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05-12-2010, 11:43 PM
| | Registered User
Bass player | | Join Date: Dec 2009 Location: Downunder Oz | | | Mod For a Sansamp RPM
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I found this post` but can this done with an RPM or RBI ? If it can you could maybe mix a clean sound with a dirty sound if you have a Stereo amp.
According to Lloyd Schwartz at Tech21, the SansAmp can be modded so that its XLR output can put out up to +4 dBu, which is enough to drive a PLX 2402 to full power.
Here's what he wrote :
When you remove the back cover of the Bass Driver, you'll see a "black box".
Just to
the right of its lower right corner, there's a resistor surrounded by two
arrows.
It looks like this:
>O< (except it's square)
Remove it, and you're done!
BTW, the resistor is an SMT type (a small black rectangular shape].
Well, a larger signal is a boost in volume. I don't know for sure if it'll affect tone, but probably not.
Has anybody modded an RPM or RBI so the XLR puts +4db ?? |
05-12-2010, 11:50 PM
|  | OVNIFX
EXAR pedals rep for North & Central America | | Join Date: Oct 2005 Location: PDX, OR | | | The mod you're talking about was only for the original BDDI pedals, not the RBI or RPM. To the best of my knowledge nobody has suggested or requested mods to boost the output of the RBI or RPM. Do you have one currently, and is it not driving your power amp adequately? |
05-12-2010, 11:58 PM
|  | Registered User
Endorsing Artist: Spector, Aguilar, EMG, Coffin Case, Maxon | | Join Date: Jun 2005 Location: las vegas/maui, nevada/hawaii | | | cant this already drive a poweramp? maybe im missing something.. |
05-13-2010, 12:08 AM
|  | vintage bass nut
John K Custom Basses | | Join Date: Feb 2008 Location: Thousand Oaks, CA | | | i have no idea why you'd want to get more output out of an RPM. IME, it already has more than enough output to drive even the least sensitve poweramps. the manaul says: Maximum Output Level: +10dB or better.
Last edited by johnk_10 : 05-13-2010 at 12:11 AM.
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05-13-2010, 07:11 PM
| | Registered User
Bass player | | Join Date: Dec 2009 Location: Downunder Oz | | | NO i meant to make the uneffected (XLR) output stronger so that you wouldnt need to two preamps.
The idea is to mix the uneffected & effected signals without using another Preamp. The uneffected signal is not strong at all but if it could be modded so you wouldnt need to purchase another preamp to get the dry signal to your stereo amp.
When i do this at home the level of the effected signal is on about 1 or 2 where the uneffected is nearly full blast.
So if you could boost the dry signal you could mix dry & wet properly using only 1 preamp. |
05-13-2010, 07:21 PM
| | Registered User | | Join Date: Feb 2009 Location: Maine | | | Is that what the blend knob is for? I don't know, I don't have a sansamp but I've been wanting one to mix dirty/clean tones... |
05-13-2010, 10:35 PM
|  | Fingers, pick, and a little bit of slap | | Join Date: Dec 2001 Location: Terrapin country (Crofton, MD) | | Quote:
Originally Posted by king rew  Is that what the blend knob is for? I don't know, I don't have a sansamp but I've been wanting one to mix dirty/clean tones... | Yes, Blend controls the mix of dry and wet signal, but only for the effected output. I'm guessing that Growly wants to run a stereo power amp into two speaker cabs, with one cab getting the wet signal and the other one being dry. |
05-13-2010, 11:28 PM
| | OVNIFX
EXAR pedals rep for North & Central America | | Join Date: Oct 2005 Location: PDX, OR | | | Ah, OK, I get it now. Growly, the mod you read about does not apply to the DI output of the RPM or RBI. It would certainly be possible to add a gain stage in there though, so you should talk to a pedal-builder in your area. Just tell them you need a FET or opamp clean boost with about 40 dB gain. Just for perspective, it's way way more involved than just removing a resistor, but for a pedal-effect-type circuit building person it's a fairly simple project. |
05-14-2010, 01:01 AM
| | Registered User
Bass player | | Join Date: Dec 2009 Location: Downunder Oz | | | Thank you so its possible to do thats great, i should have said the DI but it slipped the mind.When i have a jam at home & try mixing the Dry & Wet signals & i get some really nice tones.
The Blend Knob does mix wet & dry but its not really dry......the EQ is effecting the signal. So you really cant get a truley Dry signal using the Blend. I read somewhere a guy was trying to set-up a fake stereo rig at home with a clean dry signal to 1 cab & a super wet signal in the cab & was getting nice sounds so i tried it.
Now if i do this to the DI will i still be able to use the output like normal, wont it be way to hot of a signal ???
The RPM is supposed to be a rackmount version of the Sansamp Acoustic DI pedal with the added Drive control !!!
Lets see how we shall we.
Keep Rockin,Pluckin & Pickin |
05-14-2010, 01:17 AM
| | OVNIFX
EXAR pedals rep for North & Central America | | Join Date: Oct 2005 Location: PDX, OR | | Quote:
Originally Posted by Growly Lytes Now if i do this to the DI will i still be able to use the output like normal, wont it be way to hot of a signal ??? | If the pedal guy installs the extra gain stage right before the XLR jack, it will not affect the other outputs. If you want to still be able to use that XLR jack for a DI sometimes, then have the guy install a bypass toggle switch, to bypass the added gain stage. | | Thread Tools | Search this Thread | | | | 
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