Waldo Pepper;574085 Wrote: > Well 23 years in the audio business working and designing top of the > range audio desks and having done many tests on such devices gives me a > bit of an edge. > > What's your qualification in such matters? > > We hear on a Logarithmic scale. We have had Log pots in radios since > they were commercially available. The SB Touch is linear.
Well for a start, I know how it's supposed to work. A fixed-track pot/fader and an accelerated rotary encoder are fundamentally different things. The fact is that the vol control encoder response is accelerated, so the faster you turn it the bigger the vol increase/decrease. This point alone renders the real-world (ie in-use as perceived by the user) response curve neither log or lin in the traditional sense, since for a given rotational angle on a trad pot the response will always vary by a set (log or lin) amount, whereas a rotary encoder's effect for a given rotational angle varies according to the speed of rotation... Secondly, each individual step between 0-100 is in fact a shift of +0.5dB... not percentages, but decibels... you know, the logarithmic ones... So, the unaccelerated response is linear on a log/lin (ie dB to SB volume reading value) scale. If you want to turn it loudly quickly, turn the knob quickly. If you want very precise control over the lower volume range - which is CRITICAL for the bedside radio use-case, turn it slowly. This is almost impossible to do with a conventional log pot as it lacks the necessary resolution at the lower end (unless you get one of the special taper variants). With regard to unaccelerated volume the SB behaves exactly like a precision 0.5dB stepped attenuator... or indeed like my $10k pre-amp... This was hammered to death in Beta testing for both Boom and Radio. The Boom and Radio curves are slightly different from the other SB's IIRC. If you turn the knob quickly enough you can go from muted to full volume in exactly 2 180 degree "twists" of the encoder. IF you want more detail, look here: http://forums.slimdevices.com/showpost.php?p=366853&postcount=12 -- Phil Leigh You want to see the signal path BEFORE it gets onto a CD/vinyl...it ain't what you'd call minimal... Touch(wired/XP) - TACT 2.2X (Linear PSU) + Good Vibrations S/W - MF Triplethreat(Audiocom full mods) - Linn 5103 - Aktiv 5.1 system (6x LK140's, ESPEK/TRIKAN/KATAN/SEIZMIK 10.5), Pekin Tuner, Townsend Supertweeters, Blue Jeans Digital,Kimber Speaker & Chord Interconnect cables Kitchen Boom, Outdoors: SB Radio, Harmony One remote for everything. ------------------------------------------------------------------------ Phil Leigh's Profile: http://forums.slimdevices.com/member.php?userid=85 View this thread: http://forums.slimdevices.com/showthread.php?t=81650 _______________________________________________ Radio mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/radio
