I have owned this subwoofer for 4 months and I couldn't have been happier. I can't say anything negative about this subwoofer. There are many great thing about this subwoofer. 1. It works well in a compact box. I have it in a 1.0cu ft sealed Sonic sub box stuffed with polyfill. Unlike many car subwoofers, this one is actually optimized to work in reasonably small sealed boxes (1 to 1.5 cu ft). WinISD recommends 1.2cu ft when running in 4ohm mode and 1.7 cu ft in 2 ohm mode. I run it in 2ohm mode, in effectively a 1.25cu ft box (due to polyfill), with resulting qtc of about 0.76, which is almost perfect. 2. Good sensitivity and power handling. Don't worry if you have a modest amplifier. This subwoofer can still get very loud when running off a 250watt RMS power, much louder than is actually necessary IMO. However, should you want to play it a little too loud, I don't see why you could power it with 500w amplifier. Harman Kardon is being obviously modest with subs power rating. The xmax figure alone suggests that this Kappa should take up to around 500watts while still operating in its "SQ" range. 3. The cone looks great. 4. Low Inductance. Most subwoofers have such high inductance that their manufacturers do not even report it. This sub has Le of around 1.18mH which is considered much better than average. Low inductance is generally good for transient response and blending with the front stage. 4. Great sound. Let's finally get to the core of the review. This subwoofer plays very cleanly and transparently. What I hear is a very clean, robust bass with a good texture. It's good for practically any music genre. Midbass output is higher and cleaner than that of an average car sub, which makes blending with the fronts much easier. Don't be afraid to bump your crossover frequency a little higher. (I have mine at 70Hz, up from 60Hz with previous sub). I could go on to continue building a list of things that this subwoofer does correctly, however, I think it would be much easier to say that it does nothing wrong IMO. Based on what I have heard so far, most Harman Kardon (owner of JBL and Infinity) subwoofers are very good performers, and this subwoofer is a proof of it. I feel like I have been converted. Should I look for a higher end sub in future, once I become rich and famous, I will probably pick up a JBL WGTI from the same company.
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