Their upper-frequency rolloff is initially clean, though some low-level resonant peaks are present between 500Hz and 900Hz. The output of the twin ports (fig.2, red trace) peaks slightly higher in frequency. With the 4329's low-frequency boundary compensation set to "Flat," the woofer's nearfield response (fig.2, blue trace) has its reflex notch, which is when the back pressure from the port resonance holds the cone stationary, at 30Hz. The JBL 4329 offers excellent dynamic range capability.įig.P, anechoic response on tweeter axis at 50", averaged across 30° horizontal window and corrected for microphone response, with the nearfield woofer (blue) and port (red) responses and their complex sum (black), respectively plotted below 300Hz, 1kHz, and 300Hz. When I repeated the measurement with the analog input sensitivity set to "+4dB," the spl dropped by 14dB, as anticipated. With the 4329P's balanced analog input fed MLSSA's single-ended pseudorandom-noise signal at 246mV peakpeak, the speaker's volume control again set to its maximum and its analog input sensitivity set to "≡0dB," the speaker produced an spl of 92.7dB(B) at 50". Sending white noise recorded at ≢0dBFS to the JBL speaker with Roon, with the volume control set to its maximum, gave an spl of 90dB(B) at 50". The USB Prober app identified the USB-connected speaker as "JBL 4329P" from "JBL" and revealed that the USB input operated in the optimal isochronous asynchronous mode. Apple's AudioMIDI utility indicated that the loudspeaker's USB input accepted 16- and 24-bit integer data sampled at all rates from 44.1kHz to 192kHz. However, it did allow the 4329P to be used as an Airplay device, which limits playback to 44.1kHz and a 16-bit word length. The Roon app's audio settings window indicated that the network-connected speaker had not yet been certified by Roon. I performed a factory reset and checked to see if a firmware update was available. The review sample was running firmware version 0100.1685.0x1010f. Before I started the testing, I connected the 4329P to my network router with an Ethernet cable and opened its local webpage. I used DRA Labs' MLSSA system with a calibrated DPA 4006 microphone to measure the behavior of one of the JBL 4329Ps in the farfield and an Earthworks QTC-40 mike for the nearfield responses.
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