Power Amplifiers

Parasound New Classic 5250v.2 Multi-Channel Power Amplifier


Design and Setup

In my system the Parasound 5250v.2 was controlled by a Denon 4308 receiver, with sources from an Oppo 981-HD universal player sending SACD over HDMI to the Denon, an Onix XCD-88 HDCD player via co-axial digital connection for Rebook and HDCD playback and a PS3-slim used for Blu-ray playback.

This amplifier features three turn-on options, a front mounted power switch, a 12v trigger and an audio sensor. I first used the audio sensing turn on, (which is only on channels 1 and 2 so make sure those channels are hooked up to your Left/Right preamp outputs). While the amp turned on quickly, it would also turn off too soon for my liking. The manual states it takes 15min of quiet before it would turn itself off, in use I found it to be between 5 and 10 minutes. I changed to the 12v trigger option which turns the amp on whenever my Denon 4308 receiver is turned on.

Speakers used were MartinLogan Vista Electrostatics in the front with a MartinLogan Stage in center and a pair of Raw Acoustics OB2X in the rear. The Vista speakers are 4ohms which can drop to 1.2ohms, while the Stage is 8ohms, dropping to 2.1ohms the rears are 8ohms, dropping to 4.2ohms and all speakers are roughly 90dB efficient.

Bass for my theater room comes from a MartinLogan Descent i and a Velodyne IC600 12" ceiling mounted sub. The sub-woofers only handle frequencies from 50Hz and below, with equalization done for the subs with the Denon's auto-eq (no equalization is applied to the rest of the speakers). Calibration was done using the Denon's auto setup feature and speaker placement was unchanged from my previous amplifiers.

My listening room is medium to large, 18' x 15' with 8' ceilings. The room has large openings on three sides to adjacent rooms which increases the effective area considerably. My room currently has no room treatments, and careful positioning of the speakers have resulted in excellent imaging and depth, albeit with a narrow sweet spot. The front speakers are toed in slightly and their dipole design reduces side wall reflection issues which allows for more direct sound.