Systems ListChase Home TheaterVS18.1

Measurement Details

AmplifierClosed Loop
Outside Temperature81 F
Date TestedAug 11, 2012
Tuning Freq. Of Test19 Hz
Settings & Equalization
  • Power set to the "On" position
  • Delay/Phase set to 0
  • Crossover set to the "Off" position
  • Level set to 12 o'clock
  • HPF set to the lowest setting


 Looking at the response of the Sub1 amplifier itself indicates that the low pass filter settings correspond well with the indications on the dial. The high pass or rumble filter did not exhibit as much adjustment as I expected and produced a moderate boost when set to its maximum 35Hz level. The second half of the adjustable range appeared to offer little change in the roll off or shape. With the high pass at minimum the effective -3dB point is about 16Hz. At maximum it is at roughly 21Hz. With the VS18.1 cabinet it is probably best to leave it at it's minimum setting for maximum extension. With the Sub1 amplifier wide open its response is about -3dB down at 16Hz and 230Hz. Used with the Sub1 set to its widest frequency response the VS18.1 + Sub1 amplifier combo produce a frequency response that fits within a 6dB window from 25-240Hz. There is a shallow roll off starting at about 40Hz that increases as the rumble filter kicks in near 20Hz that should compliment room gain well. Looking at the long term output compression tests this combo produces clean increases in level with little compression up to and through the 115dB nominal level after which the Sub1 goes into limiting as evidenced in the 118dB measurement where there was actually a small loss in output above 30Hz. Just as well. The Sub1 amplifier combined with the VS18.1 cab result in a good match with the amplifier running into the limiter at about the point where the driver is running out of useful excursion in the deep bass anyway. The high pass filter seems to match up well too, with the system free from any objectionable noises unless heavily driven below tuning where the driver will make some over excursion noise. Port noise was not an issue with this combo even at full tilt levels right near port tuning. The driver is stated at having an xmax of about 19mm one way. During testing this seems about right maybe slightly less but the xmech of the driver follows very quickly and may not be more than 20mm itself. The surround seems to be the limiting factor with this driver. It is clean up to a point where it starts making doubling noises indicating that it is out of stroke. It is a rather abrupt transition into an over driven state but the driver itself seems to be rugged and the soft bottom suspension design means that it will indicate that it is over driven with this noise rather than physically damaging itself unless dramatically overpowered. This is a good design choice. The CEA-2010 burst output data indicate that this system is well matched with the Sub1 and show that this system has a good bit of output for the money and produces useful and strong output down to 16Hz. In room it should be powerful to that point if not a little lower depending on the room acoustics. The distortion data is also good with less than 10% up to the point that the amplifier runs into the limiter over the subs entire useful range. Distortion does rise below the vent tuning but this is normal for any vented speaker. The group delay measurement shows good behavior until down into the tuning range where the vent combined with the high pass filter increase the delay. Still it is well below 1 cycle and should have no audible consequence. Overall a solid performance. 

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