was like someone flipped a switch and changed the sound.
    Yes, they are teflon V-Caps. Andy did say they ran it in on the bench while doing the mods/upgrades and I shouldn't expect a whole lot more improvement, but it's good to know that your experience has yielded even better results with further burn in.
    PRIMARY 2 CH SYSTEM: Backert Labs Rhumba Extreme 1.2 preamp (upgraded to 1.3); Luxman MQ-88uSE amp; Innuos Zen MK III; Chord Hugo M Scaler; Chord Qutest; Klipsch La Scala II; JL Audio e112; WireWorld ethernet, USB, BNC, interconnects
    OFFICE 2 CH SYSTEM: Rogue Audio Cronus Magnum II w/Clifte 12AU7 preamp tube; Luxman DA-06 DAC; Klipsch Heresy III, SVS SB2000; Auralic Aries
    HOME THEATER: Samsung Q6 82"; Anthem AVM 60; Monoprice Monolith 7; Monitor Audio Gold 200 L/R (5th Gen); Monitor Audio Studio surrounds; Monitor Audio Gold C200; Klipsch RP-140 SA Atmos; SVS SB-16Ultra; SVS SB-2000; Panasonic UB-820; Apple TV 4K
    LUXMAN EYECANDY COLLECTION: Luxman CL-40 Valve Preamp; Luxman C1010 preamp; Luxman M2000; Luxman L-509X

  4. #13
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    Re: Rhumba Extreme 1.2 is on the way

    After a full day of tweaking and experimenting I can say I am very happy with the Rhumba Extreme!

    To recap & follow up on what was done after initial setup, where bass appeared to be restrained...

    I am now plugging the Qutest directly into the REC OUT, which bypasses Inputs 1-4, since the Qutest is my only source. It did help with cleaning up a bit of the softness and restoring some snap and detail to the sound.

    After initial setup on the glass top of the BDI Corridor I learned that glass tops were not recommended for placement. The BLRE went on a wooden shelf in the cabinet and the bass did focus a bit more and overall sound was cleaner and smoother. HOWEVER, because I have my Orbi satellite and Hue Bridge close to that shelf, I noticed some motorboating (digital cycling noise) in the background. So I stole my wife's cutting board and using IsoAcoustic Oreas I replaced the BLRE on the top of the cabinet. This did result in a massive improvement in the overall sound.

    I also eliminated the high level speaker wire connection from the MQ-88uSE to the eSub and went directly from the OUT 2 of the preamp into the sub. This restored a great deal of balance to the bottom end. I also did some further experimenting with the crossover and phase settings of the eSub, moving the crossover from 70 down to 60. Resulted in a much better blend with the La Scala IIs and eliminated some directionality I hadn't noticed before.

    All of these tweaks got me to the point where I no longer felt the need to swap the L509X back in to compare - currently I have solid, well-controlled bass with presence and heft, better transients and cleaner background. This combined with the strengths of the BLRE over the 509X I already mentioned (massive soundstage with pinpoint placement accuracy, well-defined space around the notes, more musical unspooling of the music/greater liquidity) have me in a happy place where I am pretty confident I'll be able to let the 509X go to a new home, and explore further gains through tube rolling with the Rhumba Extreme.

    Fit and finish of the Rhumba Extreme is top-notch. It's not an exceptionally heavy unit, but it is a solid, attractive, exquisitely machined piece. The toggles are satisfying to flip around and the remote is a heavy piece of jewelry - the best remote I've ever owned from any component. I'm really glad I was able to restore placement on the top of the cabinet with the wood cutting board because this is not a component you want to hide away in a cabinet.

    The final piece of the puzzle was the delivery of a new Hugo M Scaler late in the afternoon. Although not related to the Rhumba Extreme, the gains are jaw-dropping when feeding the Qutest dual BNC inputs at full resolution. Suddenly all boundaries between the listener and the music disappear. It's like a portal has opened to the soundstage; it's almost unreal how much of an improvement it makes. It does, on some recordings - particularly with male vocals - add a bit of thinness to the sound I've experienced when upsampling from Roon in the past. But I chalk that up to the limitations of the Qutest more than anything else, and I can definitely see a DAVE upgrade in the next year.

    A note about the M Scaler and Rhumba Extreme - I should clarify that I'm not intending to project the gains of the M Scaler to the Rhumba Extreme. When putting the M Scaler in bypass mode, listening to the non-upscaled audio through the system is still remarkably transparent, engaging, and dynamic.

    All-in-all this is very close to end-game for me. In fact if it wasn't for the tiniest bit of thinness in male vocals when upscaling to the Qutest, I'd probably not even think about further upgrading to the DAVE, but knowing me, I'll always be nagged that there's "one last step" to achieve. I'm excited about doing some tube rolling with the Rhumba Extreme, but now we're talking the last 1% of gains in this system. At the budget level of most of these components (around $5K each between pre, amp, digital front end, etc) I cannot see experimenting with $3000 power cables or the like. Maybe down the road I end up swapping out the La Scala IIs for Volti Aluras, but for me this is definitely a good place to hit the pause button on the gear sickness and start enjoying music for a while!

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    PRIMARY 2 CH SYSTEM: Backert Labs Rhumba Extreme 1.2 preamp (upgraded to 1.3); Luxman MQ-88uSE amp; Innuos Zen MK III; Chord Hugo M Scaler; Chord Qutest; Klipsch La Scala II; JL Audio e112; WireWorld ethernet, USB, BNC, interconnects
    OFFICE 2 CH SYSTEM: Rogue Audio Cronus Magnum II w/Clifte 12AU7 preamp tube; Luxman DA-06 DAC; Klipsch Heresy III, SVS SB2000; Auralic Aries
    HOME THEATER: Samsung Q6 82"; Anthem AVM 60; Monoprice Monolith 7; Monitor Audio Gold 200 L/R (5th Gen); Monitor Audio Studio surrounds; Monitor Audio Gold C200; Klipsch RP-140 SA Atmos; SVS SB-16Ultra; SVS SB-2000; Panasonic UB-820; Apple TV 4K
    LUXMAN EYECANDY COLLECTION: Luxman CL-40 Valve Preamp; Luxman C1010 preamp; Luxman M2000; Luxman L-509X

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  6. #14
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    Re: Rhumba Extreme 1.2 is on the way

    Quote Originally Posted by Mechnutt View Post
    Some tube rolling may fix some of those issues. Do you know if it has teflon caps? They take 500 hours of burn in. When I replaced the worn out Jensen PIO caps in my BAT, it took 150 hours to get back to sounding great like it did. I thought I ruined the preamp at first. Then one day around 150 hours turned it on and the first few notes played and I started smiling because it was like someone flipped a switch and changed the sound.
    Curious as to how you knew your Jensen PIO caps were worn out. What was the failure mechanism?
    Technics SP-10MKII table in custom plinth with custom power supply made by Peter Noerbaek of PBN, SME 312s arm, SME 3012R arn, Dynavector XV-1s cartridge, Lyra Etna SL cartridge, ARC Ref 3 1.2 phono stage, Otari MX-55 2 track R2R, Ampex 350 tape repros, Roon Nucleus Plus music server, PS Audio DSJ DAC, ARC Ref 6, ARC Ref 75 with KT-150s, JBL 4345 speakers, Viero Equilibro Level 3 speaker cables, pair of Definitive Technology Ref subs.

  7. #15
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    Re: Rhumba Extreme 1.2 is on the way

    Quote Originally Posted by mep View Post
    Curious as to how you knew your Jensen PIO caps were worn out. What was the failure mechanism?
    I had a popping sound when turning on or off the BAT coming through the speakers (I can't remember which one). Also, changing any input caused a loud pop. I called BAT and spoke with Vicktor Khomenko himself about the issue. He stated that it was due to cap failure in the 6 pack of caps and that they should all be replaced. Apparently, when my VK51se was built, the caps had a high failure rate over time and that my issue was one they regularly saw. He offered to replace the caps for labor only which was $900. I bought the caps direct from Jensen and had my EE friend do it for free. All 12 needed to be to be replaced. Never had a pop since.
    .
    My Gear- Mains System-Pass X250 amp, BAT VK-51se preamp, Luxman DA-06 DAC, Magnepan 1.6's, Thorens TD-145 TT, Dual Martin Logan Subs, Vintage Luxman T-110 Tuner, Other systems- Parasound A21 amp,Van Alstine Ultra Plus Hybrid tube DAC and Preamp, Magnepan MMG's, Monitor Audio S1's, PSB B6's, Def Tech Pro Monitor 1000's, Velodyne sub, Adcom GFR-700 AVR, Music Hall 25.2 modified CDP, Cables by Cardas Parsec, AQ Columbia DBS 72v, Wire World.

  8. #16
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    Re: Rhumba Extreme 1.2 is on the way

    Quote Originally Posted by Mechnutt View Post
    I had a popping sound when turning on or off the BAT coming through the speakers (I can't remember which one). Also, changing any input caused a loud pop. I called BAT and spoke with Vicktor Khomenko himself about the issue. He stated that it was due to cap failure in the 6 pack of caps and that they should all be replaced. Apparently, when my VK51se was built, the caps had a high failure rate over time and that my issue was one they regularly saw. He offered to replace the caps for labor only which was $900. I bought the caps direct from Jensen and had my EE friend do it for free. All 12 needed to be to be replaced. Never had a pop since.
    .
    Thanks for your response. You usually worry about power supply electrolytic caps going bad over time and not film caps.
    Technics SP-10MKII table in custom plinth with custom power supply made by Peter Noerbaek of PBN, SME 312s arm, SME 3012R arn, Dynavector XV-1s cartridge, Lyra Etna SL cartridge, ARC Ref 3 1.2 phono stage, Otari MX-55 2 track R2R, Ampex 350 tape repros, Roon Nucleus Plus music server, PS Audio DSJ DAC, ARC Ref 6, ARC Ref 75 with KT-150s, JBL 4345 speakers, Viero Equilibro Level 3 speaker cables, pair of Definitive Technology Ref subs.

  9. #17
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    Re: Rhumba Extreme 1.2 is on the way

    ...
    Linn Kilmax LP12 | Channel D Lino C | innous ZENMini | Kii Three

 

 
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