The rear terminal plate of the AT-40 includes high-frequency and mid-frequency attenuation switches or dials (depending on the exact production year). This allows users to manually adjust the output of the tweeter and midrange to match the acoustics of the room or compensate for overly bright source audio.
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The AT series generally offers deeper bass extension and higher power handling than the earlier "D" series at comparable woofer sizes. The AT-40, specifically, outperforms the D-5 in both low-end reach (32 Hz vs. 39 Hz) and power capacity. cerwin vega at-40 specs
30 Hz – 22 kHz (Note: The low-end reach is notable, delivering deep bass). Power Handling: 125 Watts RMS / 250 Watts Peak.
: With a sensitivity rating of 95 dB, these speakers translate even a minimal 1-watt input into prominent acoustic volume. They can scale up flawlessly during dynamic musical peaks without compressing the sound or sounding strained. The rear terminal plate of the AT-40 includes
Takeaway : Expect punchy, impactful bass down to 32 Hz. That’s deep enough for most rock, electronic, and home theater content, though pipe organ enthusiasts may want a subwoofer.
I have found some specifications and details from various sources: The AT-40, specifically, outperforms the D-5 in both
How to use them effectively
What those specs mean in practice