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Post by gar381 on Feb 9, 2019 17:20:00 GMT -6
Nice looking work dogears. Best of luck with this  Gary |
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Post by matt@IAA on Feb 12, 2019 10:20:38 GMT -6
Hey guys, can I get some votes on center frequencies? A buddy of mine suggested to spread the mids down a bit and give a tighter grouping in the lows. The highs are pretty well set.
Here's what I can do with available caps
fc
16k
11k
9.1k
7.5k
6k
5k
4.2k
3.5k
3k
2.4k
2k
1.6k
1.35k
1.1k
750
600
500
400
350
300
250
200
165
135
110
90
75
60
50
40
33
Here is my initial selection:
Mid - 400, 600, 750, 1.6k, 3k, 5k
Low - 33, 50, 110, 200, 300, 400
Here was his suggestion:
Mid - 250, 350, 750, 1.35k, 3.5k, 5k
Low - 50, 75, 110, 135, 200, 250
Thoughts?
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Post by Blackdawg on Feb 12, 2019 11:05:14 GMT -6
Id agree more with your friends Mid selection for sure. What are the HF selections? That would make a difference in what to consider given then last two MF selections.
For the lows Id consider: 40 60 110 165 200 250
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Post by matt@IAA on Feb 12, 2019 11:44:16 GMT -6
Highs are kind of limited by the cap availability.
Right now it’s -
16.4, 11, 9.1, 7.5, 6, 5
But basically anything on that list can be done, six per band.
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Post by christopher on Feb 13, 2019 12:16:42 GMT -6
Lows can be a shelf or peaking? I rarely like to boost below 60hz (60 is a go-to for me) but if I do I’m looking more for 40hz girth. I used to like 50hz for kicks, but doing live sound I found girls will move their hips at 63hz, yet just stand around talking and drinking at 50hz. Must be a resonance there. Also a little higher up on the low shelf would allow to reach for 300-400 ish (350?) and subtract, while also boosting the mid range. I get bummed losing a midrange EQ node just to suck out some garbage. Also wanted to say, I like the triangles quickly showing what range the EQ is in. Looks great, wish I had money to throw at it.
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Post by matt@IAA on Feb 13, 2019 12:40:49 GMT -6
Yeah lows and highs are shelf or peaking.
So maybe the 33 Hz point is a bit much. Probably go to 40/60 instead of 33/50. I do like the 400 on the low for the reason Christopher mentioned.
It gets tough. Decisions, decisions. Maybe I'll tell folks to pick their own, leave the faceplate blank and write it in. Or anyone who wants non-standard points gets a wood faceplate so I can burn it with the laser - haha.
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Post by Blackdawg on Feb 13, 2019 12:44:15 GMT -6
If getting up to 400 is needed, which I fully understand and agree with at times.
Id do: 40 60 110 250 400 600
This give overlap which is nice. And considering you Q is very broad anyways going wider with the freq selection isn't going to hurt anything.
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Post by mulmany on Feb 13, 2019 16:24:27 GMT -6
I like having overlap in the 300/400 rang for low to mid. I would bring the highs down a notch to get that obnoxious 4k into the hi band.
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Post by Blackdawg on Feb 13, 2019 17:11:46 GMT -6
Yeah highs could be: 16 9.1 6 4.3 3 2
This would also cause good over lap with the mid band
So you'd be at
Low: 40 60 110 250 400 600
Mid: 250 350 750 1.35 3.5 5
High: 2 3 4.3 6 9.1 16
That gives you a lot of flexibility and control from 750-6k pretty much.
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Post by matt@IAA on Feb 13, 2019 19:18:25 GMT -6
This is awesome feedback.
The only points I'm hesitant on in your suggestion is the 600 and 11k.
I'm wondering if I wouldn't end up wanting to trade the 600 for something lower. I always feel like that 75-135 range is really sensitive to small tweaks if you wanna shove something up.
The other point I feel like I may miss is the 11k - it's my go-to shelf on snare.
What about:
Low: 40 60 90 135 250 400
Mid: 250 350 750 1.35 3.5 5
High: 3 4.3 6 9.1 11 16
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Post by mulmany on Feb 13, 2019 20:38:30 GMT -6
This is awesome feedback. The only points I'm hesitant on in your suggestion is the 600 and 11k. I'm wondering if I wouldn't end up wanting to trade the 600 for something lower. I always feel like that 75-135 range is really sensitive to small tweaks if you wanna shove something up. The other point I feel like I may miss is the 11k - it's my go-to shelf on snare. What about: Low: 40 60 90 135 250 400 Mid: 250 350 750 1.35 3.5 5 High: 3 4.3 6 9.1 11 16 What if you push the mids up and start at 350, 550, 750, ect... |
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Post by matt@IAA on Feb 13, 2019 20:40:22 GMT -6
This is awesome feedback. The only points I'm hesitant on in your suggestion is the 600 and 11k. I'm wondering if I wouldn't end up wanting to trade the 600 for something lower. I always feel like that 75-135 range is really sensitive to small tweaks if you wanna shove something up. The other point I feel like I may miss is the 11k - it's my go-to shelf on snare. What about: Low: 40 60 90 135 250 400 Mid: 250 350 750 1.35 3.5 5 High: 3 4.3 6 9.1 11 16 What if you push the mids up and start at 350, 550, 750, ect... Design by committee haha Low: 40 60 90 135 250 400 Mid: 350 500 750 1.35 3.5 5 High: 3 4.3 6 9.1 11 16 Going once.... When we get into production all contributors can get a discount as a design fee! |
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Post by mulmany on Feb 13, 2019 21:01:27 GMT -6
What if you push the mids up and start at 350, 550, 750, ect... Design by committee haha Low: 40 60 90 135 250 400 Mid: 350 500 750 1.35 3.5 5 High: 3 4.3 6 9.1 11 16 Going once.... When we get into production all contributors can get a discount as a design fee! When you actually stop and think about the freq points you use and those you wish you could use it's a bit daunting. It really ends up being determined by the design goal. We all have our preferences... Mine is shaped by 4band parametric eq on live desks. I carve out 400, 750-850, 4k, 6.7k and boost 75-90, 500-650, 3k, 10k. |
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Post by matt@IAA on Feb 13, 2019 21:04:23 GMT -6
Yes... same. I start getting stressed when I think about uses...coming at it from a mixing perspective here. But I’m constrained by space and switches and standard cap values.
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Post by matt@IAA on Feb 13, 2019 21:48:28 GMT -6
mulmany man that's eight bands. So you need to start over  If that's the objective, then all the "key" frequencies you need are there. You just have to pick three at a time. Low: 40 60 90 135 250 400 Mid: 350 500 750 1.35 3.5 5 High: 3 4.3 6 9.1 11 16 For me, bass and kick are going to use the 40/60/90, snare is the 135 for boost. Mid, 350/500 for cut boxiness in a kick, 500/750 maybe to suck some donk from a snare. High, 9.1k for mallet on kick, 11k shelf for snare all the time. Overheads... boost that 90 or 135, cut 350/500/750 depending, and boost 11k or 16k. I don't use a ton of EQ on bass, one of those low points will be fine and the high has lots of options for a cut. For distorted guitars... cut maybe 135, maybe another cut at 350, then a third at 3k or 6k. I tend to use more notch-y EQs for that though. I dono. I am actually tentatively good with that current setup. It seems flexible for me, but I would love more opinions.
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Post by Blackdawg on Feb 13, 2019 22:59:16 GMT -6
What if you push the mids up and start at 350, 550, 750, ect... Design by committee haha Low: 40 60 90 135 250 400 Mid: 350 500 750 1.35 3.5 5 High: 3 4.3 6 9.1 11 16 Going once.... When we get into production all contributors can get a discount as a design fee! I think that's a great set. Keeps it pretty flexible all around |
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Post by mulmany on Feb 14, 2019 11:47:16 GMT -6
mulmany man that's eight bands. So you need to start over If that's the objective, then all the "key" frequencies you need are there. You just have to pick three at a time. Low: 40 60 90 135 250 400 Mid: 350 500 750 1.35 3.5 5 High: 3 4.3 6 9.1 11 16 For me, bass and kick are going to use the 40/60/90, snare is the 135 for boost. Mid, 350/500 for cut boxiness in a kick, 500/750 maybe to suck some donk from a snare. High, 9.1k for mallet on kick, 11k shelf for snare all the time. Overheads... boost that 90 or 135, cut 350/500/750 depending, and boost 11k or 16k. I don't use a ton of EQ on bass, one of those low points will be fine and the high has lots of options for a cut. For distorted guitars... cut maybe 135, maybe another cut at 350, then a third at 3k or 6k. I tend to use more notch-y EQs for that though. I dono. I am actually tentatively good with that current setup. It seems flexible for me, but I would love more opinions. I was just listing my go too for everything, not a single source! I think the freq look great. |
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Post by matt@IAA on Feb 25, 2019 13:55:08 GMT -6
So I got a bunch of feedback offline as well, and it was so hopelessly muddled (ha!) that I decided... I'm going to leave the frequency points as-is. Everyone wanted to tweak something, but when you sorted the "keep" vs "change" votes by band, each band as-is won. That being said, changing out frequency points is just a matter of swapping some caps and making a different face plate. So I figure, if someone wants a custom one they get a wood plate overlay.
I also laid out a four band bad boy last night. Same idea except two mid bands instead of one. I can't fit two channels of it in a 1RU so I could either do a 2 RU (in which case... why not do even more bands amirite?!) or I'm thinking I could offer it as a modular channel strip. Mic pre, pick your EQ (I have two discrete RC EQs), toss a line amp on there, etc. Anyway. Maybe more fun to come soon.
Thanks everyone for the input.
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Post by matt@IAA on Mar 24, 2019 15:36:01 GMT -6
Finished laying out the resistor ladders for some other versions. Basically I can lay out any and gain values desired, but I kept the "Q law" that I had going (increasing up to a max of ~1.2 at 12 dB) and made a mastering version with .5, 1, 1.5, 2, 3 dB amounts and a finer tune version (I have a buddy who swears he never wants more than 6 dB during mixing) at 1, 2, 3, 4, 6 dB steps.
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Post by Blackdawg on Mar 30, 2019 2:42:25 GMT -6
Finished laying out the resistor ladders for some other versions. Basically I can lay out any and gain values desired, but I kept the "Q law" that I had going (increasing up to a max of ~1.2 at 12 dB) and made a mastering version with .5, 1, 1.5, 2, 3 dB amounts and a finer tune version (I have a buddy who swears he never wants more than 6 dB during mixing) at 1, 2, 3, 4, 6 dB steps. Cool! Looking forward to seeing it! |
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Post by Vincent R. on Apr 11, 2019 19:21:17 GMT -6
Is this similar to the EQ on the CS2?
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Post by matt@IAA on Apr 11, 2019 19:43:05 GMT -6
Is this similar to the EQ on the CS2? No, the CS EQ is a modified Baxandall type design with a pot to set gain by swinging the filter in or out of the feedback loop on an inverting op amp. Frequency is changed by switching caps. This design is using a bridged T filter, so the gain is switched and each gain point is a fixed filter, either inside the feedback loop for boost, or outside it for cut. The frequency is changed by changing the capacitors. A little more complicated, but also sounds different. This guy also has a shelf on the high and low bands. Also, the passive bands on this one are separated by discrete buffers, which add a unique tone to the circuit. More distortion than the op amps do for sure. However, in both I’m using the same op amps, and the same output transformers, so the overall tone should be similar. |
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Post by matt@IAA on May 12, 2019 20:18:32 GMT -6
I’ve dubbed this the V2 equalizer.
Here’s a bit from the manual:
Customization options include:
Output transformer (steel core or nickel, or whatever else you may like)
Op amps (990 footprint)
Center frequencies
Boost/cut amounts (0.25, 0.5, or 1x listed dB range)
Custom face plates
I’m getting ready to order metalwork for it, as it’s been performing beautifully.
I also have the prototype back in my lab and available for demo, if anyone on here wants to give it a spin. It still has a wood faceplate without a metal backer so it can’t be rackmounted, just FYI.
I’m looking at probably $1750 for the stereo unit when finished, and it’ll be in stock in about three months. Metalwork usually takes 8 weeks for a new design.
I typically order 5 cases on first round products, but there’s been some interest here. I will order more if needed,
Anyone who reserves one here, or on PM or by sending me an email (matt at Iron Age Audioworks dot com) is good for a unit at $1500. Y’all gave me such good feedback and really this community is awesome, so I’m glad to give an RGO ( design committee) discount. I’m not taking any money til I have units to ship and there’s no obligation - this is just to help me gauge my batch size.
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Post by pope on May 14, 2019 16:01:31 GMT -6
Looking good! |
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Post by Blackdawg on May 14, 2019 16:36:30 GMT -6
Super cool!
Will be looking at this later for mastering. I like how you can get it in different gain steps.
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