Plexi 100 very blanketed now

[FractalAudio]

I reran the parameter generator tools and I must've screwed something up.

For now you can fix the model with the following:

Preamp
Preamp Bias: 0.128

Cathode Follower
Compression: 74.9%
Harmonics: 0.608

There's another hidden parameter that needs to be updated but it isn't as important as these three.

 

[danzego]

I reran the parameter generator tools and I must've screwed something up.

For now you can fix the model with the following:

Preamp
Preamp Bias: 0.128

Cathode Follower
Compression: 74.9%
Harmonics: 0.608

There's another hidden parameter that needs to be updated but it isn't as important as these three.

Thank you for looking into that and I look forward to the fix. Dang, I wish I didn’t have to get ready for work! I want to try this. It’s nice to know I wasn’t just nuts.

 

[Karl Houseknecht]

I reran the parameter generator tools and I must've screwed something up.

For now you can fix the model with the following:

Preamp
Preamp Bias: 0.128

Cathode Follower
Compression: 74.9%
Harmonics: 0.608

There's another hidden parameter that needs to be updated but it isn't as important as these three.

That seems to make a very minor difference in the tone. Still pretty muddy and blanketed here.

 

[FractalAudio]

That seems to make a very minor difference in the tone. Still pretty muddy and blanketed here.

Makes a significant difference here. Remember the mid and treble pots are log taper on this model. Don't be afraid to turn them way up.

 

[Karl Houseknecht]

Makes a significant difference here. Remember the mid and treble pots are log taper on this model. Don't be afraid to turn them way up.

Is that something that changed in the last release?

 

[FractalAudio]

Is that something that changed in the last release?

Always been like that.

 

[FractalAudio]

Here's the real amp vs. the model with the fixes:

https://www.fractalaudio.com/tmp/Plexi_100.mp3

All knobs at noon.

 

[Admin M@]

Here's the real amp vs. the model

No difference to my ears

 

[Karl Houseknecht]

Might be my 54 year old ears, but I'm not hearing anything significantly different there. However, you had me at Lifeson.

Edit: Oh! You were comparing the real amp to a model, not the model before and after fixes. LOL...yeah, my ears are okay then.

 

[Karl Houseknecht]

I tested this with one of my favorite Dynacab recipes and I can definitely hear a difference in the high and low end now. Which makes me wonder if something happened to that particular factory preset in the upgrade process beyond just those amp parameters. The amp itself works fine now outside of that preset and cab.

 

[FractalAudio]

I tested this with one of my favorite Dynacab recipes and I can definitely hear a difference in the high and low end now. Which makes me wonder if something happened to that particular factory preset in the upgrade process beyond just those amp parameters. The amp itself works fine now outside of that preset and cab.

That cab isn't the best choice IMO but it's possible there's something more going on w/ that preset.

 

[maxc]

Here's the real amp vs. the model with the fixes:

https://www.fractalaudio.com/tmp/Plexi_100.mp3

All knobs at noon.

I'm not sure which one is the real amp here, but the first one sounds noticeably brighter.

 

[Chromatizm]

I'm not sure which one is the real amp here, but the first one sounds noticeably brighter.

Same here, noticeably less bass on the first 20 seconds, drier sound.

 

[DLC86]

I'm not sure which one is the real amp here, but the first one sounds noticeably brighter.

It just sounds slightly louder and that might give the impression it's brighter (Fletcher-Munson yadda yadda), turn up the volume a bit on the second part and they sound identical... at least to my ears

 

[Jamar]

I reran the parameter generator tools and I must've screwed something up.

For now you can fix the model with the following:

Preamp
Preamp Bias: 0.128

Cathode Follower
Compression: 74.9%
Harmonics: 0.608

There's another hidden parameter that needs to be updated but it isn't as important as these three.

Thanks for confirming the issue and recommending the manual setting changes as a quick fix. Karl and I both feel vindicated.

 

[maxc]

It just sounds slightly louder and that might give the impression it's brighter (Fletcher-Munson yadda yadda), turn up the volume a bit on the second part and they sound identical... at least to my ears

No matter how much I amplify the second part, it just has a completely different frequency profile.

 

[DLC86]

No matter how much I amplify the second part, it just has a completely different frequency profile.

Ok...



The only part where I see a major difference in the spectrum is at 100 Hz and below, and I probably didn't hear that cuz the speakers I have in front of me right now probably don't go that low... but other than that they look pretty much identical to me.

PS: and it was an mp3 file, so probably not the best medium to do such comparisons

 

[austinbuddy]

Makes a significant difference here. Remember the mid and treble pots are log taper on this model. Don't be afraid to turn them way up.

I had been doing that - mids and treble on 10 — and I loved it - a smoother Plexi, great for chords. Recorded some with this as well (Aerosmith Rocks and Toys rhythm tracks).

Good to know how to adjust back in existing firmware.

Hey! When you update - we may wanna to know how re- adjust parameters to revert back to this “sorta dark” 100W version! It’s very cool!

 

[rzjd]

Is this just for the Plexi 100 model or are other Plexi models impacted, like the Plexi 50W high?

 

[Karl Houseknecht]

Is this just for the Plexi 100 model or are other Plexi models impacted, like the Plexi 50W high?

I don't think the 50 watt model is affected.