Parasound Halo P 7 Multichannel Preamplifier, A 51 Multichannel Amplifier & JC 1 Single-Channel Amplifier HT Labs Measures

HT Labs Measures

Parasound Halo P 7 Multichannel Preamplifier

Analog frequency response in Tone Off mode:
–0.05 dB at 10 Hz
–0.01 dB at 20 Hz
–0.15 dB at 20 kHz
–0.99 dB at 50 kHz

Analog frequency response with Tone On, controls zeroed:
–0.15 dB at 10 Hz
–0.24 dB at 20 Hz
–0.49 dB at 20 kHz
–1.43 dB at 50 kHz

The chart below shows the frequency response of the left channel from balanced input to balanced output in Tone Off mode.

Response from the multichannel input to the main output measures –0.05 decibels at 10 hertz, –0.01 dB at 20 Hz, –0.08 dB at 20 kilohertz, and –0.56 dB at 50 kHz. The analog THD+N was less than 0.025 percent at 1 kHz with a 100-millivolt input and the volume control set to 86. Crosstalk with a 100-mV input was –90.29 dB left to right and –91.31 dB right to left. The signal-to-noise ratio with “A” weighting was –120.48 dBrA. —MJP

Parasound Halo A 51 Multichannel Amplifier

Two channels driven continuously into 8-ohm loads:
0.1% distortion at 301.1 watts
1% distortion at 330.6 watts

Five channels driven continuously into 8-ohm loads:
0.1% distortion at 198.7 watts
1% distortion at 238.4 watts

Frequency response RCA input:
–0.04 dB at 10 Hz
–0.01 dB at 20 Hz
–0.09 dB at 20 kHz
–2.94 dB at 50 kHz

Frequency response XLR input:
–0.04 dB at 10 Hz
–0.01 dB at 20 Hz
–0.08 dB at 20 kHz
–2.99 dB at 50 kHz

This graph shows that the A 51’s left amplifier channel, with two channels driving 8-ohm loads, reaches 0.1 percent distortion at 301.1 watts and 1 percent distortion at 330.6 watts. Into 4 ohms, the amplifier reaches 0.1 percent distortion at 357.2 watts and 1 percent distortion at 422.8 watts. An input level of 102.2 millivolts was required to produce an output of 2.83 volts into an 8-ohm load, indicating an overall gain of +28.87 decibels using the RCA input. When using the XLR input, a level of 105.1 millivolts was required to produce an output of 2.83 volts into an 8-ohm load, indicating an overall gain of +28.62 dB.

THD+N from the amplifier was less than 0.015 percent at 1 kilohertz when driving 2.83 volts into an 8-ohm load using the RCA input. When using the XLR input under the same conditions, THD+N was less than 0.015 percent. Crosstalk at 1 kHz driving 2.83 volts into an 8-ohm load was –93.34 dB left to right and –94.94 dB right to left using the RCA inputs and –100.64 dB left to right and –96.79 dB right to left using the XLR inputs. The signal-to-noise ratio with an 8-ohm load from 10 Hz to 24 kHz with “A” weighting was –99.03 dBrA using the RCA input and –99.30 using the XLR input. —MJP

Parasound Halo JC 1 Single-Channel Amplifier

One channel driven continuously into an 8-ohm load:
0.1% distortion at 499.1 watts
1% distortion at 582.4 watts

Frequency response RCA input:
–0.03 dB at 10 Hz
+0.00 dB at 20 Hz
–0.11 dB at 20 kHz
–3.44 dB at 50 kHz

Frequency response XLR input:
–0.04 dB at 10 Hz
+0.00 dB at 20 Hz
–0.22 dB at 20 kHz
–3.60 dB at 50 kHz

This graph shows that the JC 1 in High Bias mode, driving an 8-ohm load, reaches 0.1 percent distortion at 499.1 watts and 1 percent distortion at 582.4 watts. Into 4 ohms, the amplifier reaches 0.1 percent distortion at 608.7 watts and 1 percent distortion at 835.9 watts.

An input level of 100.5 millivolts was required to produce an output of 2.83 volts into an 8-ohm load, indicating an overall gain of +29.00 decibels using the RCA input. When using the XLR input, a level of 101.5 millivolts was required to produce an output of 2.83 volts into an 8-ohm load, indicating an overall gain of +28.92 dB.

THD+N from the amplifier was less than 0.004 percent at 1 kilohertz when driving 2.83 volts into an 8-ohm load using the RCA input. When using the XLR input under the same conditions, THD+N was less than 0.007 percent. The signal-to-noise ratio with an 8-ohm load from 10 hertz to 24 kHz with “A” weighting was –109.45 dBrA using the RCA input and –103.88 using the XLR input. —MJP

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(415) 397-7100
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COMMENTS
Langood's picture

Two weeks ago I finally took the plunge, and embarked on upgrading my system to separates. On a budget mind you...laughter.

Added a Outlaw 7125, to my Yamaha 995, Sony BDP-570, Samsung LN610C, a pair of B&W601 and a Velodyne 3750DLS sub.

When I first turned on the system to listen to some blues on Slacker radio via the Sony BDP-570. I thought I had miss placed the speakers. I could hear piano here. Bass there. Voices just slightly off center. So I got up and checked the speaker placement and they were toed in just as it should be.

Back to the couch I went. Listen again. And began to cry. I realized I was hearing all the things Scott, Daryl, Kris and a whole lot of guys speak of or write about when they review power amps, processors and speakers.

THANK YOU GENTLEMEN.

Then along comes Kris with his review of the Parasounds less than a week later and the lusting has started again. Thanks Kris for ruining my life he said laughing.

By-the-by Kris I'll take the big Outlaw off your hands if you are donating it to charity.

To ALL reviewers. I know you enjoy your jobs. But here is a heart felt thank you for all the work you do in bringing understanding to what we the consumer should be looking for and hearing in the equipment we consider and buy.

LG.

David Vaughn's picture
LG, Thanks for the kind words to us reviewers. It's a fun hobby to have and it's always nice to have a new piece of gear to test out every month or so.
chinito's picture

Hi David

Which do you think is better the ATI 3007 or the Parasound A51?

Thank you
Chinito

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