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fdecks HPF, Part II

#201
Downunderwonder said:
Weird. You're saying slab bass generated booming in the acoustic guitar, "cured" by phase flip, no amps. Where was the hpf in the chain?

The only way a phase flip of bass would change how the guitar reacted is if it was acting on PA OR monitor.

Acting on both would have zero effect. The instruments themselves were never in phase to start.
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Yup. Bass-hpf-di-pa.
 
#205
Downunderwonder said:
Makes no sense then. Perhaps Francis can enlighten us as to how the flip settled the guitar down. Are you sure you didn't tweak the filter at the same time?
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Makes perfect sense to me. Basses make acoustic guitars 'take off' with feedback all the time! It could be loud monitors, proximity to the pa subs, etc... Usually, one would count on the mix engineer isolating and cutting the offending frequency with eq. If that doesn't happen (for whatever reason), flipping a basses phase could very likely solve the problem, but likely with a resulting thin bass tone on stage. Either way, I'd rather have thin bass tone than run-away feedback every time I hit a certain note!

I actually had this problem at a gig this weekend. The mix engineer couldn't seem to find the right spot to cut as everytime I played a low A, the acoustic started rumbling. If I had my fdeck in line I might have been able to fix it.
 
#206
This phase thing is interesting. The cabs I'm now using roll off at 50Hz and I'm not really using the HPF much for on-stage sound. A couple of soundmen recently have liked what it does out front though so I'm keeping it in the chain. The phase flip sounds like another reason to have it.
 
#207
scotch said:
Makes perfect sense to me. Basses make acoustic guitars 'take off' with feedback all the time! It could be loud monitors, proximity to the pa subs, etc... Usually, one would count on the mix engineer isolating and cutting the offending frequency with eq. If that doesn't happen (for whatever reason), flipping a basses phase could very likely solve the problem, but likely with a resulting thin bass tone on stage. Either way, I'd rather have thin bass tone than run-away feedback every time I hit a certain note!

I actually had this problem at a gig this weekend. The mix engineer couldn't seem to find the right spot to cut as everytime I played a low A, the acoustic started rumbling. If I had my fdeck in line I might have been able to fix it.
Click to expand...
You haven't read what I wrote. I know the bass made the acoustic take off. The issue is that, as described, the change of phase makes no odds to the situation as they were never in phase in the beginning. The bass excites the acoustic in its own time.
 
#209
scotch said:
...
I actually had this problem at a gig this weekend. The mix engineer couldn't seem to find the right spot to cut as everytime I played a low A, the acoustic started rumbling. If I had my fdeck in line I might have been able to fix it.
Click to expand...

+1
Happened at my St. Paddy's Day gig and may happen again tonight for the Rugby 7's gig (same pub), but I think El Guitaro is bringing a different guitar tonight, one with built-in EQ. No sound guy, not good enough yet to afford one.

Downunderwonder, I understood what you meant, but I can't explain it. I'll defer to the experts/more experienced, I merely flip the switch and magic happens with no clue as to how/why.

I still need to get myself an HPF-Pre 3... *sigh*
 
#213
Just bought a series 3 and got to test it out today.
Really didn't notice much low end taken away until about 80hz or so.
It did tighten up my sound around 100hz.

V8XHzfs.jpg
 
#220
tallboybass said:
Question: My Series One chewed through an Energizer Alkaline in a month with basically 24-28 hours total use. Does that sound about right?
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I just did a quick analysis based on a datasheet for an Energizer battery. I'd expect somewhere around 40 to 80 hours of battery life, but...

I've gotten bad batches of batteries. Some time ago I did a comparison measurement of 9-V alkaline batteries and found that the drug store cheapies (if they start up fully topped off from the store) have the same life as name-brand.

Nothing beats data, so I'll have to set one up and chew through a battery while logging the voltage.
 

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