therefore its bandwidth is not limited by $\omega_{ta}$. However, it still takes time to collect all of the ballistic athermal phonons rattling around in an absorber. In the SuperCDMS athermal phonon iZIP detector for example, this athermal-phonon collection bandwidth $\omega_{nt}$ = 210 Hz while $\omega_{S/N \, \delta \! P_{t}}$= 4 kHz for the 90 mK W TES that CDMS has historically used[@MCP_Thesis]. Thus, they pay a resolution penalty of 5$\times$ due to the bandwidth mismatch between their athermal phonon signal and their sensor bandwidth, completely analogous to the thermalized sensitivity suppression.

Other examples of sensitivity suppression due to poor signal /sensor bandwidth matching can be found in the new CRESST composite detectors (Fig. \[fig:Traces\_CRESST\_Composite\]) [@CRESSTII_2009_SplitDetector] as well as the AMORE MMC based calorimeters [@AMORE_2014]. In the CRESST composite detector, the athermal phonon signal from an event in the absorber crystal must first be transmitted across an epoxy glue joint between the absorber crystal and the substrate on which the TES is fabricated, yielding $\omega_{nt} \sim$7 hz (fall time $\sim$ 23 ms). If we associate the fall-time pole of the phonon signals for events hitting the TES chip substrate ($\sim$ 50 Hz) with $\omega_\mathit{eff}$ and we further recognize that $\omega_{S/N \, 