“Best Speakers Under $50k Series: Sound Lab G7-7C Review”

[HearYe]

Hello Chris,
Does the FRAB backplates (Full Range Auto Bias) take into consideration the recently disclosed distortions and sonic coloring as a result of unfilterd ripple on the Bias?

[WillB]

No AC power to charge the panels. Amazing.

[kilkil]

I agree no AC is amazing. Though are there disadvantages to this method besides waiting a few seconds after turning the amps on to charge the panel?

[ChrisSoundLab]

There are no disadvantages to our knowledge to using the FRAB backplates (Full Range Auto Bias).
In fact there are advantages – some obvious ones which is why ‘amazing’ is a good catch-all term. (convenience, saving cost on power chords, location of AC outlets, FRAB can be used worldwide irrespective of country’s standard voltage) – the power taken from audio signal means it is ‘cleaned’ thru any power conditioning already being used to feed your amplifier (if there were any concerns on that issue anyway) and panel backplates are grounded thru the amplifiers ground. Roger has been using a version of this for over 3 years until I discovered it on a recent visit to him and asked him why he hadn’t introduced this earlier…too many other things to do and just didn’t think of it…..I guess better late than never! Happy to answer any more questions or concerns.

[Sliderule768]

Very interesting review. Having had my 745’s for over a year one of the things I have noticed is the speakers are very sensitive to level – they seem to become totally transparent at a certain loudness level. I might be prejuiced. <G>

[MikeB]

I just noticed that the following Sound Lab review was posted today (7/15/25):

An Absolute Sound Review by Tom Martin Jul 15, 2025: “Best Speakers Under $50k Series: Sound Lab G7-7C Review”

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