Cerwin Vega At40 Specs

The specs tell you it’s a 3-way, 91dB, 45Hz-20kHz monitor. But living with a restored pair reveals a speaker that loves to be played loud, stays composed under pressure, and respects the vocal track. If you find a dusty pair at a garage sale for under $200, grab them. Refresh the crossovers, oil the cabinets, and you’ll own a genuine piece of late-80s hi-fi that can still embarrass modern plastic boxes.

This is where early AT-40s differ from late models. The original spec calls for a 1" soft dome (similar to a Vifa or Audax design). Later units (post-1990) used a phenolic ring radiator—more efficient but slightly less detailed. The soft dome version is rarer and more desirable for hi-fi use. cerwin vega at40 specs

| Metric | CV AT-40 | Elac Debut 2.0 B6.2 | Klipsch RP-600M | | --- | --- | --- | --- | | Sensitivity | 91 dB | 87 dB | 94 dB | | Bass extension | 45 Hz | 44 Hz | 45 Hz | | Tweeter type | Soft dome | Soft dome | Titanium horn | | Midrange character | Forward, warm | Neutral, laid back | Aggressive, forward | | Power needed | 20-75W | 40-120W | 10-80W | The specs tell you it’s a 3-way, 91dB, 45Hz-20kHz monitor

The sealed-back 4" cone midrange is the unsung hero. Many CV speakers have a "hole" in the upper midrange due to crossing a large woofer directly to a horn. The AT-40 dedicates a driver to 600Hz–4.5kHz—the exact region of vocals, guitars, and snare drums. This gives the AT-40 a presence that cheaper CV speakers lack. Refresh the crossovers, oil the cabinets, and you’ll

Lab tests from the era (courtesy of Audio Magazine , Nov 1989) showed the AT-40 had a slight rise around 70Hz (+2 dB) due to the port tuning, then a remarkably flat midrange (±2 dB from 300Hz–3kHz), followed by a 3-4 dB roll-off above 15kHz. This makes them "warm and forward," not harsh. Part 2: Real-World Performance (Beyond the Spec Sheet) Specs don't tell the full story. Here’s how the AT-40 behaves in a room with modern gear. Bass Response The Claim: 45Hz. The Reality: Measurable output down to 42Hz, but with a steep drop below 50Hz. The rear-firing slot port requires at least 6 inches of space behind the speaker. Place them near a wall, and the bass jumps to a hearty 48Hz at usable levels. They won't shake your teeth, but for an 8" monitor, the kick drum has genuine thwack . Sensitivity & Amplifier Matching At 91dB @ 1W/1m, the AT-40 is efficient but not ultra-efficient . You don't need a 200-watt monoblock. A solid 30-50 watt vintage receiver (Pioneer SX-*50 series, Marantz 22xx) will drive them to deafening levels in a small room. However, they love current. A 75-watt high-current amplifier (like an Adcom GFA-535 or NAD 3020) produces tighter bass than a 100-watt budget receiver.