Denon POA-A1HDCI User Manual download pdf (Page 5)

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stable performance with low impedance

(4-ohms) speaker loads, even in bridged

mode. In fact this is the industry's first

4-ohm UL rated amplifier I’ve come

across.This is quite an engineering feat

for a multi-channel amp which requires

a helluva lot of heat sink area and high

current devices to double down its

power with halving load impedance while

meeting the stringent heat dissipation

requirementsofUL.Todo150wpcinto

8-ohms like this amp is rated, you need at

least 55V rails so the 80V caps have more

than enough design margin to ensure this

amp can deliver more than rated power

and not get wigged out during high line

voltage conditions when plugged into

a power conditioner that does voltage

regulation. The POA-A1HDCI appears to

be a very conservatively rated 150wpc

x 10 amplifier with good headroom to

help prevent clipping during high power

demands.

Listening Test

CD:

Dianne Reeves

Never Too Far

This is the first

CD I turn to when

initially calibrating

a system as many

of the tracks in

this CD are an

awesome test for a system's bass response

and accuracy. The bass track in Track #2

“Never Too Far” will sound muddy or weak

on an improperly set up or inadequate

system. I initially ran just my front main

speakers bridged to the POA-A1HDCI to

determine how cleanly they would play

once I started pumping the volume up. The

presentation was free from audible strain or

graininess and the system's bass response

was tight and articulate - just as it should be

whendrivenbyqualityelectronics.Thetonal

balance seemed slightly more forward than

what I recalled when the amps in my Denon

AVR-5805 were powering my speakers but

it also seemed more grandiose. I found the

POA-A1HDCI displayed excellent stereo

separation portraying Dianne’s powerful

vocals dead center. The drums had a nice

pop to them while the saxophones exhibited

a nice bite giving you that “live” feeling. The

soundstage was very expansive making me

feel the “never too far…" chants from the

backing vocals where emanating from my

side channels despite the fact that I was

only listening in stereo. The POA-A1HDCI

maintained a very clean composure even

whendriventoLOUDERthancomfortable

listening levels in my nearly 6,000 ft^3

Auralex acoustically treated listening room

sitting16ftawayfrommyspeakers.Switching

over to PLIIx Music mode was like being

thrown right into a high power nightclub.

Now I had all the speakers powered off the

POA-A1HDCI and instead of running out

of gas, it seemed to want to play louder so I

continued increasing the volume hypnotically

watching the needles on the power meters

pumpawayflirtingintothered+4dBlevels

during bass transients in track #3 “Come

In”. The floor in my theater room shook as

if it was alive and the transients in the sax

sent chills down my spine. Although this was

insanely loud, it didn’t at all seem strained

and I had to remind myself as my SPL meter

hit110dBtransients that I was listening at

unsafe levels.

SACD:

Patricia Barber

– Night Moves

Track #1 “Bye

Bye Blackbird”

revealed that the

POA-A1HDCI can

handle delicate

musical passages

with authenticity. Piano music is very hard

to accurately reproduce as the harmonic

overtones are quite complex. The POA-

A1HDCI’s low noise floor revealed all of

the nuances with plenty of depth at airiness.

I heard all of the presence in the cymbals

of Track #2 “Invitation” with plenty of

body in the music. Basswas abundant and

well extended in track #3 “Yesterdays”.

I switched the processor to pure direct

and just sat back listening to pristine two-

channel audio that would make even the

most critical of audiophiles drool over. The

Denon gear was driving my speaker system

with ease and adding no sonic nasties

that would distract my enjoyment of the

listening session no matter what power

level I was running at.

CD:

Pat Metheny –

Off Ramp

No serious

reviewer forgets to

throw in a little Pat

Metheny in their

product reviews,

especially when

testing out top echelon gear like this. I

pulled out an oldie but goodie and took

it for a spin using PLIIx Music Mode. I was

“The Denon POA-A1HDCI

is a no holds barred, no

compromise multi-channel

THX Ultra2 certified

amplifier design that

represents some of the best

engineering I’ve seen…”

Gene DellaSala

Once an amp runs out of headroom

it enters a mode commonly referred

to as “clipping”. When an amplifier

clipsitessentiallysendsasquarewave

response or DC voltage to the speaker

which after only a few short cycles

can fry a tweeter's voice coil or burn

out series inductors in the crossover

sections.

Editorial Note

on Amplifier Clipping

1 2 3 4 5 6 7 8 9 10

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Denon POA-A1HDCI User Manual Page 5

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