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  • Keces Audio S125 power amp – almost a giant killer

Keces Audio S125 power amp – almost a giant killer

February 20, 2018 10 Comments Written by BAL KAULSAY

KECES Audio S125 power amplifier


+ Excellent bass, near-neutral sound that kicks harder than its rated power output of 125 watts.
– Could be a little more transparent, and could use a polarity switch.
Sound: 9/10
Value: 10/10


THE Keces Audio S125 is compact, measuring about 10 inches deep, a foot wide and six inches high, and weighing about 10kg. Clad in 4mm thick aluminium, this stereo power amp doles out tremendous power for its rated 125 watts per channel. It has RCA and balanced inputs and a pair of five-way speaker binding posts, all of which are gold-plated and of immaculate quality.

There are are toggle switches for RCA/balanced in, and single amp or bridged mode. The S125 comes wrapped in double-boxed cardboard and strong foam plastic on the inside, with a supplied with a power cord. Tuck it under your arm and off you go…

SETTING UP
I plonked it in place of my current power amp, a Bryston 6B SST, connected the speaker cables, RCA inputs and power cord (my own, I did not use the supplied one as I already knew the sound signature of my own power cord), turned on the amp and left it to burn in for about 10 days. It sounded very good right out of the box. Burn-in extended the bass, improved the soundstage height, width and depth, as well as extended the treble slightly.

LISTENING
Listening was done in a room roughly 14 feet by 17 feet, with the Magneplanar MG1.7 speakers about eight feet in front of the listening chair. The S125 was the lowest priced component here; however, in no way did it embarrass itself in this company. And it drove the notoriously power-hungry Maggies with ease and grace. It produced full, deep, detailed and tuneful bass that gave the Bryston a bit of a run for its money.

Could it replicate the Bryston in my system driving the Maggies? No. But the Bryston is rated at 350W per channel. What the Keces could do with its rated output, however, was incredible. This may be the first review on the Internet of this amp driving a pair of 1.7s and the results were very satisfying.

At the tail end of my few weeks of listening to S125, I did manage to clip it and induce shut-down protection to kick in on one channel, but this was at a pretty insane volume of Queen’s Another One Bites The Dust… a volume that caused the infamous “mylar slap” thwack-thwack sound (the sound of the Mylar film of the speaker slapping against the back-metal frame; this happens when you drive Magneplanar speakers to some stupid high volume. Please don’t do this.). The amp resumed playing fine once it had cooled down and volume returned to sensible levels.

Listening to Tears for Fears’ The Seeds Of Love was very satisfying. This album has fantastic production, with incredible detail and layering of instruments and vocals. There is a lot going on here. Tracks like Woman In Chains, Bad Man’s Song and Sowing The Seeds Of Love contain a lot of emotion, the music swings and rocks and moves you to heights of joy, but only if your equipment does not induce harshness or over-exuberance in the treble, and if your power amp can keep up with the dynamic range. The S125 made listening to this a wonderful experience as it did have the clean power on tap to deliver.

Siri’s Svale Band’s Necessary So album is deeply complex both in its musical phrasing and production, with different timing signature than most other music. There is plenty of detail, space, and textures within the recoding. All this as well as deep acoustic bass and natural human voice were delivered very well by the S125.

The magnificent bass delivery of the S125 has been mentioned. The mids and highs are equally of excellent quality. Height of imaging as well as soundstage width was stunningly good. Depth was reasonably good. The amp never sounded harsh, nor brash even when the volume was turned up. Some constrain and the hard quality of clipping was heard at ridiculously ear bleeding volume just before it shut down, presumably to protect itself as well as my hearing.

Although the S125 delivers a lot of detail, where it can do a little better, methinks, is in transparency. While it is certainly not veiled, and perhaps because it is in company here amongst components that will show up reduction of transparency as well as the nth degree of inner detail in the recording, this is the one area I felt stopped this amp from being the giant-killer that it almost is. While almost all the detail is there, the last little upper treble detail could be better. The err here is in omission, which is always kinder and preferred to the err of commission. It is, otherwise, extremely neutral almost without a sonic signature of its own. A truly remarkable piece of work for the asking money.

THE LAST WORD
I feel that time will show this amp to be a tweaker’s delight. This one is going to appeal to those handy with a soldering iron and a penchant for capacitor change. Swap the security of the warranty for an upgrade in one or two key components by a DIY expert, and you are going to have a class A product to give you years and years of beautiful music on your hands. Perhaps Keces Audio might even offer to do this for you in subsequent products?

For a company previously limiting its operations to building and selling power supplies, this first power amp offering by a new name in the hi-fi market deserves a standing ovation. Bravo!

GEAR
Sources: Lenco 75 turntable (heavily modded) with Hana SL cartridge, Sony HAP–Z1SE digital player; Oppo BDP 83 SE / Amplification: Air Tight ATC-1 preamp, Bryston 6B SST and Conrad Johnson SA 250 power amps, Odyssey Khartago SE Extreme mono blocks / Speakers: Magneplanar 1.7 / Wires – Assorted, including ruthlessly revealing and very neutral sounding home-made interconnects, Analysis Plus interconnects, MIT MH 750 Shotgun and Gotham speaker cables.

Price: US$940
Malaysian price: RM3,999
Malaysian distributor: Maxx Audio Visual (+60-66014070)

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10 Comments

  1. essay create review essay create review
    February 26, 2018    

    940 dollars, are you out of your mind? I understand that music is expensive, but, are you serious?

    Reply
    • bal kaulsay bal kaulsay
      February 27, 2018    

      Thank you so much for writing in. No my friend, i’m not (in answer to your question). It is what it is. I have heard a few power amplifiers a lot more expensive that did not sound as good. If you know of any very good sounding power amps that are cheaper, do let me know, i would really like to listen to them. I wish you all the best.

  2. Rex Roy Rex Roy
    March 7, 2018    

    Hello Bal,

    I am writing from Vancouver, B. C., Canada. I am glad to see your ‘audioFi.net’ link on the ‘Daily Audiophile’ page.

    Thanks very much for writing the incisive S125 review and for providing the accompanying info.
    It is always interesting to hear/read about new(ish) (to me) companies, such as Keces, who are trying to offer what looks like very well engineered products at a very reasonable price. (And yes – US $940 is indeed a VERY reasonable price for a Power Amp, especially if it sounds as good as you indicate.) I am very interested in purchasing this amp, and am making inquiries to the U. S. / Canada distributor regarding certain (technical) questions that I have.
    You mentioned something in your review that I find quite intriguing, and that I have done with several amps in the past.
    Namely that this amp could be tweaked via the change / addition of higher quality caps. Could you be more specific as to the items and/or areas
    where improvements might be implemented? The first course of action, and one that I’ve done in the past, would be to increase the power supply capacitance from 40,000uf to 80,000uf. However, this appears to be a very compact chassis, with very little room to spare. This is one of the questions I am broaching with the distributor. What other capacitors / parts are you referring to?

    One more question if I may – The other power amp that I am currently considering is the Odyssey Khartago. I see that you reviewed this amp
    several years ago, and that you still have it listed as one your pieces of equipment. If the Keces S125 is very close in sound to your Bryston 6B SST,
    (I owned a 3B SST about ten years ago), any thoughts on how it compares to the Odyssey?

    Thanks again for the informative review. Any comments you can offer will be much appreciated.
    Best regards.

    Reply
    • bal kaulsay bal kaulsay
      March 9, 2018    

      Apologies for the delay in replying Rex. Alas i am not able to open this baby up without actually purchasing the review unit (which i was seriously contemplating… but i have too much stuff as it is so that idea has been put on hold for now). However, i have mates who have changed resistors and caps for me for various hifi equipment in the past.
      I recall a good friend of mine changing just one resistor on and old Aragon power amp and the gains in terms of transparency and increase in detail in the mids and highs were incredible. Just one resistor change. Another mate changed a few caps in an old Conrad Johnson SA250 again with elevated this already very good amp to a new heights of transparency and detail . My maggie 1.7s also have undergone a cap change, again the improvements are nothing short of remarkable. The internet is full of diy forums that i suspect soon will have modders playing around with the Keces power amp.
      My statements in the review were, for now, general. I don’t really know which cap or resistor to change until i get my paws on one and open it up and have a look around. It would be fun. But for now all i can say is i suspect this is entirely do-able.
      With regards the Kharthago, i have let mine go. I did NOT enjoy my pair of mono blocks at all. Strange, considering the almost universally positive reviews of it on the net. I found it cold, hard and a-musical. Perhaps i just ended up with a bum pair, altho i don’t think so as it was working perfectly in the hands of a dear friend prior. The highs were too etched and sounded like RF distortion to me. Was unable to ever listen to them for more than 20 mins. Also the 3BSST, i was fortunate to listen to one for a week in my system, and unlike the 6B SST ( which i find to be a pure joy in every way), i also found to be cold and clinical. No where as bad as the Khartago, but it did not synergise well with there rest of my hifi chain.
      Take care.
      Bal

    • SUJESH PAVITHRAN SUJESH PAVITHRAN
      March 11, 2018    

      The Khartago Extreme SE monoblocks were just a mismatch for your preamp, Bal, and/or something else in the chain.

  3. fitri fitri
    July 30, 2019    

    I think this year is still one of the audio power choices. is there recommendation in 2019?

    Reply
  4. zaurux zaurux
    August 14, 2019    

    And Tawain vs China : Keces S125 vs Audio-GD Master-3 ??

    Reply
  5. Link Betberry Indonesia Link Betberry Indonesia
    April 11, 2020    

    My brother suggested I may like this website.
    He was entirely right. This put up truly made my day. You
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    Reply
  6. ercalamar ercalamar
    May 27, 2020    

    I would like to see a Kinki Studio EX-M1+ review. Especially compared to Keces S125 (in bridged mode?)

    Reply
  7. AW AW
    June 3, 2020    

    Lack of transparency eh? You sure it wasn’t your DAC or Preamp?

    Reply

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