solderdude
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Post by solderdude on Oct 23, 2018 20:54:30 GMT
The goal is to reduce the airflow. A smaller hole may well work just as good. Would recommend to keep the foam in the cups in place though even though the chances of dust getting in the driver may be much smaller using the flanges.
Interesting idea ...
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Post by Mr Trev on Oct 24, 2018 1:22:32 GMT
My plan was just to use adhesive labels cut into circles with different sized holes punched in them (I have a leather punch with 6 different sizes). Never thought about using an old eartip as a sort of plug. Not in any hurry to pull the felt off and start experimenting however (I'm a lazy, lazy man and am pretty happy with the SQ ATM. Also, I have a horribly short auditory memory - and no way of measuring either - so I'm not sure if I'd even remember which sounds better)
BTW, I never had any intention on removing the foam, I have no problem with the way it looks
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Post by denonic on Oct 24, 2018 11:25:01 GMT
Just got your felt and tape in the mail today and applied the mod. Compared to the 2mm synthetic felt I was using before, this felt feels much stiffer. The tape is also incredibly thin so its as non intrusive as possible. Used a hole punch that was the perfect size to push the hole out of the tape.
Where my original felt almost completely removed bass, this balanced it just right.
I did one side first to do a by ear comparison. If you like the feeling of bass moving air into your ear, don't do this mod. Keep it stock and be happy. If you'd rather have the bass be in line with the mids rather than booming, while also removing some excessive warmth, this mod is the ticket.
Even after you've done this mod, you will feel the bass if you have an amp driving it hard enough. But these are my work pair that I drive soft enough to not disturb my office mates while still being able to hear people call out to me. Perfectly balanced.
I kept the felt green just for that extra O.G. creatology rep haha..
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solderdude
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Post by solderdude on Oct 24, 2018 18:46:42 GMT
Good to hear it arrived and works well.
I need to try some other materials some day that are easier to obtain. Having a bit too much hay on the pitchfork a.t.m. though.
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Post by Mr Trev on Nov 29, 2018 19:46:46 GMT
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solderdude
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Post by solderdude on Nov 30, 2018 16:59:43 GMT
When he has one of those felt discs he can send it to me and I can measure it's effect. Have no head-fi account so cannot ask myself.
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Post by Mr Trev on Nov 30, 2018 17:59:38 GMT
When he has one of those felt discs he can send it to me and I can measure it's effect. Have no head-fi account so cannot ask myself. From what I gathered those are just the type of felt pads that you put on the bottom of chair legs so they don't scratch the floors - with a hole in the middle. They are pretty dense felt from what I remember so I have to imagine the any audible change is due to the hole rather than the felt itself
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solderdude
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Post by solderdude on Dec 1, 2018 8:54:01 GMT
The thickness of the felt and exact hole diameter is important. It's effect is similar to making a smaller hole or sticking something over the driver hole that has a similar 'acoustic resistance'. Just like sticking an IEM plug inside the hole.
The hole diameter and length are important. The chair felt pads I have/use all are fully closed. There is no hole in any of them and are glued on a plastic thing with a nail in it or a metal thing with spikes. One would have to know the exact make and model to mimic it.
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Post by Mr Trev on Dec 1, 2018 17:29:58 GMT
The local hardware stores here do sell those pads in self-adhesive form. As for as the hole goes… I can borrow a leather hole punch that does 5 or 6 different sizes, not sure what else could be used. I asked the guy that posted the mod what type of felt he used and how he punched the holes. If/when I get that info back I'll pass it along in case you're willing to test it out
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solderdude
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Post by solderdude on Dec 2, 2018 9:34:51 GMT
I have leatherpunches.
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Post by Mr Trev on Dec 2, 2018 18:13:56 GMT
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solderdude
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Post by solderdude on Dec 2, 2018 22:09:52 GMT
I have a similar punch and Ikea is not far away from here. 3.5, 4 and 4.5mm This method might be 'safer' and easier to reproduce than trying to find the same felt or foam I have been using.
When I have the materials I will do some measurements. Probably end of next month or so.
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Post by denonic on Dec 6, 2018 2:14:19 GMT
I got a miniDSP EARS in the other day and borrowed a friends stock 58x to measure against your felt mod. Here is the left channel comparison. This is using SBAF's compensation as the supplied one looked extremely treble skewed in everything I measured but I suspect it might be due to the Pinna material and screws preventing proper sealing every time. Just happy I can get consistent results and can do referenced comparisons.
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Post by solderdude on Dec 6, 2018 9:44:22 GMT
SBAF compensation is a lot better than the EARS one for sure. Marv did a good job. It looks like your felt mod has about -5dB at 100Hz opposite mine = -3dB at 100Hz opposite 1kHz. To tune the felt you can scrape off some material using a knife or bend and loosen the material before sticking it on there. The felt I used is quite old and may not be similar to what's available now. Another idea is to make small holes in the felt. Will be trying out the thick felt with hole mods in due time and encorporate my findings in the pdf.
The article shows how different materials can be used to create tonal balance changes. I would encourage folks to do this. To my horror I have seen people using felt with sticky backs (out of convenience ?) which totally blocks air flow or much thicker felt or very different ones. I am not surprised some think the mod is bad...
The EARS is a great tool with the proper compensation and of great help when doing mods.
Between 1kHz and 7kHz differences come from the used Pinna and is where the EARS is more 'accurate' than my measuerements.
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Post by denonic on Dec 7, 2018 0:21:25 GMT
The felt I used was the one you sent me haha. I think the difference may be that I used the tape with a perfectly sized hole punch so it seals all the way to the hole. Compared to your documentation there was less tape toward the centre. Might cut some of that tape off and measure afterward.
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