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climactic sequence, the extravagant de-

mands of "big-sound" impacts and colli-

sions were met with surprising realism.

In my standard checks for center-speak-

er performance, the 4200 C was a near per-

fect tonal match for the 4200 LRs, and its

midrange tones changed very little as I

moved off-center. Vertical positioning was

just as critical for the 4200 C as for the

4200 LRs. Fortunately, the center speaker

incorporates a tiltable base that makes aim-

ing the tweeter easy. It's cleverly simple

and effective, but it does raise the speaker a

couple of inches higher than optimal for

TV-top placement.

Okay, okay, I'm nit-picking. Atlantic

Technology's System 4200 is simply an

outstanding speaker suite for medium-size

rooms. It might not be my ﬁrst choice if all

I played was stereo music — but I can't

imagine anyone seriously considering it

primarily for that. For everything else,

movies and multichannel music alike, it's

an undeniable winner. I don't think you

can ask for much more from so compact a

speaker system. Expensive? Yes. Worth it?

Absolutely.

Sensitivity (SPL at 1 meter with 2.8 volts of

pink-noise input)

front left/right .............................................88 dB

center ........................................................89 dB

surround ....................................................88 dB

Impedance (minimum/nominal)

front left/right.....................................4.5/8 ohms

center................................................4.5/8 ohms

surround............................................3.8/6 ohms

All of the response curves in the graph are

weighted to reﬂect how sound arrives at a

listener's ears with normal speaker placement.

The 4200 LR left/right front and 4200 C center

speakers had virtually identical on-axis response,

with curious roughness above 1 kHz. The 4200

LR had extremely uniform off-axis response,

while the 4200 C had some lobing at 30° and

wider listening angles. The Boundary-On switch

position cut output below 270 Hz by 3 dB for the

4200 C and half that amount for the 4200 LR.

The HF Energy switch cut output by 1 dB above

5 kHz when set to the Reverberant position and

boosted it by 1 dB in the Damped Room posi-

tion. The 4200 SR had the classic relatively

smooth but limited bandwidth response often

seen with bipolar speakers. Measured directly

on-axis in the Dipole setting, it had a 30-dB deep

null that began at 150 Hz and extended to 8 kHz.

I measured bass limits for the 641 SB

subwoofer with it set to maximum bandwidth

and placed in the optimal corner of a 7,500-

cubic-foot room. In a smaller room users can

S&V

in the lab

Bass limits (lowest frequency and maximum

SPL with limit of 10% distortion at 2 meters in a

large room)

front left/right .......................80 Hz at 86 dB SPL

center ..................................80 Hz at 84 dB SPL

surround..............................80 Hz at 73 dB SPL

subwoofer ..........................20 Hz at 79 dB SPL

103 dB average SPL from 25 to 62 Hz

105 dB maximum SPL at 62 Hz

expect 2 to 3 Hz deeper extension and up to 3

dB higher sound-pressure level (SPL). The sub

had an impressively uniform power delivery

across its bandwidth, delivering 100 dB SPL or

greater at every frequency from 25 Hz on up. In

the crossover-bypass setting, its frequency

response extended to nearly 200 Hz. Because

of a malfunction in my sample, I was unable to

test the variable crossover.

front left/right

center

surround

subwoofer

–5

–10

–15

100

hertz

bandwidth uniformity 98%

— Tom Nousaine

90 Hz to 19 kHz ±3.4 dB

90 Hz to 19 kHz ±3.7 dB

200 Hz to 15.4 kHz ±4.0 dB

29 Hz to 196 Hz ±4.7 dB

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