Standard pure tone audiometry measures hearing thresholds up to 8 kHz. Recent studies have shown that speech information above 8kHz (”extended high frequencies”; EHFs) improves speech recognition. However, it is unclear whether the EHF benefit depends on the complexity of the speech stimuli. We investigated the added value of EHF information for speech recognition in noise for Dutch digits, words and sentences; and for speech recognition in quiet for words. Speech stimuli were presented at a fixed signal-to-noise ratio and listening conditions varied only based on available EHF information. The results confirmed findings from other studies and showed a significant benefit of EHF for speech recognition in normal hearing listeners. We have used an approximation of the Speech Intelligibility Index (SII) model to make a rough estimate of the amount of EHF speech information for the different speech materials used. Implications for the SII model and speech recognition tests will be discussed.