In that case your budget is way too low. The big sound mainly come from 80 to 2.5 KHz and especially from 80 to 500 HZ. You have a sub in any case for the last two octaves. What you really want is that good mid band response. The KEF leads in that department. If you want bass extension from the towers, then there will be more than one bass driver. The speaker will then be 4 ohm even if the manufacturer claims 8, and then your receiver will struggle. In addition you will need to buy a much more expensive set of speakers to get a good mid band response and bass extension.\n\n58 hz does seem a little bit high doesn't it? Wouldn't he want to use a 120 hz crossover then? My bookshelf speakers dig deeper than that.