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You can also use passive filters to block low frequencies from the bookshelf speakers. You can get them in 80hz or 100hz. Put one of these behind each speaker connected to the speaker wires. Cheap solution if you don't want to get into active crossovers.
https://www.parts-express.com/100-hz-high-pass-8-ohm-crossover--266-462
These can work, but it depends on the impedance of the speakers. Best to check with us first @sophie smith if you're considering going down this path (once you know which speakers you'll be using).
For example, if you went with the Focal 906 and wanted to use Parts Express' 4Ohm 80Hz crossover, this is the effect it would have on the frequency response of the speakers:
And impedance:
So that would give you a big response peak at 85Hz, and put a lot of additional strain on your amplifier.