I like my GML 8200 - BUT...

[Gomez]

... mine is a pain in the arse.

Since I don't justify the extra thousands of pounds in stepped pots, all my mastering units are "standard version". Instead, what I do is a run an oscillator and sweep around to level out any disparities between L and R looking at the meters.

My trusty Massive Passive is 9 out of 10 times always matching in balance (meaning that what you dial is pretty much what you get). My IBIS is always a little out, mainly due to human error as the pots are small and light...

... the GML however is always WAY out! If I perfectly dial a boost in a frequency, when run the oscillator through it (it check lows, low mids, mids, upper mids and top) 10 out of 10 times the balance of L and R is different by a significant audible amount (we're talking 1 sometimes 2dB here)... I'm suspecting the left channel is slightly louder overall.

I was wondering if anyone had this problem or if anyone knows how to calibrate these beasts!

Thanks to all in advance.

[Caput]

Originally Posted by Gomez

... mine is a pain in the arse.

Since I don't justify the extra thousands of pounds in stepped pots, all my mastering units are "standard version". Instead, what I do is a run an oscillator and sweep around to level out any disparities between L and R looking at the meters.

My trusty Massive Passive is 9 out of 10 times always matching in balance (meaning that what you dial is pretty much what you get). My IBIS is always a little out, mainly due to human error as the pots are small and light...

... the GML however is always WAY out! If I perfectly dial a boost in a frequency, when run the oscillator through it (it check lows, low mids, mids, upper mids and top) 10 out of 10 times the balance of L and R is different by a significant audible amount (we're talking 1 sometimes 2dB here)... I'm suspecting the left channel is slightly louder overall.

I was wondering if anyone had this problem or if anyone knows how to calibrate these beasts!

Thanks to all in advance.

Can you hear any imbalance? Maybe it does not matter so much after all?


SB

[Gomez]

Hey SB

I'm from the "ear" school - I don't use analyzers, just the Dynamic Range meter. Yes, the difference can be VERY noticeable (audibly). If I boost a shelf starting at say 2.5K the left side will be noticeably louder...

[Caput]

Originally Posted by Gomez

Hey SB

I'm from the "ear" school - I don't use analyzers, just the Dynamic Range meter. Yes, the difference can be VERY noticeable (audibly). If I boost a shelf starting at say 2.5K the left side will be noticeably louder...

Ok - glad you are from the same school! I just remember from my old (old) day of some mixing that no processor we had had switches and so the engineer adjusted by sight and then ear. It is a problem for you I agree I just thought maybe not so much on your practice as you can hear it?


SB

[Paul Gold]

You could change the gain range set resistors for a smaller range. You probably don't need +/- 12dB.

[surflounge]

is there a buss EQ with one knob for both channels?

[matucha]

gyraf g14 for ex is stereo only

[Cellotron]

Originally Posted by Paul Gold

You could change the gain range set resistors for a smaller range. You probably don't need +/- 12dB.

Which is what I had done for my Sontec MEP250EX (which is similar to the GML 8200). A simple addition of a couple resistors per band changed the range from +/- 12dB down to +/-6dB so that settings and side matching is a lot less "tweaky". Not perfect - but way better - and with the advantage that 1/2dB gain steps are now available.

Best regards,
Steve Berson

[24-96 Mastering]

Originally Posted by Cellotron

Which is what I had done for my Sontec MEP250EX (which is similar to the GML 8200). A simple addition of a couple resistors per band changed the range from +/- 12dB down to +/-6dB so that settings and side matching is a lot less "tweaky". Not perfect - but way better - and with the advantage that 1/2dB gain steps are now available.

Best regards,
Steve Berson

Did the same with my Sontec 250C. Using it is much more fun now.

I imagine if you asked Massenburg / Manley, they'd happily instruct you on how to mod the GML. Or maybe they can mod it for you, if you prefer.

[Gomez]

Originally Posted by 24-96 Mastering

Did the same with my Sontec 250C. Using it is much more fun now.

I imagine if you asked Massenburg / Manley, they'd happily instruct you on how to mod the GML. Or maybe they can mod it for you, if you prefer.

Thank you all for the input, much appreciated.

The 6dB mod sounds like a great idea, but besides that, i would have thought these kind of units would be very precise and both channels calibrated to near perfection. Can the unit be calibrated anyway?

[sniperschool]

hey G
happy new year to you by the way bro
they can be calibrated but i always thought they had to go back to the 'GML/Manley 'mothership' to do it
there was another thread recently asking about it actually
let me know if you find out differently
you preferring the 8200 to the IBIS?
still got to get those cartecs up to you to have a listen to

[MASSIVE Master]

Originally Posted by Gomez

Hey SB

I'm from the "ear" school - I don't use analyzers, just the Dynamic Range meter. Yes, the difference can be VERY noticeable (audibly). If I boost a shelf starting at say 2.5K the left side will be noticeably louder...

Went through three of them before I finally just gave up for the same reason. Was told they were "within spec" (which I found to be the most ridiculous thing I had ever heard from a company with such a reputation).

Really liked the sound of the unit though. But "feathering" one knob and "throwing around" the other (and it was different from left/right - cut/boost of course) got really old really fast...

[Adam Dempsey]

Originally Posted by Gomez

Thank you all for the input, much appreciated.

The 6dB mod sounds like a great idea, but besides that, i would have thought these kind of units would be very precise and both channels calibrated to near perfection.

I've never known the stock 8200 to be channel accurate or recall accurate (it's +/- 15dB), and for mastering is why GML have the 9500 model.

Originally Posted by surflounge

is there a buss EQ with one knob for both channels?

Sontec MES462 can't be beat, IME.

[turtlerock]

me thinks you are perzactley right adam
on both counts

[Waltz Mastering]

Originally Posted by Adam Dempsey

I've never known the stock 8200 to be channel accurate or recall accurate (it's +/- 15dB), and for mastering is why GML have the 9500 model.

+1 - The 8200 can be a bit wiggley in the tooth when it comes to L/R balance, I notice it a bit more in the mid band. The 6 dB mod seems like a good idea. I can't remember ever needing any more than a few in an extreme circumstance anyway. Going to the 9500 is a big jump cash wise ($9G).

[yareck]

Originally Posted by Gomez

I was wondering if anyone had this problem

Yes I did. This is sick.

[exwel]

Originally Posted by sniperschool

hey G
happy new year to you by the way bro
they can be calibrated but i always thought they had to go back to the 'GML/Manley 'mothership' to do it
there was another thread recently asking about it actually
let me know if you find out differently
you preferring the 8200 to the IBIS?
still got to get those cartecs up to you to have a listen to

That was me.
6db mod sounds nice.

[Gomez]

Originally Posted by exwel

That was me.
6db mod sounds nice.

Thank you all for the info.

Happy new year to you Sniperschool!
I'm liking the GML, but it is quite different to the IBIS. I love the bottom end of the GML and it's really quite amazing at notching out stuff. The IBIS is getting only used for the top, which I really like. The bottom end can work on some stuff, not sure about the mids for mastering (taking into account that 70% percent of the stuff I master has distorted guitars) - th IBIS doesn't seem to get on with this.

I'm sure the 9500 is great, but I just don't have that money. I'm slightly shocked about this as the 8200 has been widely used for mix buss throughout the years.. I guess I'll call GML and see what they say. Slightly disappointed.

[ThomasE]

IMHO the 8200 sounds great on pretty much anything, but I agree that the precision of the pots isn't the best. There are some ways around this that I often use.

One way to balance the channels is to sum the source to mono, while listening to the difference signal post EQ and tweak until it nulls.

Or you can distribute the error differently by having the EQ in an MS-chain. Instead of L/R imbalance you'll get changes in the stereo width, which often is less noticeable in a pop song. The balance trick mentioned above also gets easier in MS; mute one channel in the source while listening to the same channel soloed post chain.

The mod for getting +-6dB sounds really interesting!

[Peakly]

Originally Posted by Gomez

... the GML however is always WAY out!

Maybe that's why I ended up liking it so much on the mix bus! It must be a bear to master with though.

Mychal

[edva]

I've noticed this with a lot of analogue gear. Makes me feel better about mastering ITB anyway.

[Jerry Tubb]

Originally Posted by Gomez

I'm from the "ear" school - I don't use analyzers

Ban Him!

JT

[streaky]

Originally Posted by Jerry Tubb

Ban Him!

JT

lol...

My 8200 is way off but using it in M/S does help, but I'm gonna get that mod done sounds perfect...

[streaky]

I've asked GML about the mod in db this was the reply :

We don't offer any gain modifications or production variations for the 8200; however, nearly anything is possible. A mod of this sort would entail sourcing a highly customized control in addition to a gain-set buildout. The rework itself could be relatively trivial and the calculation of values fairly straightforward, but the headache and cost is in the control. For reference: in production quantities, the existing control costs $50.

That being said, the production control could also be "slugged" -- but this will significantly (and non-linearly) alter the cut/boost taper. That would completely change the "feel" and function of this control ... not something we would recommend, but it might be acceptable for a specific installation / application.

Best regards,
Jeff
=====
Jeffrey Warren
GML, LLC.
Nashville, TN USA
George Massenburg Labs

[Paul Gold]

It's a center tapped pot which are hard to find in small quantities. In the Sontec the values of the pot and gain set resistors allow for easy modification. You could have a tech look at it. There might be an easier way.

[Gomez]

Originally Posted by streaky

I've asked GML about the mod in db this was the reply :

We don't offer any gain modifications or production variations for the 8200; however, nearly anything is possible. A mod of this sort would entail sourcing a highly customized control in addition to a gain-set buildout. The rework itself could be relatively trivial and the calculation of values fairly straightforward, but the headache and cost is in the control. For reference: in production quantities, the existing control costs $50.

That being said, the production control could also be "slugged" -- but this will significantly (and non-linearly) alter the cut/boost taper. That would completely change the "feel" and function of this control ... not something we would recommend, but it might be acceptable for a specific installation / application.

Best regards,
Jeff
=====
Jeffrey Warren
GML, LLC.
Nashville, TN USA
George Massenburg Labs

Thanks for the info Streaky

Hmmm... OK I can live with +/- 15, but I'd really like it to be at least a bit accurate - seriously, it's always WAY out.

@ MASSIVE: Did they actually did anything to your units? or they just tested them and said they were fine? if that's the case, then they should get some decent measuring equipment!

@ edva: My other 2 eq's are pretty good actually (massive passive and IBIS), and the reward is sweeter, or at least it is to my ears.

I'm considering sending the 8200 back.... but what to replace it with?

[MASSIVE Master]

Originally Posted by Gomez

@ MASSIVE: Did they actually did anything to your units? or they just tested them and said they were fine? if that's the case, then they should get some decent measuring equipment!

They tested it - Came up with the same results the tech I originally sent it to came up with and said it was within spec.

I think that was the second unit... I tried another and came up with pretty much the same thing, so I was pretty much done with them at that point.

[Gomez]

Originally Posted by MASSIVE Master

They tested it - Came up with the same results the tech I originally sent it to came up with and said it was within spec..

That is just disappointing! GML

I'm going to contact them and see what they say. Thanks John.

[cgarges]

I've had similar problems with L-R drift in my 8900 compressor. It went back to GML, got $500 worth of work done to it, and they said that it was all within spec. Not only am I hearing this thing change, but it's totally noticable on the meters, as well.

Chris Garges
Charlotte, NC

[Hpatty]

Is this a problem with every 8200, or is it hit and miss? In other words, does anybody not have this issue with these things. I've been thinking about trying one out, but now I dunno...