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11-03-2010, 03:16 PM
| | Registered User | | Join Date: Feb 2010 Location: Oklahoma | | | SWR SM-400 question
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I have an odd SM-400 that hopefully someone may be able to help me figure it out. From all the specs I have read and the fact thats all its marked as it is a standard SM-400 but it has th extra knob the SM-400S has on the front panel. Has anyone heard of this or is able to shed any light on this matter? Ill post pics asap.  
Last edited by JonYouth : 11-03-2010 at 04:28 PM.
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11-03-2010, 03:18 PM
| | Registered User | | Join Date: Aug 2008 Location: San Diego, CA | | |
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11-03-2010, 03:32 PM
| | Registered User | | Join Date: Feb 2010 Location: Oklahoma | | | Yes but mine is not a SM-400s it is labeled an SM-400 as it has no cooling fan it is cooled by a heat sinc, it only puts out 200 w a side stereo, I checked that website and I even called the support number. |
11-03-2010, 04:05 PM
| | Registered User | | Join Date: Jan 2010 Location: Vancouver | | | There are people doing mods on them, it's not unheard of. IIRC the extra knob on the SM-400S is an effects blend, you can try to figure out what yours does. |
11-03-2010, 04:12 PM
| | Registered User | | Join Date: Feb 2008 Location: Maryland | | Quote:
Originally Posted by Alex1984  There are people doing mods on them, it's not unheard of. IIRC the extra knob on the SM-400S is an effects blend, you can try to figure out what yours does. | The effects blend knob is labeled "Transparency" on my 400S. I keep it all the way up for the most part since my Sansamps run through the effects loops.
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11-03-2010, 04:19 PM
| | | | Back in the day when Steve Rabe owned SWR, they were very consumer friendly
I had bought a very early SM400, which did not have the transparency control
A year or so later, they added this feature although the amp name did not change
I called the factory to explain that I would like to pay to have this feature added if possible; ended up talking to Steve who charged me $35 and paid the return shipping
He added the circuit, pot, checked the amp for proper performance (it actually put out something like 450 watts bridged at the rated distortion level) and paid the shipping back
Needless to say, they were not able to gut the amp for this price to put on a new silk screened front panel. Great customer service and pro level support for just regular guys.
And now you know! |
11-03-2010, 04:41 PM
| | Registered User | | Join Date: Feb 2010 Location: Oklahoma | | | So they started doing this to the SM-400 before the SM-400s? |
11-03-2010, 06:16 PM
| | Registered User | | Join Date: Mar 2000 Location: A nation of immigrants | | | There were also factory mods for a headphone jack, moving the effects loop to pre-master volume and adding a variable pad and ground lift to the DI. Basically you could add all the features of an S model (and then some) to a 400.
If you look at the schematics, you will see that you can even raise the output of a 400 to 500 levels by swapping out a bunch of passive components. Heat dissipation becomes much more of an issue which is why, I imagine, they had to add the fan to the S and subsequent 500 models.
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11-03-2010, 06:33 PM
| | Registered User | | Join Date: May 2006 Location: austin,tx | | | The front looks exactly like my 400S to a T....well almost. The knob underneath the treble knob on yours looks like it's not labeled. On mine that's a "transparency" knob, basically a high treble knob, higher than the one labeled treble. I don't know what effects blend knob they're talking about. Plug straight into the amp, hook it up to something with a tweeter in it and turn that knob all the way left to right and see if it changes highend content or not. If it does, it's an unlabeled transparency knob, if it doesn't, it may be an effects blend so then try it with some effect and see if it affects that.
Mine has a cooling fan mounted in the middle of the amp (not visible from the outside) that blows down the heatsinks and out the side. If I remember right (have to look up the manual again) my XLR DI out is pre-eq and the 1/4" jack label "line out" is post eq.
If anybody has any mod links, I'd like to fix my DI and put a pre/post switch and a level control on it. Search "aural enhancer mod" on here to see how to re-voice the amp, actually level it to a more even output instead of being pre-voiced. |
11-03-2010, 08:06 PM
| | | Quote:
Originally Posted by JonYouth So they started doing this to the SM-400 before the SM-400s? | Yes
It actualy started on the 220 watt model head as I understand it
In regards to the headphone mod, I was directed to an SWR guru through this board and asked about the headphone mod; he said that it was done at the factory to Randy Jackson's amp but didn't think that the factory did any others | | Thread Tools | Search this Thread | | | | 
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