Profex II question

Mike Spaeth · From: Springdale, Arkansas

I have recently started using a Profex II unit through my Nashville 400. I know it serves as a preamp but to me the sound is very thin. I like to set my amp with a nice warm tone that I can't seem to get with the unit. Is this normal for the Profex II?

Smiley Roberts · From: Hendersonville,Tn. 37075

Are you plugging it in the front or back of the amp? Since the ProFex II is also a pre-amp,you should plug it in the back,("power-amp in"). Ain't no sense in goin' through 2 pre-amps. Turn the output volume control (on the ProFex),wide open,& turn the input vol. cont. to 12'o clock. Then,just turn all the controls on the front of the amp down,& let the ProFex do it's job.

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  ©¿©          ars longa,


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Mike Spaeth · From: Springdale, Arkansas

Yes, I'm going thru the back only and completely bypassing the Nashville 400's system. I have tried going thru both and I do get the warm tone I like, but I also get a hum I can't live with.

Jack Stoner · From: Kansas City, MO

You're probably getting a "ground loop hum".
Do you have anything else in your rack, like a power panel, tuner, etc? Many times these devices can cause the hum problem.

If you do have other devices in the rack, take the Profex II out of the rack and then see if you have the hum problem. You may have to use "humfrees" or a similar isolation tab to isolate the other units from the rack rails.

Tim Harr · From: Dunlap, Illinois

Mike,

The set up you are using may be OK; But what settings are you using on your PF II?

This unit (unlessusing the Steel Guitar settings listed on Jack Stoner's Web Site) can sound thin and downright terrible.

Check your settings of the EQ to see if you still have a 'thin' sound.

Also check your cable going from your PF II into the Power Amp in jack of your NV 400.

Good Luck,

Tim

jerry wallace · From: Artesia , NM (deceased)

Mike,I have both the profex and a tubefex...The profex uses a "wallwart" and the tubefex has a built in power supply..Other than that they are basically the same..

I get a hum also when using the profex that seems to change and improve depending on the location and position of the wallwart..Try moving it {wallwart} around,turning, twisting etc.. to change its position..I think this will help with the hum..

I dont have the hum problem with the tubefex..I go threw the front input on a Nashville 1000 and take all on the EQ out of the profex just using it for effects, delay compression, etc..I use the regular EQ knobs on the front of the amp and I am satisfied with the tone this way..

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Jerry Wallace-2001 Zum: D-10,8+6, "98 Zum: D-10,8+8,Nashville 1000,Session 500 ,Session 400 head only amp,Tubefex,ProfexII, Artesia, New Mexico
http://communities.msn.com/jerrywallacemusic

Frank Parish · From: Nashville,Tn. USA

There's a video that you can get for the PF II that'll help to set it up correctly by Jeff Newman. Don't set the PF II next to the pick-ups on your guitar. I set mine on the left and use my left hand to change settings.
You can change the overall EQ and everything on the unit if you know how. If you're using it for steel you should have the Newman settings or something close to them.

Jack Stoner · From: Kansas City, MO

If you have humbucking pickups putting the Profex II (or any power operated unit) on the right side near the pickups is not a problem. When that video was made humbucking pickups were not as prevalent as they are today.

There have been several threads on hum problems with the Profex II, or other units, and many of them have turned out to be other units in the rack causing the hum problems and the users had to use the "humfrees" or similar isolation tabs to isolate the units from the rack rails.

Glenn Suchan · From: Austin, Texas

Mike,

I used to own a Profex II and my suggestion about the thin sound would be to see if the problem exists with every program "address" you use. If not, go into the the "addresses" where the problem is present and edit to tweak the settings for output levels and equalization. If the problem exists with every "address" you are using then the answer might be to make the changes "globally" with the unit. I don't remember how this is done so you might want to refer to the user manual (it's very well written).

Also, it is possible to tweak things "on the fly" with the PF II. Just go to your desired address and initiate an "editing" capability leave it that way while you play and you can digress through the settings and make changes to any part of the address. When you're done you can save them if you like or exit the edit and the PF II will revert to the previously saved settings. (I used to do this to tweak delay frequencies on the fly).

About the hum, Jerry Wallace probably hit on something with his comments about the "wallwart". If the wire is breaking down or if the wallwart is near an electrical ballast such as a neon lighting unit, it's possible for a hum to occur. I'd look into that as a possible cause.

I understand the reason for designing a unit with a wallwart, but they could at least design a more durable unit. I don't know how many times I've had to replace a dadgum wallwart at the most inconvenient times.

Good luck to you, Mike.

Keep on pickin'!
Glenn

[This message was edited by Glenn Suchan on 18 October 2001 at 11:36 AM.]

Mike Spaeth · From: Springdale, Arkansas

Thanks everyone for all the help. I've seemed to have got rid of the hum by using some little plumbing washers under the screws that mount the unit to the rack.
I've got rid of the thin problem also,because now without the hum, I can go through the amp first and then to the Profex II. This way I can warm up the sound with the Nasville 400's own controls.

Again thanks for all the help!
This post can now be closed.

Jack Stoner · From: Kansas City, MO

Aha, it was a ground loop hum problem. Those insulating washers do about the same thing the humfrees do.

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