QSC SC1120 Measurements Vs Klipsch Vs THX Speakers

Frequency Measurement Comparison of QSC SC1120 with Klipsch RF82 and Jamo D6 THX speakers.

In Room Measurements of QSC SC1120 vs Klipsch RF82 vs Jamo D6 LCR.

All SPL comparison.

Following images show the in-room measurements of QSC SC1120 with Klipsch RF82 and Jamo D6 LCR THX speakers.

QSC SC1120 Graph

Klipsch RF82 Graph

Jamo D6 LCR THX Graph

Finally A Comparison Graph

QSC SC1120 in-room frequency response below

QSC SC 1120 in room measurements response
Firstly, QSC SC 1120 All SPL Response Curve

Klipsch RF82 in-room frequency response

Secondly, Klipsch RF82 All SPL Response Curve

Jamo D6 LCR THX in-room frequency response

Lastly, Jamo D6 LCR THX All SPL Response Curve

Comparison measurements of QSC vs Klipsch vs a THX speaker

Finally A Comparison of QSC vs Klipsch vs Jamo THX

Does QSC SC1120 have a X Curve?

The most important purpose of the measurements was to ascertain if the QSC SC1120 has got a X Curve frequency response issue. For that reason different speakers were compared directly. Subsequently from the above graph it is evident that the screen channel QSC SC1120 speaker does not have any X-Curve issue. Accordingly it should be able to provide HF extension and fidelity.

Other Observations:

Klipsch F82s have a particularly peaking HF response curve.

Jamo D6 THX have a more or less flat response down till 200 hz.

QSC SC1120 have particularly good response in 80 to 180 hz.

Methodology and Equipment used:

Firstly internal sound card of a normal HP laptop was used and calibrated with Room EQ Wizard software (REW). Besides a Audyssey microphone captured the sounds from a distance of 16 feet, while the total dimensions of room are 16ft x 25ft x 8ft (WxLxH). Although identical volumes were used for Klipsch and QSC the Jamo was boosted an additional 5db. Lastly the graph has 1/12 smoothing applied.

Credits: Buy Guru

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This Post Has 2 Comments

  1. Barry Ferrell

    The QSC SC 1120 is intended to be used with QSC DSP processing such as the DCP or DPM cinema processors or Q-SYS networked DSP processing. The QSC processors provide a custom FIR filter to flatten the frequency response. A flat response from the speaker results in a close approximation to the X-Curve when the speaker is placed behind a perforated cinema screen. Room measurements in commercial cinemas are generally done with 4 mic multiplexing to average out some of the room modes. Barry Ferrell QSC, LLC

    1. buy.guru

      Thank You Barry, for the explanation and taking the time to write a comment.

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