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For this review, I loaded the CX120 into a 7 liters sealed box. This is the same box that I used for the Swallow-BC. My intention is for the CX120 to handle the midrange and treble while the bass will be one of my 8″ woofers. The first order of things is to see what the frequency responses are for the woofer and the concentric tweeter.
Fig 1 is the RAW response of the CX120 woofer in a sealed box. She is not as flat as I would like her to be. At 1.5kHz, there is a +5dB bump. That’s enough for her to affect the music. Higher up at 7.5kHz, a sharp peak is recorded. At about 12kHz, the woofer dies off.
The Toneburst plot in Fig 2 is interesting. It shows a bunch of unwanted energy from 6kHz ~ 10kHz (light blue slices). These are from the cone breakup. Looks like I’ll have to cross below 6kHz if I want to avoid them.
Fig 3 is the CX120 tweeter’s response. This does not look anything like in Dayton’s spec sheet. She looks more like a response from a horn.
Fig 4 shows the relative loudness of the CX120 woofer and tweeter. Once I flatten the tweeter, I don’t think I’ll need to attenuate her much after that.
In Dayton’s datasheet, the CX120 tweeter is fairly flat (Grey plot). My measurement in Fig 3 looks completely different. Because of this discrepancy, I would advise owners of the CX120 to make their own measurements before working on the crossover. |
June 25, 2023Drivers Thiele & Small, HIFI DRIVERS
Fig 1 – CX120 Woofer RAW Frq Response • Baffle Width = 8″
Fig 2 – CX120 woofer Toneburst Energy Storage
Fig 4 – CX120 Woofer and Tweeter Response
Fig 5 – Dayton’s Frq Response.