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svt4 & ampeg pr-410hlf PROBLEMS!

#21
OK hey, the 4PRO and cab are probably just fine. Here's something I noticed right away with your settings. When I play all of my amps flash the lights...

But with my Fender American Deluxe the gain of the bass is about the same as a non-active bass. My gain control on the #1 amp is set at 3/4 cranked. The LED flashes with every note. The bass is turned up also.

With your knob only at 25% you are smacking the input much harder from the bass than I do. Now you mentioned 50% on the master, that's straight up 12 O'Clock That's probably fine with the PRO410 in mono-block mode as they take a bit more power than a regular 410HLF. I run 810's and with a low B string, I run about 5/8th cranked up to keep the speakers from maxing out.

The Limiter flashes on every note too, it might not on your 410. I have no need to run my amps any higher than those settings as there is 6 of them running currently and the neighbors 6 blocks away can hear me playing with the house closed up...

SO. You have some issues in your configuration. I'm not comfortable with your buddy's wiring job. You need to dig in and get it figured out.

BOB
 
#22
The manual is quite messed up. The gain setup on this head is the most important part in getting a good sound along with good volume. You will never be able to get the full wattage out of it if you set the gain according to the manual. Dropping your signal 15db will force you to crank the Master volume knob to an insane setting to get enough volume. Trust me on this one!
 
#23
Gearhead17 said:
The manual is quite messed up. The gain setup on this head is the most important part in getting a good sound along with good volume. You will never be able to get the full wattage out of it if you set the gain according to the manual. Dropping your signal 15db will force you to crank the Master volume knob to an insane setting to get enough volume. Trust me on this one!
Click to expand...

Lets rephrase this a little

Dropping the input -15db by pushing the attenuator means you would need to turn up the PREAMP GAIN by 15db to get back to the same level, has nothing to do with the master.

Setting the preamp levels allows you to maximize the signal to noise ratio at the input section. By cranking the master up instead, you would be amplifying noise instead of signal trying to get the same output.

Input signal... what goes into the preamp. GAIN CONTROL, controls signal at the preamp level, crank it up until the the LED flashes HARD on notes, master adjust amp output to taste.

In this instance there apears to be massive fire coming out of the bass. I'd get that tamed first. I wouldn't want to be using attenuators in my signal chain..

BOB
 
#24
Sounds like I have this exact problem with my 4PRO (distortion at any gain/master setting). Definately not the guitar!

My amp cut-out during a gig and when I had it fixed I was told the I C had blown. It worked for a few days and then the ever-present distortion appeared.
Fortunately I've since got my hands on my all-time favourite head so have not felt rushed to get the 4PRO fixed.

I hope you get yours sorted ok. I'll be watching in hope that you find a remedy.
 
#25
Thank you guys SOO much! I'm going to have another person look at the wiring and tubes. Also, so basically what you guys are telling me, and please correct me if I said this wrongly, but I have everything adjusted the wrong way on my svt4?? And it's not the amp or speaker, it's just the bass wiring or tubes? Also if I wanted to have a loud rig, because I understand that a 410 can only go so loud, that I would need another cabinet to get a louder sound and spread the power through two speakers?? Is getting a Mesa Boogie 2x15 going to be ok?? I'm sorry to bother you guys so much, but I want you to know that I REALLY appreciate your help and would like to fix the distortion sound.
 

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