JBL LSR310S Underpowered, but I have a Work Around
Sweetwater Rep, Please replace the Review that I submitted yesterday (4/18), as I judged this product unfairly, and have found that it can be acceptable under the right conditions.
I have the JBL LSR305s, and while they are a good value for the money, the matching LSR310S subwoofer is NOT. Unless I received a lemon, which I don't believe that I have, this sub puts out very little sound in relation to the LSR305s because it is VERY underpowered. I bought it when it went on sale at a $100 discount, and I can understand why JBL was trying to clear them out! They're so underpowered that at first I could hear almost NOTHING at the 80Hz setting and had to use the extended low frequency to get any audible sound. I actually had to get on the floor and put my head in front of the sub to hear it! I am using Mogami Gold XLR cables and all of the connections and switch settings are correct and matched to the LSR305s in accordance with JBL's instructions. I was about to source an inline power booster to try to get sound out of this sub, when it occurred to me that, yes, the sub is underpowered, but MAYBE I could boost the source and work around this limitation. I discovered that if I reduced the volume (A LOT!) on the JBL LSR305s, and turned up the source, a Roland Quad Capture connected to my laptop PC, and THEN had the sub set at its highest volume level, I could get acceptable volume for a small room. Therefore, my disappointment with this sub stands, because it IS VERY UNDERPOWERED, but it is acceptable if you listen at low to moderate volume levels and use the work around that I just mentioned. Of course, if mounted at ear level you can get more volume, so for some out there that may be helpful. Overall, this is the most disappointing product I've ever received from the JBL brand due to its lack of amplifier power. The LSR305's are a good value, and I recommend them, but this sub doesn't have the power to let you hear the bass unless you REALLY turn up the source and cut the volume on the LSR305s. The sub’s speaker may be capable of high SPL levels, but you won’t get that out of the low-powered amplifier that comes with this unit. It may do the job in a small room, but it is not a good buy. BTW, these things are about as big as sofa end tables, and they have a large, flat, top surface, so if you buy one you WILL HAVE a place to set those ‘Teach Yourself DAW Software’ manuals.