Various spectroscopic benzene detectors have achieved detection limits down to ppb-levels. However, many use the strong absorption band at the wavelength of approximately 3 µm for detection, which has significant overlap with many other organic compounds, most notably other simple aromatic combounds, e.g. toluene and xylenes. These are common interferents in benzene measurements and the requirement to properly account for their presence can degrade the performance of the detector substantially. Another strong absorption band at 14.8 µm has also been used for ppb-level benzene detection, but previously a long preconcentration time of 40 min was required for single digit ppb measurements. In our previous publication, we were able to reach a sub-ppb detection limit without preconcentration, but only with a long averaging times of approximately 20 min. The high sensitivity was reached using cantileverenhanced photoacoustic spectroscopy (CEPAS) for detection. In CEPAS, the photoacoustic signal is recorded with an optically-read cantilever microphone, which leads to increased sensitivity compared to conventional diaphragm microphones. The technique has been used to reach sub-ppb detection limits for various trace gasses. In this article, we have significantly enhanced the detection limit of our previous spectrometer with sample enrichment using a Tenax TA sorbent for preconcentration. Sorbent based preconcentration couples well with CEPAS, because CEPAS allows highly sensitive measurements even with a small sample volume. When limited gas volume is used for desorption, the spectroscopic measurement can be performed from a highly enriched sample volume. The CEPAS measurement is not done from a continuous flow, but instead the CEPAS cell is closed during a spectroscopic measurement. This makes the setup time efficient, because once the enriched sample has been transported into the CEPAS cell, the spectroscopic measurement can be performed in parallel to the collection of the subsequent sample into the sorbent. The measurement averaging time can be matched to the adsorption time to optimize the sensitivity. Using short adsorption times, we are able to reach a detection limit well below 1 ppb with a 90 s sampling cycle.