KVR Audio

Agility · Post by **Agility** » Sun Feb 21, 2016 8:08 pm

Wild Hades wrote:
Agility wrote:"- Refined filters frequency precision for the MQ5 and H3C models, compared to the original design."

What does this imply regarding the filter unit, is it going to give similar results to the original or some enhanced feature?
In analog electronics it's pretty much impossible to design a filter with a peak/cut/boost frequency that's exactly centered at a desired frequency, as you have to use and combine standard components.

For example, say you've designed a HPF with a certain time constant and you need a capacitor of 23.7nF to get that exact time constant, you are forced to use the closest standard value which is 22nF (or start combining multiple caps, which is unpractical and more costly). This causes the filters peak/cut/boost frequency to deviate slightly from the design, so, for example, instead of having a cut off frequency of 80Hz, it is placed at 85Hz.
In the digital domain you can get around this problem, so, in my models, I've tweaked the circuit values a little bit, to get the frequencies closer to the values declared on the panels.

Agility wrote:After doing some research it appears the HLF-3C gives a pleasant boost around the cut off frequency but chekcing this VST in VST analyzer it just looks like a typical digital filter, no boost..?
Interesting... can you link me the source, please? Because according to the schematics I have and the original HLF-3C manual (http://danalexanderaudio.com/OutboardPi ... lf3c01.jpg), those HP/LP filters don't have any (noticeable) resonance, by design. It may happen on the hardware unit because of component tolerances, though, but this would change from unit to unit too.

I see I see.

I did come across that pic/link after searching around some more, it was just anecdotes from users mentioning the bump... the schematics win?

Is the whole design off of schematics or do you use real units too?

Thanks.

camsr · Post by **camsr** » Sun Feb 21, 2016 8:39 pm

This thing is fantastic. The auto gain works great and the sound is just superb! It is so fast and easy to use, but if I had more experience with it, I think it could be 5 times faster to use.

One thing about it that's not making sense is the oversampling. In normal mode it uses about 4 percent according to FL, in oversampled mode it uses 28 percent! That doesn't seem proportional to 2x increase in sample rate.

Eleventh · Post by **Eleventh** » Sun Feb 21, 2016 11:44 pm

Is there a specific reason the input gain is not compensated by the way?

I think it would be much more useful as a "drive" control, where output is decreased by the input amount after the tube stage. Separate from the actual output control of course.

thewizrad · Post by **thewizrad** » Mon Feb 22, 2016 1:45 am

Amazing. The Pteq-1a already gets a lot of use here. Look forward to trying this one out. Thank you!

Wild Hades · Post by **Wild Hades** » Mon Feb 22, 2016 11:53 am

Version 1.0.1 now available on our official site!
Check the first post for more details.

http://www.igniteamps.com/audio-plug-ins

Obsolete236871 · Post by **Obsolete236871** » Mon Feb 22, 2016 12:17 pm

Thanks for this - also for attending to the reported bugs so fast.

I already tried your previous Pultec (PTEq-1a) and I liked it. However, I didn't use it more frequently since it was basically only the main Pultec module - which is of course limited in its capability and I found the bass boost tended to sound a bit "muddy" on the old one if I remember correctly.

Happy to see the new version with all three classic Pultec modules. That way it might be very usable as a "standalone" eq on channels, busses or a master without the need for complementation by other EQ plugins.

One question though (since I wasn't able to fully testdrive it yet) - Does it accurately model the attentuation and boost behaviour of the classic Pultec in an exact manner, so that one could do the classic hardware Pultec bass trick: boosting and attentuating the same low frequency area simulatenously, which will result in a well accentuated bass frequency with the neighboring frequency areas below and above being slightly reduced?

Vospi · Post by **Vospi** » Mon Feb 22, 2016 12:31 pm

Thank you for an update! Was waiting to try it out after bugs got fixed; now's the time.

Wild Hades · Post by **Wild Hades** » Mon Feb 22, 2016 1:11 pm

Izak Synthiemental wrote:One question though (since I wasn't able to fully testdrive it yet) - Does it accurately model the attentuation and boost behaviour of the classic Pultec in an exact manner, so that one could do the classic hardware Pultec bass trick: boosting and attentuating the same low frequency area simulatenously, which will result in a well accentuated bass frequency with the neighboring frequency areas below and above being slightly reduced?

Obviously!

Check this video, around 8:50:

camsr wrote:One thing about it that's not making sense is the oversampling. In normal mode it uses about 4 percent according to FL, in oversampled mode it uses 28 percent! That doesn't seem proportional to 2x increase in sample rate.

That's really strange... on my machines the CPU level increase is effectively 2x (a little bit more, actually, as the oversampling algorithm itself doesn't come for free), so 4% to 28% doesn't make any sense to me.
How did you set the buffer size? Can you see if this happens on v1.0.1 as well?

Eleventh wrote:I think it would be much more useful as a "drive" control, where output is decreased by the input amount after the tube stage. Separate from the actual output control of course.

This may be a good idea for the next "features" update. I can put a little knob next to the tubes switch and apply level compensation on it as well...

Twrogstudio · Post by **Twrogstudio** » Mon Feb 22, 2016 1:36 pm

Getting a problem with the oversampling on 1.01. Funky frequency response!!

Wild Hades · Post by **Wild Hades** » Mon Feb 22, 2016 1:59 pm

Twrogstudio wrote:Getting a problem with the oversampling on 1.01. Funky frequency response!!

More details, please!
Operating system, version in use, DAW, sample rate, buffer size, etc.

On my system it works fine, anyone else experiencing issues of the same kind?

Lesha · Post by **Lesha** » Mon Feb 22, 2016 2:19 pm

Wild Hades wrote:
Twrogstudio wrote:Getting a problem with the oversampling on 1.01. Funky frequency response!!
More details, please!
Operating system, version in use, DAW, sample rate, buffer size, etc.

On my system it works fine, anyone else experiencing issues of the same kind?

Working fine here (Win 32bit VST)

Twrogstudio · Post by **Twrogstudio** » Mon Feb 22, 2016 2:27 pm

Wild Hades wrote:
Twrogstudio wrote:Getting a problem with the oversampling on 1.01. Funky frequency response!!
More details, please!
Operating system, version in use, DAW, sample rate, buffer size, etc.

On my system it works fine, anyone else experiencing issues of the same kind?

El Cap 10.11.3, Logic 10.2.1, 44.1, 256.

Here's a pic. Everything set default, but with oversampling on. It just seems to be associated with the tube emulation. Everything's normal when it's switched off.

Wild Hades · Post by **Wild Hades** » Mon Feb 22, 2016 2:36 pm

Thanks for the details.
It must be the oversampling, not the tube emulation. If you switch the oversampling off, the problem should disappear.
I'm trying to replicate the problem on my machine, but I haven't been able to do it, so far...
I'll keep trying.

Twrogstudio · Post by **Twrogstudio** » Mon Feb 22, 2016 2:49 pm

Yes it is definitely the oversampling, but only in conjunction with the tubes switched on. Tubes off, OS on, no problem.
B.

Den* · Post by Den* » Mon Feb 22, 2016 3:41 pm

1.0.1 vers. Here on latest Logic X, under Yosemite 10.10.5 when oversampling is ON, the sound goes like bzzzzz.

The first version worked nice.

[UPDATE 1.1.0] Ignite Amps PTEq-X VST/VST3/AU (Pultec MEQ-5 + EQP-1a + HLF-3C emulation)