Welcome to Ask the Expert. Today, we have a few more questions on bass ports. We’ve already talked a lot about ports on Ask the Expert, but the questions keep popping up. We actually have a few people asking questions here, so I'll tackle a few of them. First of all, Paul. Paul is asking: “My speakers are placed symmetrically in my room, but my room is asymmetric with more bass reinforcement on the left side. If I plug only the left speaker port, I get a more balanced bass output. However, doesn't the plugged speaker become less efficient than a ported speaker causing a mismatch in the rest of the frequencies? I really like that question. That's a very interesting question. Quite shortly the answer is ‘No’. The loud speaker does not become less efficient. What happens is, you are lowering the bass output specifically in the area where the port is working. And that is typically 200Hz and below. So if you look at a frequency response from the loudspeaker, it will be exactly the same above the working area of the port. So basically 200Hz and up, there is no difference. So your speakers will sound the same. And 200Hz and below, that's where the room has the most influence. So that's exactly where you want to correct things. So you're basically making a 'poor man's' room correction by correcting the output of one of the speakers, by plugging the port so that it matches better with the other speakers. In the end, if the speakers are more balanced from doing that, that is a good thing. And that's exactly what you should do. And you could argue that if it sounds better, it is better. So if that makes them more equal in your room, that is definitely what you should do. And there is no real downside to that. Kind of related to this, we have a question from Tom. Tom has a lot of different information, but the most interesting question here is ‘How about using only one plug at a time? Does that present any problem for the amplifier?’ It's a similar question. If I only plug one port, what happens with the relationship of the amplifier? And the answer is basically the same: it doesn't actually make any difference to the amplifier, because your amplifier has a channel for each loudspeaker. So one channel doesn't really know what the other channel is doing. So it doesn't matter that it's a different load that the amplifier is seeing. So the the impedance curve on the loudspeaker will be different from each of the loudspeakers, but that doesn't matter because they are separate channels. In a related note, you could argue that the sealed box will actually be a simpler load to the amplifier. The impedance curve will be simpler, so it's actually easier to drive. But like I said, it doesn't actually matter in the end. So, to summarise: it’s not really a problem for the amplifier if it works better in your room to do that, definitely that's what you should do.