The input impedance of the DD-12's line-level rca inputs doesn't appear to be specified anywhere. The SLP-05's output impedance rises substantially at deep bass frequencies, to 3400 ohms at 20Hz, as indicated in Stereophile's review. The concern that raises is that if the sub's input impedance is not high (e.g. 30K or more), the sub's deep bass response will be perceptibly rolled off. The best approach, which would eliminate that concern, would be to connect your power amplifier outputs to the sub's speaker-level inputs. You don't need heavy gauge high quality speaker cables to do that, since what you would be driving is the input to the sub's amplifier, which undoubtedly draws a negligible amount of current compared to a speaker. Regards, -- Al |
Almarg, Just being notice of this! My Sim audio Titan (5ch) power amp has an input impedance of 25K, according to what you said, is that causing my speaker rolling off the bass significantly? If yes, does it mean a high input impedance good quality amp will have a great improvement? Any suggestion? Besides, do I need to biwire it back to from sub to poweramp according to some threads? |
