Impedance mismatch between EFX

[OldogNewTrick]

hi guys

I play mostly thru my Carl Martin 3-band para EQ pre into my power amp / cab or my in-ear setup.
I am considering adding a simple tube pre like the ART Tube MP or the ART Tube PAC to the signal chain.

In which sequence would you place them ?
bass -> ART tube pre HiZ input -> 600Z output -> CM 3B para EQ 1M Z input -> 600Z output -> power amp / cab ?
Or the other way around ?

Now to complicate things further, I want to run on occasion thru a Bod xt bean .
Where would you place that ?


So I'm thinking Bod->TubePre->CM paraEQ-> amp/inears, disregarding all impedance issues.

What do you think ?

[bongomania]

bass --> EQ --> Bean --> ART --> power amp

Reasoning: the ART will drive the power amp (assuming it's able, I haven't tried, but it should). Therefore you don't need the CM or the Bean to run as anything other than instrument-level fx boxes, one for EQ and the other for amp modeling etc. I suggest the ART (instead of the CM) to drive the amp because I suspect the ART only has a balanced line-level output.

I don't think there will be any notable impedance issues, however there may be issues of mixing balanced with unbalanced (shouldn't be a prob. in the order I described, but may well be a prob. otherwise), and there may be issues of gain levels- you'll need to spend some time (especially with the Bean!) setting the input and output gains to avoid distortion and noise.

I don't know the z in of the ART "HiZ" input, but the 1M z in of the CM is ideal for passive instruments.

[OldogNewTrick]

bongo, the CM pre drives both power amp and inear setup effortlessly.

Actually everything works fine, adding the ART, I hope to get a slightly warmer flavour. In some other thread guys were saying, the somewhat sterile tone of the bod-xt is being improved by a good tube DI. All units are linked via true bypass loopers....

I just seem unable to stop messing about

[bongomania]

Have you verified that the ART pre's have an instrument-level unbalanced output post the tube stage? If they don't then you have both level issues and balanced/unbalanced issues to contend with when connecting it as an "effect pedal". That's why I suggested using the ART to drive the amp, not because I thought the CM couldn't.

[OldogNewTrick]

from their website

# Maximum Input Level: +17dBu (1/4”), +16dBu (XLR)
# Maximum Output Level: +20dBu (1/4”), +26dBu (XLR)
# Input Connections: 1/4” TRS unbalanced (1meg Ohm)
# XLR female balanced
# Output Connection: 1/4” TRS unbalanced (600 Ohm)
# XLR male balanced, (<300 Ohm)


thought to adjust the tube flavour with the gain and keep the output low in order not to overload the subsequent CM EQ.

Still wonder though, what, if any effect does it have to connect a device with an output impedance of 600 ohms to a device with an input of 1 Mohms ....

[ehque]

IIRC, you don't need to match impedance between pedals you connect together. A high input impedance and a low output impedance is all you need. I might be wrong.

[OldogNewTrick]

Originally Posted by OldogNewTrick

Still wonder though, what, if any effect does it have to connect a device with an output impedance of 600 ohms to a device with an input of 1 Mohms ....

anybody else ?

[bongomania]

Low z out into high z in = OK.

[OldogNewTrick]

Originally Posted by bongomania

Low z out into high z in = OK.

thanks bongo !