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Rachel bloat? (Read 584 times)
benlefebvre
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Rachel bloat?
07/25/18 at 03:05:44
 
Hey all,

Trying out a Rachael 34I.5 running it into a pair of Zu Omens. The amp sounds amazing except one issue - thereís a bit of bloat in the mid-bass. Iíve tried putting in a pair of 6922s into the input slots, and thatís taken the warmth back a tad, but things can still sound a bit mashed-potatoes. Overall, I like the ampís presentation a bit better than the Mini Torii I own - thereís a bit more punch - but where the MT can be lean, Rachael sounds too warm in that part of the audio spectrum. Any suggestions on how to tame that?
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Lon
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Re: Rachel bloat?
Reply #1 - 07/25/18 at 03:21:04
 
Well I'd try some different output tubes. . . and perhaps some 7DJ8 input tubes. Tubes will give you some interesting frequency range changes.
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mark58
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Re: Rachel bloat?
Reply #2 - 07/25/18 at 15:35:26
 
I think you'd get better answers if you told us your current tubes and associated gear. †I recently bought a Rachel and yes, it is much warmer with more Bass than my Monoblocks. †I tried some 807 power tubes but found them too warm with my Zu Audio Souls, I went back to my RFT EL-34s that I have always preferred in my Torii and they are a better match...more clarity in the bass and more detail all around. †My associated gear is a CSP3 and ZROCK II ...source is a Jolida 100 CD player or streaming from the laptop with a Red Dragonfly DAC in between it and the CSP3.

If I get around to moving my Omega Alinco speakers to try with the Rachael, I think the added warmth with the 807 tubes might be a better match. †Mark.

PS...also the gap you use on the bottom of your Omen's will change the sound as will speaker placement. †I don't do treatments so others will suggest that.

PSS...one other thing I did when I was having problems with boomy Bass when I added a sub to my primary system was to place the sub on an isolation platform and move the sub farther into the room so the wall wasn't affected as much. †The isolation worked so well to tighten and clarify the Bass, I bought two more for the HR-1 speakers. †I haven't felt the need to do so in the second system though...where the Rachel and Zu Audio "Souls' reside. †The link is the platform and company I bought them from...I recommend both.

https://www.sweetwater.com/store/detail/SubDudeII--auralex-subdude-ii?mrkgcl=28&...
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benlefebvre
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Re: Rachel bloat?
Reply #3 - 07/25/18 at 20:29:16
 
Thanks, Mark58. Iím using the stock tubes except for the Valvo 6922s I put in. I might try different EL-34s.  Otherwise, using a VPI Classic into a Tavish Vintage phono amp (trio of 6SL7s) and a Schitt Gungnir. At first I thought the phono amp might be mismatching with the Rachel, but streaming the exact same albums into the Gungnir offer the same bloat in the mid-bass. The 6922s definitely helped lift a veil on the higher frequencies, and alleviated the bloat somewhat, but still need to work on those basement frequencies.
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Archie
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Re: Rachel bloat?
Reply #4 - 07/26/18 at 01:13:12
 
Quote:
...one other thing I did when I was having problems with boomy Bass when I added a sub to my primary system was to place the sub on an isolation platform and move the sub farther into the room so the wall wasn't affected as much. †The isolation worked so well to tighten and clarify the Bass, I bought two more for the HR-1 speakers. †I haven't felt the need to do so in the second system though...where the Rachel and Zu Audio "Souls' reside. †The link is the platform and company I bought them from...I recommend both.


I'd like to second Mark's isolation suggestion. †It can't hurt and I bet it will make an order of magnitude difference compared with tube swapping.
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benlefebvre
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Re: Rachel bloat?
Reply #5 - 07/28/18 at 01:22:01
 
Actually, the tube swapping cleared things up wonderfully. I think the problem may be solved. Mark for the win on that one.
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Cuff
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Re: Rachel bloat?
Reply #6 - 09/21/18 at 20:55:08
 
Curious to know what tube set you ended up with to mitigate the issue. I'm going to be moving my Rachael into a system with a pair of Zu Omen Dirty Weekends, located in a room where the mid-bass frequencies are typically problematic due to a lot of wood, stone, and glass surfaces. It may not be a workable pairing since there's little I can do in terms of room treatment, but I do have a good variety of tubes I can try rolling.
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RPi/DigiOne/Volumio>Schiit Gungnir MB>Schiit Freya>Decware SE34I.5>Spatial Hologram M3 Turbo S & Rythmik F25 sub
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TimB
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Re: Rachel bloat?
Reply #7 - 09/22/18 at 03:20:42
 
Iím quite curious, too, as I have an SE34I on order that I plan to use with my Zu Omens.  Iíd like to know what tubes seemed to fix it.

Hopefully my room should only be helpful (Iím pretty giddy - Iím building a new one!), and maybe Iíll be ok with the stock tubes.
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MoFi StudioDeck, DL-103R, Lounge LCRMKIII & Copla, BorderPatrol SE DAC, Rogue Pharaoh, Zu Omens
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