First let's establish what you are looking for -
- Stereo or Surround Sound? Stereo returns higher value, but you have enough budget for Surround Speakers.
- Are you looking for JUST a pair of Front Speaker (Left/Right)?
- Do you plan to replace your amp and is that included in the budget?
- Can you itemize the equipment in your current system? Source Players? Amp/Receiver? All Speakers? Other?
Given that you bought the existing amp second hand, it is possible it is out of date relative to new AV Receivers.
Generally it is advised that the Three Front Speakers (Left/Center/Right)
be tonally matched, and the easiest way to do that is with speakers from the same Brand and Series. For example, Monitor Audio Silver Front and Center.
24ft x 25ft x 15ft, seems logical, but can we assume 15ft is the floor to ceiling dimension?
Curious, you sit EIGHTEEN FEET
away from the system? How big is your TV? Can we assume a projection screen? Still, it is what it is.
There are two aspects that have to be satisfied, one is sound at the seating distance, and the other is sound in the entire space.
I have a room that is 16ft x 35ft (open floor-plan)
, I frequently sit 25 feet away for my speakers which are 2x8" each, and have no problem reaching casual listening volumes for music (~75db to 80db).
I would expect reasonable results with similar speakers in your space.
Next to efficiency is the actual size of the speakers, in my case 2x8" each. Most speakers with larger drivers push more air and have more weight and impact within a given space. They don't throw Rock Concerts with a pair of 5" bookshelf speakers. So the sense of scale and the ability to move air in a large space matters.
The Klipsch Forte-III
have a 12" Bass driver, and in back have a 15" Passive Radiator. The Klipsch RF-7-III
have TWO 10" Bass Drivers. These have no problem filling space -
Generally if you want to fill a big space, you get very high efficiency (high Sensitivity rating)
Speakers, typically with 90db or more rated Sensitivity. I think the recommended Klipsch Forte-III
are very close to 100db Sensitivity. Keep in mind for each 3db shift in Rated Sensitivity in either direction, the power Doubles or Halves. So, relative to a 90db speaker, which is up there, and 99db speaker requires 1/8th the amount of power to reach a given volume.
Keep in mind, as can be seen from the example above, Power and Volume are not Linear. That is, huge changes in power only cause small changes in Volume. Others are free to correct me, but I think it takes TEN TIMES the power to double the volume. +3db doubles the power but is only a slight increase in the volume. But that doesn't change the fact that something like the FORTE-III
takes 1/8th the power to reach a given volume level relative to a generally high efficiency 90db speaker.
Then there is the aesthetic aspect. How does your wife feel about Black speakers? If she doesn't like the current Cherry, then was does she like? Keep in mind today it is possible to get White speakers. Klipsch are typically Black, Cherry, or Walnut.
So ... Big High Sensitivity Speaker are what you are looking for. Though I suspect if you Amp/Receiver is 10 or 15 years old, it is long out of date relative to modern AV Receivers.