No, being the inverse of a horn, it's delay is limited to its 3rd harmonic dip which is acoustically 1 WL away from its tuning (Fp), so in the case of a 25 Hz tuning this puts the notch around 100 Hz or a ~ -0.8 ms and once damped would have as little as near zero delay, putting them ~ on a par with an infinite baffle (IB) except in a whole lot less bulk.

GM