However, as stated earlier, there is no free lunch. The speaker with the lower impedance will always sound louder when directly compared to one with higher impedance, so this is often a way that manufacturers can gain some advantage in such comparisons. All other things being equal, higher impedance is a good thing. For a given voltage from the amplifier, a lower impedance will result in a higher current draw and more power being delivered form the amplifier to the speaker. Speaker impedance is an indication of how much power will be drawn from the amplifier. What we do attempt in our designs is to give the bookshelf speakers almost the same bass extension as the floorstanders, so that you are still able to hear most of your music, just at a lower maximum volume level. So, do we need all of the gains that the floorstander can give us? This will depend upon musical tastes, how loud you like to listen, how big is your listening space, how far away from the speaker you listen, and how powerful your amplifier is. We can have somewhat higher efficiency, or better bass response and more bass output. Obviously for a floor stander we have greater cabinet volume along with the capability of accommodating either larger drivers or multiple smaller drivers, so the limitations of the bookshelf are largely overcome. If we therefore limit the size of box, as in a bookshelf speaker, we must give up efficiency or bass response. One cannot have bass extension, high efficiency and a small box. Secondly there is a relationship between the cabinet size, the low frequency extension and the efficiency that is attainable, governed by the pesky laws of physics. To reproduce low frequencies, we need to move a lot of air. Typically, bookshelf speakers have limited bass output, both in terms of frequency extension and bass dynamic capability.Ĭlearly, the small size of a bookshelf limits the size of bass driver that can be accommodated and so limits how much air the driver can move. ![]() First let me say that the answer is applicable to both movies and home theater. There is no simple answer because it depends on your associated equipment and the listening environment. It can be a long involved process, but is worth it in the long term. Listening to some music with good, consistent bass that explores the full range of the bass frequencies, and then keep moving the speakers inch by inch and listening for the most even reproduction of each bass note. Start by placing the speakers about 10’ apart, listen around 12’ away, keep the speakers around 3’ from rear and side walls, listen around 2/3rds of the way down the room, then just keep experimenting. The simple answer is that there is no simple solution. Listening dead center in the room will likely give you a big null in the bass at some frequencies and result in uneven reproduction of bass notes. Location the listening seat will give you more bass, and maybe too muchģ. Putting the speakers closer to walls and corners will give you more bass, and quite possibly too much bassĢ. Very few rooms are of a regular shape, and added to that are the different acoustic properties of the walls, the floor, the windows and of openings into other rooms, that blanket rules are largely wishful thinking.ġ. This however in practice is just so limiting. ![]() There have been some attempts to give rules of placement, such as the rule of thirds. It is so dependent upon the particular circumstances of your listening room. The $64,000 question! This is so difficult to answer with any certainty.
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