Single Rectifier & 2X12 cab

[vertigo]

I have purchased a second hand single rectifier series 2, my first mesa amp !!!!

I have a 2X12 cab which I used as an extension cab for my Marshall DSL401. This cab has a celestion vintage V30 & a celestion G15 75th anniversary fitted. This cab was wired in series giving a rating of 60watts at 16ohms and it sounded sweet with the marshall.

I looked at the instruction manual for the rectifier on line before I bought it and noticed it only had 8ohm and 4ohm speaker outputs so I have rewired the cabinet in parallel to 60watts at 4ohms. I have tried the cab with the rectifier and it is to harsh, I can only get the output at about number 1 !!! even then it is not sweet. The masters are about 60%

Now I have got the amp ind user manual it turns out that I could have left cab as it was using the 8ohm output.

Will putting it back to 16ohms give a less harsh sound ????

Any help would be appreciated

 

[screamingdaisy]

Bring the channel masters back down. Put it down to around 10:00 on the high gain channel and adjust your clean channel to balance. That'll give you some room to open up the master volume, which in turn should give you better results.

I can't speak about the cab because I have no idea what a G15 75th Anniversary is.

 

[vertigo]

Thanks for the advice, the G15 is a 30 watt speaker, so if my maths are correct a 60w and a 30w in parallel is 60w (30w + 30w).

I am open to advice if I am wrong

Thanks

 

[screamingdaisy]

60w is correct.

I'd give the new channel volumes a chance first. The harshness could originate with the high channel volumes overdriving components later in the signal path... particularly if you have the effects loop on.

Failing that, I found I had problems dialling back the fizz until I switched to a Recto cab.

 

[vertigo]

Put it back to series and 16ohms, completely different sound a lot sweeter. I guess its a loud amp.

Is best to control the volume via the masters or the output pot ???. Is it true the masters drive the pre-amp better when they are up

Thanks

 

[screamingdaisy]

Put it back to series and 16ohms, completely different sound a lot sweeter. I guess its a loud amp.

Is best to control the volume via the masters or the output pot ???. Is it true the masters drive the pre-amp better when they are up

Thanks

The channel masters are after the preamp, they control how hot the signal is leaving the preamp and have nothing to do with how hard your preamp is being driven (that's what the gain knob is for).

Most Mesa's I've used sound choked off if you run the master output really low. It's better to run the channel master low and the master output up higher.

 

[vertigo]

Cheers, I will have a play tomorrow after work. I guess I need to spend a bit of time trying things out. Things are going to be different than my Marshall

Thanks