The Quad 988 has adaquate bass if the right amp is used with them. I am not familiar with the amps you have. So, I can't comment if it is right for the 988. Adding a subwoofer to the 988 is like mixing a bottle of fine wine with a bottle of coke, just because you think the wine doesn't taste sweet. The quad speaker is one of the very best speaker ever made. They are full of details and information and have very adequate natural and accurate bass, provided you have the right amplifier for them. When I said the bass is natural and accurate because there is no box to create the kind of bass you think that is "there". I go to live classical concert all the time. What I hear in a well performed piece of music is not "extended in both ends" like so many of us look for in music playback. I didn't hear any over emphasis of bass and treble. When the brass or violins played, I don't hear any ear-piercing highs or when the 10 double bass come in, I don't hear the any earth moving low-end extension. What I hear is music in unison and in harmony. The quad speakers are one of the most natural and real music reproduction speakers ever made. So many of us audiophiles nowadays chase after something that we think is real music, but instead we are really hearing something that is very un-natural and fake. So, don't ruin the very fine bottle of wine you have. I hope I didn't sound like I am preaching. Hope this helps a little.
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