Which Amp to buy? The most frequently asked question on this site. READ THIS!!

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Big Dog RJ

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Thanks! I'm super happy with it, it sounds awesome and has looks to match. I really like the circuit design of this amp, it's so simple, outside of the power supply I think there's only 4 film caps in the whole amp outside of the power supply.

I have no experience with there newer offerings, I have seen the class D stuff but haven't heard it. I probably never will hear the newer models as that stuff is wildly expensive. I'm sure it's great stuff but making amplifiers from 500lb blocks of billet aluminum seems kinda excessive.

I actually reached out to Jeff Rowland Design Group and it sounds like they can get me the service records and even offer an "update" package. I'm waiting to hear back from them.
Yes, you'll be very pleased with this one, and there's really no need to change at this stage. Check on what upgrades they offer, as it may enhance performance in the long run. It's one of those company's that gets their customer service right! Many others fall short today...

JR-DG have come a long way with their Class D designs. In fact, it's probably the most advanced tech in Class D design and they sound pretty darn good. With the all aluminium design chassis, this is solely for heat dissipation and to maintain light weight, so a forklift is not required when moving...
Their matching preamps are equally good and can compete with the top dogs. Pricing is Aus for the entry level gear Model-125 starts at 3grand. So things do get pricey over here.

Look after it well and it should serve a lifetime!
Cheers, RJ
 

DanR

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Nice amp man and at a very reasonable price too! And Big Dog for one I think your comments are spot on! Also, good move on staying in contact with JR design group, these older soldiers need refreshing at some point to stay in the war and they very deservedly have a place on the front lines, these were great pieces of equipment built very well, take care of that new to you beauty!
 

Brandon Hartwick

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Thanks guys, good to know others feel the same way about this amp. I feel it was a great find and I'm not a huge fan of solid state amps usually but I love the way this one sounds.

I picked this up to use I'm place of my big tube amps for now. They have blew up rectifier tubes twice now and with the price of tubes right now that sucks, they will be shelved until I can have a look at them.
PXL_20220429_230705563.jpg
 

Flm09

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"What would be a good amp choice for my MartinLogan speakers"?

That is the most common question we hear on the site. The folks at ML hear it too.

Selecting the right amplifier is a HIGHLY personal decision. Before asking the question again, here are some things you should read first:

MartinLogan's guidelines on finding a suitable amplifier:
MartinLogan | Help Articles : Features and General Questions for Electrostatic Speakers

A section here on the MLO site of recommended amplifiers: Amplifiers
These are ML owners who have taken the time to write about the amplifier they're using with their system and what results they've had.

Search the "Members Systems" part of the site. Find owners with the same speakers you have and see what they're using.

Use the SEARCH function here at the MLO site. Read what others have asked and already answered!

An electrostatic speaker can dip down to less than 1 ohm in resistance, which many amplifiers cannot tolerate. An amplifier that doubles it's output when the resistance is cut in half (ie 250w @ 8 Ohms / 500w @ 4 Ohms, etc. ) is a good indicator that the amp is well built and stable.

As ML states on their site: ...it is important that the amplifier be stable operating into varying impedance loads: an ideally stable amplifier will typically be able to deliver nearly twice its rated 8 Ohm wattage into 4 Ohms and should again increase into 2 Ohms.


Do your research. Contact amplifier manufacturers and ask them questions about driving electrostatic speakers.

And lastly: You've made an investment in purchasing what we here at MLO consider to be the finest loudspeakers made. Don't cut corners when it comes to amplification.. Get the best amplifier you can afford. Your ears will be rewarded!
:music:
I love my all tube amplification! Sublime!😊
 

Ronin

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One amp I am really like right now that drives the CLS with no issues is the Michi X5. Look that one up if your curious. It pretty affordable too. 350 into 8 and 600 into 4. Another is the Dag Progression integrated but for a fraction of the cost, the Michi does it all and has digital AKM 728.
 

Big Dog RJ

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Nice one on the MICHI amplifier Ronin!

Have never heard or come across this particular one, in fact made by Rotel! Looks like Rotel's high-end version of what TEAC offers with Esoteric gear, which is very supreme indeed! Speaking of Esoteric, their digital playback systems use AKM chips in most of their DACs. Now Eso offers slightly different designed Dac's on their top of the line gear, being their own discrete ladder type DACs. Either way, this AKM stuff is definitely top notch!

If the MICHI X5 integrated can deliver that kind of power including the required current then that's all that's needed to drive and control stats efficiently. Sounds like a very good match with your CLS stats.
Cheers, and enjoy those fine tunes!
RJ
 

Ronin

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My buddy at TMR got me researching it. They make a X3 as well which would probably do the trick.

But the X5 is beast...

The Michi X5 Integrated Amplifier is Performance Redefined packaged in an exquisite industrial design delivering an astounding 600 Watts of Class AB power into 4 ohm speakers even under the most extreme loading conditions featuring an array of source inputs including Analog, Digital, XLR, apt-X Bluetooth, Moving Magnet and Moving Coil Phono Stage.
 

BDH55

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One amp I am really like right now that drives the CLS with no issues is the Michi X5. Look that one up if your curious. It pretty affordable too. 350 into 8 and 600 into 4. Another is the Dag Progression integrated but for a fraction of the cost, the Michi does it all and has digital AKM 728.
Glad to hear the Michi X5 is working out for you. I recently went thru a big amp search/upgrade and was considering a pair of the Michi M8's. I thought that they were just great looking amps, and was totally amazed at the power to price ratio. Pretty amazing! However, I got scared off by the Stereophile review where John Atkinson states...

'Rotel warns in the M8's manual that 4 ohms is the recommended minimum load impedance. I did think about examining how much power was available into 2 ohms once I had finished the testing, but when I reexamined how much power could be delivered into 4 ohms before doing so, I tripped the circuit breaker. Hint taken.'

That was all I needed to hear and I struck them from my list. I haven't read anything about the X5 though, so maybe it behaves differently... ;)
 

Ronin

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I heard the same thing in respect to don't get the separates. I was directed at the X3/X5. And what also helped is the description of the amp which reads in part " even under the most extreme loading conditions". Also I got 60 day return policy. I mean nothing is guaranteed. I have a buddy with a Dag pre and a Kassandra DAC and they won't talk to each other.

However , Now at least I can tell you from direct experience- NO issues or tripping! Also it can't hurt I guess that the amp is plugged into a dedicated 20a circuit as well.

I hear some MLs are much harder to drive than others. Especially the older ones. But I am not sure where the CLS II fits on that list. They seem to require no more out of the Michi (comparing SPL) than the YGs I traded at 87db.
 

Big Dog RJ

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Mmm... that's definitely not the first time I've come across this. There's a good mate over here who had the same exact issue. He was pretty furious after the return policy was not honoured... probably had their reasons, I don't know the details. However, the previous combination that he had, comprised of the Weiss DAC and a top line CJ preamp, was fantastic! I told him to just keep it!

Once your system has achieved a certain threshold, going beyond that point doesn't necessarily mean there's going to be significant improvement. It all depends on which areas you're trying to improve upon, and whether the gear matches with the other. If it doesn't, what's the point of spending huge amounts... really doesn't make sense.

The other thing I've noticed over the decades is that most who constantly upgrade, nearly all of them always tend to miss on one very important aspect, and that's their room! They don't seem to understand the importance of room parameters and room Acoustics, which is basically a component itself!

Unless this very basic element is addressed, it will never sound right. No matter how many thousands of dollars spent on gear, simply won't fix the room. System / component matching is so critical, as well as the room interaction and eventually when that happens to a positive effect, only then does the synergy work.

Keep it simple maties, and enjoy those fine tunes! RJ
 
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