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Amplifier Upgrade Decision

Hello,
I need some help/feedback with regards to upgrading my power amplifier for 2 channel music. My current set up includes following components
1. Source (Digital)- Oppo BDP-95
2. Source (Analog)- Clearaudio Concept Turntable
3. Pre-Amplifier- Parasound Halo JC-2
4. Pre-Amplifier- Parasound Halo P-7 (using the phono interface for playing the turntable)
5. Power Amplifier- Parasound Halo A-21
6. Front Speakers- Aerial Model-7T
7. Power Cable- Nordost Heimdall 2 and Red Dawn 2
8. Interconnect Cable- Nordost Frey 2, Heimdall 2 and Red Dawn 2
9. Speaker Cable- Nordost Red Dawn 2
10. Wall Receptacle- Furutech GTX-D NCF(R)
11. 2 Dedicated 20 Amp (10 AWG) circuits feeding the entire system
12. GIK Room Acoustics Bass traps/Diffusors
13. Room size- 16’ X 12’
This set up sounds good but I wanted to take it to the next level and wanted to upgrade my amplifier to a better 2 Channel amplifier or a set of mono-blocks. I love Class A/AB sound and would like to stick to this technology. My choices, not in any particular order, are
1. Upgrade to a Plinius SA 103 (125 W pure Class A per channel) and use it as a 2 channel amplifier
2. Upgrade to a set of Class-A mono-blocks. My choices, not in any particular order, are
    a. Parasound Halo JC-1
    b. Pass Labs XA-60.8
My budget is around 10-12K.

I know everything is system dependent but I would love to hear your opinion on these amplifiers before starting on product evaluation.

I am also not sure if my mono-block amplifier choices would provide significant value add from a sound perspective over the Plinius or any other good quality 2 channel amplifier at this price point. So I would love to hear your feedback on this point as well.

indranilsen
auxinput
2,920 posts
 
The JC1s are fully differential/balanced on the amp output circuit, plus having a much larger power supply and transformer.  These amps have more of a Class AB circuit (with an option for Class A bias) and are going to have more brute force for bass punch/control and dynamics. Since the 7Ts do drop down to 3.5 ohms, this might be the better choice.
The plinius/pass choices are going to be single ended amp circuits, but the full Class A may have a sweeter or more musical sound to your ears. (Not to say that the JC1s will be bad - they will still sound great).
indranilsen OP
113 posts
 
Thank you guys for your feedback. Very helpful indeed. I think Halo JC-2 is very good pre-amplifier at that price point, at-lease it blended really well in my system. Previously I was using P-7 to drive Halo A-21 but upgrading the pre-amplifier to Halo JC-2 brought a huge improvement all over the audio domain. The most notable factor was the quality of bass coming out of Halo A-21 in this combination. 
I was initially thinking of getting a pair of Halo JC-1s because it is a very good amplifier and would make this transition very smooth for me. However I am willing to give Pass/Plinius a try because of the reasons that auxinput mentioned above. I am really curious to find out what this more musical/sweet (when using a pure Class A amplifier) means from a sound perspective. Any feedback on this would be very much appreciated.
Also any opinion on using a set of mono-blocks over a stereo amplifier? In theory the mono-blocks win but I wanted to hear from folks who have used both and have an opinion on this item.
 
almarg's avatar
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almarg
9,670 posts
 
The plinius/pass choices are going to be single ended amp circuits, but the full Class A may have a sweeter or more musical sound to your ears.
I'm pretty certain that the Pass XA60.8 is a fully balanced amplifier.

Regards,
-- Al
 

ricred1
2,058 posts
 
I should add, I had Aerial 7T's when I had the A21 and JC-2.
4425
861 posts
 
Your budget is so close to a listed Agostino momentum amp. One to buy and enjoy for years to come. You can also update much later to S250 or whatever is current at the time. A handmade beauty to keep for years. At under 15k it's a very good deal. Truly a buy and check off the list component. 

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