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post #1 of 3 (permalink) Old 09-28-2009, 07:34 AM Thread Starter
 
Join Date: Apr 2009
Location: Great Falls, MT
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question about effects loop, and interesting theory

so, i have quite a few pedals. most of which are rather decent in the true bypass field. here is my chain

guitar-

zvex fuzz factory
535q wah
wh-1 whammy
keeley compresor
hbe compressor retro
rc booster
ac booster
bb preamp

-amp

effects send-

hbe psylicybe
hbe frostbite flanger
damage control timeline

-effects return

the two compressor pedals are for different styles. i use the hbe for subtle, sustainful compression, the keeley for country. anyways, i have been recently fighting for a perfect tone (or close to it) and got a 6 loop true bypass looper from loop master. obviously this helps big time with the wah and whammy. and for good measure i plugged the rest of the things that are in front of my amp into it as well. so here is my new effects chain

guitar-

loop master
loop 1 send-zvex fuzz factory-loop 1 return
loop 2 send-535q wah-loop 2 return
loop 3 send-wh1 whammy-loop 3 return
loop 4 send-keeley compressor-loop 4 return
loop 5 send-hbe compressor retro-loop 5 return
loop 6 send-rc booster - ac booster - bb preamp-loop 6 return

-amp

effects send-

hbe psylicybe
hbe frostbite flanger
damage control timeline

-effects return

now there is a huge difference in the sound, since there is no tone suckage coming from the pedals before the amp. they were good before, excluding the wah and whammy, but now they are amazing.

now my understanding is that the pedals in an amps effects loop shouldn't suck tone, because effects loops have a lower amount of signal required than the guitar intput on the amp (or something like that?). is this true? i have also heard of having a buffered effects loop on your amp. is that something that every effects loop should have?

and also, i think the theory of an effects loop is good sometimes, but completely contradicts itself other times. the whole idea is to put the modulation and timebased effects after the gain from the amp. so they put a send and return jack between the preamp and the power amp because in theory the gain and tone comes from the preamp tubes, and the volume comes from the power amp tubes and therefore the mod and time based effects have been put after the gain and tone in the amp.

well for me and many other people, the power amp plays a huge role in the tone and gain of my amp. i have a marshall 1987x reissue, and really the only way to get gain is from the power amp. therefore, the mod and timebased effects are not put after the gain stage of my amp. so is me putting these effects in the amps effects loop even serving a purpose? the whole theory just seems wrong

sorry for a long post. maybe it will spark lots of discussion
ryrysweetiepie is offline  
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post #2 of 3 (permalink) Old 09-28-2009, 08:05 AM
 
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Location: singapore
Posts: 425
Re: question about effects loop, and interesting theory

About true bypass:

http://www.youtube.com/watch?v=MOBn7...eature=related

Teo
teokiatuan is offline  
post #3 of 3 (permalink) Old 09-28-2009, 12:09 PM
 
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Thumbs up Re: question about effects loop, and interesting theory

Quote:
Originally Posted by ryrysweetiepie View Post
now my understanding is that the pedals in an amps effects loop shouldn't suck tone, because effects loops have a lower amount of signal required than the guitar intput on the amp (or something like that?). is this true? i have also heard of having a buffered effects loop on your amp. is that something that every effects loop should have?
as suggested, read up on buffering and true bypass. Once you're at line level, driven by the amps preamp no tone sucking should occur from mismatched impedances and such.
I don't see how you could have a non buffered fx loop on an amp, perhaps we're talking about serial v parellel loops? Alternatively some amps are advertised as "tube-buffered fx loop", meaning they use tube for buffering, but that doesn't mean the other amps don't have buffered loops, just that they're solid state.

Quote:
and also, i think the theory of an effects loop is good sometimes, but completely contradicts itself other times. the whole idea is to put the modulation and timebased effects after the gain from the amp. so they put a send and return jack between the preamp and the power amp because in theory the gain and tone comes from the preamp tubes, and the volume comes from the power amp tubes and therefore the mod and time based effects have been put after the gain and tone in the amp.

well for me and many other people, the power amp plays a huge role in the tone and gain of my amp. i have a marshall 1987x reissue, and really the only way to get gain is from the power amp. therefore, the mod and timebased effects are not put after the gain stage of my amp. so is me putting these effects in the amps effects loop even serving a purpose? the whole theory just seems wrong
you have a point and guitarist have tried to address this in several ways,

for example running the power amp pre effects:
overdriven power amp out-> attenuator->fx-> dedicated clean power amp

or using a three-way stereo set-up:
preamp -> overdriven mono power (center)
preamp fx out -> fx-> stereo clean power amp (left&right)

or miking the poweramp and using mixing board effects (both studio and live)
IIRC Vai has used the last option. Mustaine the first set-up and Satriani the second, Extremist-era.

The question is do you need this, perhaps if you're used to running the 1987 at volume 7-10. Those who do not run their poweramps at such volume won't really need it and even if you do, the type of poweramp distortion (sag and compression) will not interfere as much with time based effects as preamp cascaded gain would. Which is why loops make sense for a lot of people.
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effects chain , effects loop , tone suck

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