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XP-10 verses RLD-1 2012 Platinum Edition

Well, someone asked me which one won!

The background to this BLOG is I purchased an PASS LABS XP-10 and felt it was too thin on the bass compared to my MAP-1 unit slipped into my Vandersteen Quatro system. I sold my Quatro's and MAP-1 with the DNA-225 and replaced them with C4 II signatures and kept the XP-10. The C4's still sounded thinner with the XP-10 than my liking, but better than with the Quatros. I assumed the preamp had to go, so I purchased an RDL-1 and sent it to SMc Audio for the full platinum mod. That took six months and in the mean time, I bought two Velodyne DD10+ subs for the C4's that REALLY opened up the basement! I finally got the RDL-1 from SMc Audio and that started the comparisons of these two units on C4’s with stereo subs. I have skin in the game times two want BOTH to win. But, there has to be a winner, to my ears.

For me, short term listening session tend to bring out the good points in a unit, and the longer you listen, the bad points surface. I used a CD-R to keep all the source material the same, and have about ninety minutes of uninterrupted music.

These two units still live at each end of the electronic world. The XP-10 is a solid state unit in spades, where the RLD-1 platinum is like a solid state tube unit. More explaining to do…

The RLD-1 pulls everything together to create a huge soundstage, but at the expense of each instrument surviving on it’s own. Each instrument gives up something of itself to “smooth” out the left to right image. This also tends to close in the expanse behind each instrument. The RLD-1 is super smooth and just doesn’t bite unless severely provoked. This sounds like tubes (conrad johnson ET3 SE I listened to at home at length) doesn’t it? Yep, the lows and highs are softer but the mids are very good on simpler music. But, the more complex the music, the harder it is to keep the open expanse around each instrument intact. This can create a matte from which the music is displayed verses an infinite backdrop around each instrument. When the music is interlaced, the openness around each instrument goes away, there isn’t “room” from which to place each unique instrument in space. But, the solidity of the central image is SOLID. Whichever instrument is loudest takes charge of where the image is. For the RDL-1, the simpler the music the better. It imparts a warmer even tone to everything. Bass is fuller and is to be more heard verses feel. All the sharp edges that might be sonically dangerous seem to be burred off. The more technical the music, the more it seems to smooth over. If you like tubes, this is a must listen to pre-amp. No one would say it doesn’t sound nice.

The XP-10 is about as opposite as you get. It’s a solid sate unit through and through. Micro dynamics, inner detail, utter blackness around each instrument is simply stunning. But, since each instrument is on it’s own, the image is a sole effort from each instrument so the sound stage is smaller around each instrument. However, the EXACT placement of every sound is dead nuts. The openness is extraordinary, as there is elbowroom around each instrument or voice. No matter how crowded it gets, the XP-10 still keeps every sound in its place. The dynamic range is more powerful in quickness and decay. Nothing seems to sneak by this pre-amp without faithful amplification. It is FAST. Oh yes, that can be hell on some material, too. But more on that later.

The deal breaker was the addition of the Velodyne DD10+ stereo subs to the C4’s. With the subs, the once thin sounding XP-10 simply took off. The bass is deep and visceral (like solid state!) and you could cut blocks from it and build a fort. This is not tube bass. If you don’t like your insides rearranged…solid state isn’t where you want to go! The weak point of the XP-10 was 100% vanquished with subs but without them, it sounded thinner than my liking. The change with subs was totally unexpected in its magnitude of improvement. But there was more…

The relaxed nature of my MONO KISMET amps comes through in spades with the hi-pass sub option. They are relieved of bass below 80 Hz so I have 6 dB or more of headroom. The amps are just not working too hard. What did this do? It took the edge off the midrange when I ran the C4’s full range. Yep, the KISMETS are not “big” amps (about 325 watts into 4-ohms) but not small either. That’s the problem, though. You tend to really overdrive them on dynamics and things get pinched and strident when SS amps do that. But, they are MUCH better running the C4’s 80 Hz and up. The XP-10 is just way better at telling you the amp isn’t happy than the RLD-1. It also doesn't hurt that as driver go higher in frequency, ones that move less sound better. Those two eight-inch C4 drivers are really calmed down with 80 Hz and below stripped away.

All this threw the equation to the XP-10. As much as I like the RLD-1 on material, I’m a solid-state kind of guy. I can’t give-up the dynamics, the blackness around each instrument and the vocal textures…both micro and macro. The C4’s / DD10+ combination are revealing to an extreme and seem to quietly go about telling you what’s hooked up to them. When I got to the end of the CD-R for a possible third round, I asked myself which unit I would have used…the XP-10. Which unit would I use as the “main” pre-amp…the XP-10.

Can you find a music source to say I’m wrong? Yes, you can. So can I. But in the end the XP-10 got a shot of double hi-fi VIAGRA with the subs. They got bass and a smoother voicing at the same time. This took an also ran and ran away with the contest. I was actually surprised.

The XP-10 needs BASS (if you don’t have it, you’ll know!) and PLENTY of clean power to sound right. Given those two ingredients and I can finally hear the following this unit has. It isn’t perfect. It is still too “winter” or cool sounding at times and can be sometimes so detailed your brain aches taking it all in.

For speaker auditions, be VERY careful of electronics. The C4’s sounded like two different speakers with the change in electronics. Two people would review them vastly different and the speaker isn’t changed any at all! My experience with modern hi-fi components drive this point home to the point of making it hard to decide WHAT I’m listening to during an audition. A speaker of the caliber of the C4’s, and there are many, are being spoken for by the electronics in a BIG way least we forget. I would change electronics on purpose to see what voice it is you’re hearing, and what the ultimate potential of the speaker really is.
rower30
peterayer
1,382 posts
 
Rower, that's a very interesting read. Thanks. I have Pass XA.5 amps and the
XP-20. The paragraph in which you describe the sound of the XP-10 with
pinpoint location of each instrument, black backgrounds and isolated space
between the instruments, say a lack of sound fill in the staging or voids in the
spaces, is exactly what I heard with the XP-20. Until recently that is.

I just upgraded my analog source to a massive suspended turntable with a
12" arm. I don't know much about digital, but this upgrade resulted in
major improvements in exactly that weak area of the XP-20 soundstaging
characteristic. There is so much more harmonic information and density of
sound around the instruments that the space between the instruments is now
filled and continuous. It is much more believable.

I now conclude that this was not a characteristic of the XP-20, but rather a
shortcoming of my former turntable. The XP is so transparent and neutral
that I find whatever musical information is reproduced at the source simply
passes through the Pass electronics on its way to the speakers.

Also that lack of bass you describe, that was a shortcoming of the analogue
source too, not the pre amp in my experience. I find it difficult to criticize
these pre amps.

Congratulations, the XP is a superb product.
rower30 OP
211 posts
 
The XP-10 isn’t perfect, like I said. But yes it is hard to characterize the sound. I agree that the extreme detail can be almost too much, but my ear is happier there than too smoothed over where dynamics and individual expressions of each sound are a "group" affair. Again, this is my ear's preference. I like my music capitalistic where every sound is it's own effort, not socialistic where it's all a group effort.

As far as bass, the XP-10 can be can indeed be thin compared to ANY other pre-amp I've used, and with the same source material. That is until I added the DD10+ subs, something happened there that was a big surprise. I have no clue why the bass IS INDEED thin with the C4's full range. It was thin with my Quatro, too, and they have powered subs. But, I call it like I hear it with the subs on the C4's. The bass is crisp, fast and detailed. It is still a hard-hitting physical bass, however.

But I 100% agree that the XP-10 lacks harmonics between the space around each instrument that adds the "timber" to music. This is what makes it sound hard at times. No, I didn't say it has none, it is just weakest here. Piano's can sound too thin and lack body, for instance.

Playing with preamps has been fun. It's also discouraging, as I know how hard it is to really get one right, and how important it is. At an affordable price point, you have to align your ear’s preferences to a "place" that makes you happy knowing full well the trade-offs. To that end, I at least try to characterize the pieces I've used to allow people to center them up to what best fits their ear.
peterayer
1,382 posts
 
My only point is that the characteristics that you ascribe to the XP-10 in your system I heard also in my system with the XP-20. I had thought it was a characteristic of the pre amp. I was very mistaken. What I thought were shortcomings in the XP-20 were eliminated completely when I upgraded my front end. Therefore, I concluded that the XP-20 is actually quite neutral and transparent as changes upstream were easily heard and identified. Of course, I may have reached the wrong conclusion, and it seems not to be consistent with your findings.

What happens to the sound of your XP-10 when you switch cartridge or arm or turntable? Does it still repress harmonics and does it still sound thin?
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