Parasound Halo C 2 Surround Processor and A 51 Multi-Channel Amplifier Reviewed

By |

Page 1 Page 2


Parasound is one of those companies that has been steadily churning out products that have provided intelligent engineering and great value for the money for the better part of two decades. Richard Schram, the owner, enlisted the help of renowned audio engineer John Curl a decade ago to help with the design of Parasound's amplifiers. This has resulted in a series of well-received amplifiers that also scored well on the value front.

Additional Resources
Read more Parasound Reviews from here.
Read more high performance HDMI AV Preamp Reviews from Parasound, Lexicon, NAD, Sunfire, Krell, Meridian and many other brands...

Over the past few years, the Parasound lineup has changed very little as work has commenced on their new flagship Halo line of audio products. When the Halo line was first shown last year at CES, there was an enormous amount of attention because the products (which have not been shown in actual operation) were not only very interesting technically, but simply stunning aesthetically. The buzz around the Halo line grew louder over the past year as more details have become available, and crescendoed this past January at CES as they were finally about to be released. Richard Schram has been overwhelmed already with the response to the Halo line, but has been kind enough to send one of the very few C 2/A 51 combinations available for review to DVD ETC. and yours truly.

The Halo lineup has within it two surround sound processors, the $6,000 C 1 and $4,000 C 2. The C 1 has a 5" LCD screen so your television and projector does not need to be turned on to use the menus or preview a disc, and does have a few extra features over the C 2 such as an extra component input. The C 2 is the real value of the pair (even though it is not as sexy as the C 1), as you get pretty much the same audio innards as the C 1 without some of the extras for less money, so we chose to review the C 2.

The $4,000 A 51 amplifier is a John Curl design, and uses the same circuit topology as the JC 1, the flagship monoblock amplifier that has already received critical acclaim since its release. This is an excellent pedigree to be derived from and, although the 5-channel A 51 cannot match the sheer, total grunt of the single channel JC 1, it still does not fare too badly at 250 watts per channel at 8 ohms, and 400 watts at 4 ohms. It also has a peak current output of 60 amps, a significant number for those of you who own difficult-to-drive speakers that crave current as if it's an addiction.

C 2 Processor

Unique Features - When the C 2 processor arrived, I found it very intelligently double boxed. To my greater surprise, I found the processor in a purple velvet drawstring bag instead of just a plastic cover--a very nice, sophisticated touch, which might alone be enough to make me buy it. When removed from the bag, the first words from my mouth were "simply stunning." The C 2 has a curved polished aluminum front panel with a central blue LED display, exit and menu buttons surrounded by blue LEDs to the right, and mute and dimming buttons also lit to the left. Next to the latter is the IR remote window, the headphone jack and the calibration microphone jack. The indented trough that runs along the bottom has the power switch, zone switch, source switch, and surround mode switch. These four buttons are surrounded by a blue "halo" of light that is dim while the unit is in standby, and brightens when powered up (hence, the Halo name). A jewel-like touch is added to the center by a red lit "P" above the Parasound name that also brightens upon power-up. The rest of the metal casing is in a light grey that matches perfectly. Fit, finish, and build quality are beyond reproach, and the overall effect is beautiful, and very elegant. Although some may find the extra lights to look a little busy in comparison to the simplicity of the Krell equipment (a comment by the Lady Jacqueline who rated the C 2 a lofty 9 on the LJAF), I find the aesthetics to be among the best available. In this, Parasound is very much like KEF, as its cosmetics have now gone from dowdy to art deco beautiful.

Parasound continues to impress once the remote box is opened as it contains the excellent Home Theater MX-700 remote system which comes with a small "sidekick" ancillary remote, and a cable to hook it up to your computer for programming. The remote is also in a lovely shade of subtle silver-gray with bluish-teal backlighting. Another box contains the power cord, a bag of RCA-BNC connectors for the component jacks, the calibration microphone, and trigger cords. Even the manual is easy to read and carefully explains the workings of the C 2 in plain English.

Installation/Setup/Ease of Use - Turning to the back of the C 2 reveals a system similar to the Krell Showcase with completely assignable S-video, composite, analog audio, digital audio (Toslink and coaxial), and 12 volt triggers. There are balanced and unbalanced outputs for all channels, one pair of balanced analog inputs, and a 7.1 analog input for SACD/DVD-Audio players. There are outputs for a second zone, and controls are switched for either zone by the front zone button. The component video switching is very wide bandwidth, easily handling even 1080p switching, and consists of two inputs and one output. Both curiously enough, are not in RCA format, but the more stable, higher end BNC connectors. Those with regular RCA cables need not fret, as the conversion connectors are included. Right smack in the middle of the back panel is a small metal plate that is intended as a future expansion port (Firewire, HDMI switching perhaps?), as well as a "Made in Finland" logo. Yes folks, the C 2 was designed and built mainly in Finland, by all of those intelligent engineers that have to spend those cold, long, dark winter days indoors.

The C 2 is fully stocked with all of the latest surround modes including DD EX, Pro Logic II, DTS Neo:6, nix Ultra 2 processing, and Stereo96 which up-samples from 48 kHz to 96 kHz. There are also modes to compress the dynamic range for late night watching, and an EBass mode which feeds bass information from all channels to the subwoofer even if they are set to "large" in the setup menu. This is very handy, as it allows you to switch from the remote whether or not you want deep bass information going to your speakers or not. Speaking of the setup menu, it, too, is logical, easy to use, and very flexible. In fact, I found it overall one of the easier setup menus I have used. The source inputs are initially called video 1-6 and audio 1-4, and they can all be renamed in the setup menu. There is a flexible crossover for the subwoofer that ranges the cutoff from 40 to 140 Hz in 10 Hz increments. There is also Halo Setup software that allows you to set all of the parameters of the C 2 using a computer hooked up with a (yes, again included) serial cable.

In addition to the normal 7.1 setup there are four other channels that can be used. There is an output for an extra subwoofer, and one that provides under 20 Hz signals for a tactile transducer. The other two channels are much more special as they are completely programmable. These two channels can be used to setup speakers pretty much anywhere you want from a "height" speaker placed on the ceiling above the display, to an extra pair of surrounds for a long theater room. The information from these speakers is completely programmable from the 7.1 channels. Let's say you want to create an extra pair of surrounds for a long room. The information can be mixed partially from the surrounds and partially from the fronts. It can also be filtered to remove certain low or high frequencies. By the same virtue height channels can be created by mixing parts of the center, left and right speakers and rolling off the high frequencies so it is not overly prominent. I did not try these programmable channels, as I simply am not equipped with a room that can house all of these extra speakers, but these may be the tweaker's ultimate delight. Think you can do one better than Dolby Labs or THX? Here's your chance to create a 10-channel system.

The auto calibration system is very unique, allowing for proper setup of levels and distances by a microphone connected to the processor and placed in the main listening position. The microphone plugs into the front panel, the auto-calibration sequences are activated, the microphone is held close to the level of your ears. The processor goes through three tests for each channel, and determines distance and level compared to reference level. Thankfully, it does so at moderate noise levels and in short bursts of pink noise, as long exposure to loud pink noise is something I like to avoid if I can. Overall, I found it to be fairly accurate, and I only made a couple of minor tweaks afterwards. Although one can take out the SPL meter and work on this manually, this really makes life a lot simpler for the majority of buyers, and I think it is a real plus in a processor.

The C 2 was set up in my system using AudioQuest Python interconnects between the C 2, the amp, and sources. Digital connections were via AudioQuest Optilink-5 and VSD-4 cables. Video cables used were Tributaries S-video and component. Power conditioning was supplied by a Monster HTPS 7000. AudioQuest Gibraltar speaker cables were used between the amp and KEF Reference 207 fronts, 204c center, and 201 rears. Amps used were the Classe CAV-150, the Parasound A 52, and the Parasound A 51.

Final Take - After assessing all that, and giving the unit appropriate time to break in, it was finally time to start listening to the C 2 and see if it actually lives up sonically to all of the hype. First off was using the Krell DVD Standard as a transport and assessing the sonic signature of the C 2. The midrange is slightly laid back, expansive, and crisp like my reference Krell Showcase processor. The top end is slightly rolled off, but clear and transparent. The bass drive is dynamic, rhythmic and taut. The imaging is excellent, and the soundstage wide--just about as wide as the Krell Showcase. In fact, except for the slightly rolled off top end, the crispness and expansiveness reminded me of the Krell. The overall performance was very good for two-channel.

When tested as an analog pre-amp with the balanced outputs of the Krell DVD Standard, the rhythmic bass drive remained, but the midrange and top end opened up and sparkled even more. It was as if a veil had been lifted off the midrange/tweeter/hypertweeter unit of the 207s. The Krell DVD Standard is designed to give world class two-channel performance, and the C 2 did an impressive job of letting it shine through. In fact, combined with the excellent bass extension of the A 51 when I added that to the system, this performance was absolutely sparkling and never bright; testament to the clarity of the Krell, and the transparency of the C 2 as an analog pre-amp. This is not to take away from the performance of the C 2 as a DSP in two-channel mode, it simply was designed to do multiple things at the $4,000 point, while the Krell was designed to be an all-out 2-channel performer.

Movie processing with the latest processors is uniformly excellent, a result of the excellent digital front ends being constructed today. That said, the C 2 is at the head of the pack in this area with its clarity, steering, and ability to create a cohesive soundfield. THX processing is easy to activate, but often unnecessary due to the smooth sonic top end.

Performance as a 7.1 analog pre-amp for SACD/DVD-Audio was also excellent. I used the Marantz DV-8300 universal player as my source, and the C 2 once again was as transparent as I could ask from a surround processor. There is a separate setting for the 7.1 inputs; they do not have to be assigned to any of the other audio or video inputs.

A 51 Amplifier

Unique Features - The second part of this duo is the A 51 5-channel amplifier. Interestingly enough, when I first received an amp with the C 2, I did not check the model number, and initially did not notice that it was the $2,000 125 watt/channel A 52. As I mentioned at the beginning, the A 51 is rated at a very healthy 250 watts/channel at 8 ohms, and 400 watts/channel at 4 ohms. The A 51 is taller than the A 52, but has the same gorgeous aluminum front with a large lit "P" in the center, a "halo" blue power switch, and 5 small blue lights for each channel in the indented trough. The A 51 also differs cosmetically by having large, silver heatsink fins on each side and on the back. The A 51 runs warm at low levels, as it runs in Class A for the first 6 watts per channel, before switching to Class AB. In fact, I would recommend good ventilation for this unit, as it does function well as a space heater.

Installation/Setup/Ease of Use - None of this was known to me at first, as I just took out the amp, removed my Classe' CAV-150, and put it into my system. Both amps have the ability to be powered on by the front panel, by 12V trigger, or turn on automatically when a signal is detected (very handy). I powered it up and, even during the first couple of hours of break in, was struck by the increase in bass extension with the KEF 207s in comparison to my Classe'. As it broke-in over the next couple of days, I really liked the way it sounded: clean, neutral, but with a top end a little less transparent than my Classe'. Imagine my shock when, upon talking to Richard Schram, I discovered that I had the smaller amp in my system! Parasound immediately shipped me out the A 51.

The A 51 is a bit of a back-breaker at 80 lbs. It really is a gorgeous piece with its silver heat fins, and its massive construction. The Lady Jacqueline gave it a very high LJAF of 9.5. It has balanced and single-ended inputs for all five channels on one side of the rear heat sink, and solid binding posts for the speakers on the other side. I have been told that a 7 channel version is not planned at this point, as keeping the performance the same would entail that the amp would weigh in excess of a 100 lbs. For those that want seven channels, you can mate an A 21 which is essentially a 2-channel A 51, or go all the way with a pair of JC 1s.

Final Take - As nice as the A 52 was and, indeed, it was one of the best $2,000 amps I have heard, the A 51 is simply better in all respects. After appropriate time breaking in, the amp had simply excellent control over the bass drivers of the KEFs, testimonial to its ability to generate lots of current. The bass extension is simply wonderful: copious, deep, taut, and rhythmic. Midrange transparency is also excellent, and the amp has a neutral, clear, crisp character. Top end is very smooth and very neutral. The smoothness of this amp mated very well with the softness of the KEF's midrange to create excellent clarity.

In two-channel mode, there is an enormous amount of effortless power--beyond what I needed. It is this kind of smooth power that allows for total control of a speaker. Micro-dynamics are smooth and well-delineated, and listening to music using the Krell DVD Standard via the analog inputs of the C 2 was a very pleasing, engrossing experience. The experience is so strong, that I found myself in musical nirvana, and started pulling out old CDs from my collection. Although these electronics and the KEF Reference speakers are very revealing, the dynamic energy created by this amp in conjunction with the C 2 and the Krell made even some of my old, poorly recorded CDs sound good. I found that this amp was able to help extract the bass in even heavily compressed recordings, and helped balance the bright, smeared compression artifacts sometimes found in the top end. In fact, with good cables, the combination of the excellent analog bypass in the C 2 and the transparent neutrality of the A 51 really allowed the Krell DVD Standard to show off its ability to resolve enormous amounts of top end information.

Read much more on Page 2

  • Comment on this article

Post a Comment
comments powered by Disqus

HTR Product Rating for Parasound Halo C 2 Surround Processor and A 51 Multi-Channel Amplifier

Criteria Rating







Disagree with our product rating? Email us and tell us why you think this product should receive a higher rating.

Latest AV Preamplifier Reviews

Dec 31
Marantz AV8805 AV Preamp Reviewed Brian Kahn puts Marantz's flagship AV preamp through the ringer to see how it stacks up with previous models and the current state of the art.
Marantz AV8805 AV Preamp Reviewed

Dec 10
Home Theater Review's Best of 2018 Awards Here at the end of 2018, we at look back at all the products we reviewed this year and pick the best of the bunch, from budget favorites to aspirational flagship products.
Home Theater Review's Best of 2018 Awards

Oct 15
Trinnov Altitude16 Home Theater Preamp/Optimizer Reviewed The Trinnov Altitude16 delivers pure audio bliss, says Dennis Burger, with more configuration features than most people would have any clue what to do with. But sonic perfection does come at a price.
Trinnov Altitude16 Home Theater Preamp/Optimizer Reviewed

Sep 24
Lyngdorf MP-50 AV Preamp Reviewed Its price may be a bit daunting, but Greg Handy argues that the Lyngdorf MP-50 actually represents an incredible value, when you consider the products it competes against.
Lyngdorf MP-50 AV Preamp Reviewed

Dec 18
Home Theater Review's Best of 2017 Awards It's that time of year again--when the staff looks at all of the products we reviewed this year and picks the best of the best. We've tried to hit all the product categories and price points. We hope you enjoy our Best of 2017 list.
Home Theater Review's Best of 2017 Awards