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Originally Posted by Big Andy  What model were you testing? My home studio is running 5 ADAM A-7s and a Sub 8 and I've never had a single issue with them. I actually find the low end as articulate as what is coming out of my tweeters. Granted, I just got this set less than a year ago. Perhaps they made some improvements. |
The subwoofer is what is fixing the problem for you. I originally noticed this with the A7's. Disconnect the subwoofer... start sending sine waves from a signal generator through them. Start at 100Hz and then go down... notice what starts to happen between 70Hz and 80Hz? and it continues down until the speaker can't reproduce sound anymore (I think they go down to around 40Hz if my memory serves me).
Putting a subwoofer in puts the crossover somewhere between 80 and 120 Hz depending on where you have it set... in that case the bottom end isn't being sent to the speaker so you don't hear this acoustic anomaly.
The P11 exhibits the same problems because it uses the same port design. While I didn't test them in depth, after finding the problem with the A7, I could hear the same problem in the P11 and the S2A at my dealer's showroom and on even on the NAMM show floor!
It is based on the size of the port and the internal volume of the cabinet. If the port is bigger, or there are two ports (like they've started doing on some models) or the size/shape of the cabinet is different (like they are doing with the SX series) then these problems might be less noticeable.
This is also why most manufacturers put the bass port on the back of the unit. If you stand behind the adam speaker you don't really notice this since it's a distortion of the air coming out of the port. It's also why companies like KRK, when using forward facing ports, DO NOT use round ports. Instead they use rectangular ports that are very wide and not very tall.