8/9/2023 0 Comments Atc scm11 black![]() ![]() Fig.3, which shows the individual responses of the woofer (blue trace) and tweeter (red), confirms that the speaker's bass output is ≦dB at 53Hz. The peak of 52 ohms at 53Hz in the impedance plot suggests that this is the tuning frequency for the SCM 11's woofer, which will be the frequency at which the response lies 6dB down from the midband reference. As I've written before, all things being equal, a sealed-box design will give a more extended low-frequency performance in-room than a reflex (ported) design, due to the former's slower rolloff below resonance: 12dB/octave rather than 24dB/octave. The SCM 11 is somewhat unusual in having for its woofer a sealed-box alignment. It's possible that these modes are high enough in frequency to have no subjective consequencesJM certainly didn't remark on any midrange congestion that might have been laid at the door of this behavior.įig.2 ATC SCM 11, cumulative spectral-decay plot calculated from output of accelerometer fastened to center of side panel (MLS driving voltage to speaker, 7.55V measurement bandwidth, 2kHz). There is a slight discontinuity between 500 and 600Hz in the impedance-magnitude trace, and an investigation of the enclosure panels' vibrational behavior with an accelerometer did uncover two fairly strong resonant modes on the sidewall in this region (fig.2). Though there is a rather demanding combination of 5.5 ohms magnitude and ≤2° electrical phase angle at 3.3kHz, this shouldn't overtax well-designed amplifiers.įig.1 ATC SCM 11, electrical impedance (solid) and phase (dashed). This was probably owing to the fact that the SCM 11's impedance remains above 8 ohms for most of the audioband, with a dip to 6 ohms between 100 and 300Hz, and to 4.8 ohms in the mid-treble (fig.1). I estimated the ATC's sensitivity as being a low 82dB(B)/2.83V/mthis speaker should work best with higher-power amplifiers, though I note that JM had no drive difficulties with the Arcam Mini or Carat I57 receivers he used, and was impressed by the speaker's dynamic capabilities when he drove it with the Peachtree Nova. we can facilitate packaging & shipping from anywhere in the country.The SCM 11's voltage sensitivity is specified as a fairly low 85.0dB/2.83V/m this seemed a touch optimistic, as the ATC didn't seem to play any louder than the sample of the BBC LS3/5a that I routinely include when I'm set up to measure a bunch of loudspeakers. Click here to get a quote for your gear now. Contactus to find out how easy it can be to get a quick, fair, cash price for your gently used gear. We have daily phone support at 720-33-MUSIC, and we are always paying cash for quality used gear. We also represent many fine brands such as Audeze, Crystal Cable, Micromega, Peachtree Audio, PS Audio, Quad, Rogers High Fidelity, Wharfedale, XLO Cables, Balanced Audio Technology. Click here to read more about the very conservative cosmetic rating scale we use:īuy / Sell / Trade / Consign - The Music Room is the Nation's premier seller of carefully selected, pre-owned audio equipment. Our 8/10 is what a lot of people might call "mint". Virtually nothing is a 10/10 unless it is nearly new and looks factory fresh. Note that All items valued over $500 will require a signature upon delivery.Ĭosmetic Ratings - we're often asked " why is your numerical rating so low when the product looks great?" We tend to be very conservative when applying a cosmetic "rating" to products. When factory packaging not available re-usable shipping box with custom injected-foam mold will be used. Items with factory packaging will be double boxed. ![]() For all other locations including Hawaii, Puerto Rico and Alaska, please request a quote prior to purchase. Shipping: Cost to ship this item within the Contiguous United States is a flat rate of $55 - including packaging and insurance. Remarkable frequency control, low-end texture presentation, and a flat impedance curve further separate this incredible musical instrument from its peers." Boasting an in-house-built dual-suspension 25mm soft-dome tweeter and in-house-made soft-dome midrange exclusive to ATC designs, SCM11 v2 delivers honest high-end resolution and coloration-free tones. Other Notes: "Offering big, spacious performance and sterling transparency, SCM11 v2 is distinguished by its effortlessly balanced, smooth sonics and microscopic detail retrieval. What is Included: One Pair of Speakers, Factory Packagingįunctional Notes: Operational condition of this item is excellent… fully tested and no issues found. Product: ATC SCM11 V2 Bookshelf Speakers Black PairĬosmetic Description: 9/10 Excellent condition with no notable blemishes. ![]()
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