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SVS’s “Ultra” lineup of subwoofers represents their top of the line models. Their SB13-Ultra (SB standing for “Sealed Box”) is the subject of this review. Some have questioned why the SB13-Plus was discontinued and it appears that SVS simply changed the box aesthetic and renamed it an “Ultra”. I asked Ed Mullen, Director – Technology and Customer Relations for SVSound, and he responded
”While the SB13-Ultra hardware is indeed similar to the SB13-Plus, we have made a several key revisions which are noteworthy and improve the overall performance, functionality, and value of the SB13-Ultra, making it a worthy successor and a better product in every way than the SB13-Plus:
- The driver soft parts have been revised to improve the T/S parameters. We are not releasing specifics on this though - the changes are proprietary.
[*] The DSP flash file (EQ and limiter/compressor algorithms) was revised for even more linearity, accuracy and better behavior at the limits.
[*] The cabinet volume is slightly higher due to the removal of the side panels, and this contributes to improved deep bass efficiency and deeper extension (quasi-anechoic F6 is now a legitimate 20 Hz).
[*] The grille retention system was improved to a pin/cup arrangement. This works better than the previous version, which was prone to slipping at high playback levels.
[*] The finish is now a premium 6-sided piano gloss or black oak veneer to match the PB13-Ultra.”
Given that they also have not really increased the price of the SB13-Ultra, this sounds good to me.
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