I'm using a fdeck HPF In the effects loop and that works well on upright. I think the fx loop is post EQ. So not sure if that's gonna do what you want. Let us know.
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Thanks. I am very happy with my EBS preamp. I mainly want the Rumble 800 combo for the power amp and speakers. The preamp stage of the Rumble is not needed. I was just curious if anyone else here does the same by using an external preamp and if they noticed an improvement in sound with bypassing the Rumble preamp stage.
Dv, plugging your external preamp into the Rumble s FX Return will, indeed, bypass the Rumble's internal preamp. There is a switch in the FX Return jack, which closes when nothing is plugged in there, that allows the internal preamp signal to go to the power amp. But, whatever is plugged in there opens the switch and cuts off the internal signal from the power amp, so the power amp gets only your external signal.
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The only thing perfecter is if you show off your new Rumble to the Fender Rumble Club and get a free membership.
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Thanks. I will report my findings here after I receive my Rumble next week.
I have the Rumble 500 head, as well a EBS Microbass 3 preamp-DI.
I've run my EBS unit to the effects return of the Rumble head and it completely bypasses the Rumble preamp. It works great!
Awesome! Do you notice a sound difference using your EBS with Rumble vs. just using the Rumble?
Yes, there most certainly is a sound difference. I get what I like about the EBS unit, both tone and feature-wise. It's almost like having a different amp head. I hope you get what you what you want with your new Rumble amp, and your EBS Microbass 3.
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I was really impressed with the tone of the EBS Microbass 3 when I first received it but didn’t understand how good it really was until I compared it with my old Roland DB-500 combo and a new Zoom B6 effects pedal. The B6 has every effect imaginable plus lots of classic amp modeling. The B6 is just so sterile and not anything near the warmth of my EBS. Now if I use my B6 I hook it to the effects loop of my EBS so I don’t give up that full, warm tone.
maybe it's in the Rumble wiki or earlier in this thread but I couldn't find it.
Question:
If the output switch is set to low and you have a 4 Ohm or 8 ohm extension connected what is the output at the low setting? In the manual it says (200W or 100W internal) but what about with an external cabinet?
From the manual:
OUTPUT SWITCH: Set switch to FULL for normal maximum power (800W or 400W internal). Set to LOW to get the same tone at reduced output/volume levels (200W or 100W internal)
EXTERNAL SPEAKER OUTPUT/IMPEDANCE SWITCH: Connect an external speaker cabinet (8Ω or 4Ω minimum impedance) to this combination output using a Speakon® or 1/4” cable. Set switch to match impedance rating of external cabinet; continuous power rating of external cabinet must meet or exceed power rating listed for chosen switch setting. Set switch to 8Ω when no external cabinet is connected.
Question:
If the output switch is set to low and you have a 4 Ohm or 8 ohm extension connected what is the output at the low setting? In the manual it says (200W or 100W internal) but what about with an external cabinet?
From the manual:
OUTPUT SWITCH: Set switch to FULL for normal maximum power (800W or 400W internal). Set to LOW to get the same tone at reduced output/volume levels (200W or 100W internal)
EXTERNAL SPEAKER OUTPUT/IMPEDANCE SWITCH: Connect an external speaker cabinet (8Ω or 4Ω minimum impedance) to this combination output using a Speakon® or 1/4” cable. Set switch to match impedance rating of external cabinet; continuous power rating of external cabinet must meet or exceed power rating listed for chosen switch setting. Set switch to 8Ω when no external cabinet is connected.
That switch is also sometimes called "the quarter power switch". So, if full power is 400 watts with no cabs and 800 watts with 8 or 4 ohms of cab(s), then "quarter power" is 100 watts with no cabs and 200 watts with 8 or 4 ohms of cab(s).
From the Fender U.S. webpage Invalid Link Removed
The new Mesa Subway amps do this as well, not as documented like this but, it is a known feature utilizing the 8-4/2-ohm switch.That switch is also sometimes called "the quarter power switch". So, if full power is 400 watts with no cabs and 800 watts with 8 or 4 ohms of cab(s), then "quarter power" is 100 watts with no cabs and 200 watts with 8 or 4 ohms of cab(s).
From the Fender U.S. webpage Invalid Link Removed
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DJ, does that switch lower the power by switching to 2-ohm when using 8 or 4 ohm cab(s)? How much lower does it go?
The Rumble 800 COMBO also has an Impedance switch and, I believe, also works like that. But I've no idea how much lower the power goes.
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On the Mesa's it's half and also depends on the amount of cabs and impedance of cabs.
The amp usually runs at 800 watts at 4-ohms, 400 watts at 8-ohms.
As the amp is set for 2 ohms starting with an 8-ohm cab you get 300 @ 8-ohms, then 600 watts @ 4-ohms for a 4-ohm load.
So depending on switching and cabinet loads, you can get 300, 400, 600, 800 watts output out of the 800 watt Mesa heads.
Always use the 2-ohm setting for anything less that 4-ohms always though.
Got that amp stand coming this week. Thanks for the recommendation Randy!
...and finally yesterday I ordered a Rumble 210 in order to extend my awsome Rumble 800 Combo!!
Rumble On!! 
