Shuttle 6.2 vs 6.0

[DingoBlues]

There's a good explanation from agedhorse about the HPF on the shuttle 6.0 here:

http://www.talkbass.com/forum/f15/g...-advise-needed-694819/index2.html#post9719343


The LF Boost extends the lower range of the HPF but doesn't disengage it. As I understand it all the GB amps use an HPF to improve efficiency and prevent speaker damage. The one on the 6.0 was set a little higher to work with the compact shuttle cabs. Here's another good read:

http://www.talkbass.com/forum/f15/gb-shuttle-6-0-questions-587588/#post8109377


Rest assured there's no lack of low end with NeoX 112's and the LF boost/extend engaged.

 

[agedhorse]

This is a good explanation IMO.

As I understand it the biggest two changes to the 6.2 as compared to the 6.0 are the increased preamp gain form 12:00 up to allow for more overdrive if so desired and the change to the HPF in the power section. I believe the 6.2 will have the addition of the 3DPM and Phat and maybe the subtle tweaks to the Shape Controls but those are very esoteric in tonal change IMO though I have not played the 6.2.

The original 9.0 already had the updated HPF so the differences between the 9.0 and 9.2 are even more subtle. The low end is almost identical on the 9.0 and 9.2 with the difference being in the 3DPM and and the slight tweaks in the Shape Controls. I have not played the 9.2 but I did do an independent AB comparison of the power sections of the Streamliner 900 (which has the updated HPF, 3DPM and the PHAT) and the 9.0 (which has the updated HPF and PHAT, with no 3DPM). I AB'ed the two power sections using a Summit Audio TD-100 instead of using either Genz preamp. The difference was very minimal. The low end was a little rounder/smoother on the Streamliner power section than the 9.0 and that was with both power sections cranked into two identical cabs.

The Graphics are different as well.

I'm sure Aged Horse will be along shortly to further clarify.

Not sure if this will help but in the first couple pages you can read about the differences between the 9.0 and 9.2 here in this thread. http://www.talkbass.com/forum/f15/g...n-thread-part-ii-shuttle-9-2-included-857523/

Note The PHAT may only be in the 9.0 and 9.2 as this may be to keep the 9.0's power amp cooler to squeeze out more power. I'm not sure.

 

[Jim Carr]

If I may, I am quoting here from one of agedhorse's posts from the Shuttle 6.0 thread referenced earlier, as I think it explains what I have noticed as a user of the 6.0:

...The [Shuttle 6.0] "LF Boost" circuit comes from the original tone shaping filters on the GBE-750 and 1200. On these products they are called "LF Extend." That seemed to cause some confusion so when we introduced the Shuttles it was suggested by some players that it would be simpler to understand if it was just called a "LF Boost" circuit instead...

With the switch out, the high pass filter is set slightly higher, which really helps when driving anybody's (not just ours) sub-compact speaker cabinets hard. It tightens things up and helps prevent damaging overexcursion as the LF driver unloads at low frequencies. If you have a larger cabinet that maintains LF driver loading at lower frequencies, pushing the switch in slides the high pass (low cut) filter down. This is the more flat response position. There is a little more going on behind the scenes, but this is the important stuff.

This might also be part of the reason why a few folks feel that the Shuttles [6.0] are not as deep on the low end... the LF Boost (Extend) switch must be engaged to get the full low frequency response of the amp.

Hope this helps.