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Author Topic: Koda T50RP Frequency Response and CSD Waterfall Plots  (Read 9764 times)

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rhythmdevils

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Re: Koda T50RP Frequency Response and CSD Waterfall Plots
« Reply #10 on: April 10, 2012, 07:34:41 PM »

Hey, I offered to send you the NAD RP18's to play with.  Working on them is a bit different though since they are open back. 

I personally think a driver slightly bigger than the T50rp, but smaller than the LCD-2 would be pretty great.  Maybe 1.5x the size of the T50rp driver.  You'd get better bass quality and detail retrieval and maybe better HF extension, but it would still keep the cost and weight down. 
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LFF

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Re: Koda T50RP Frequency Response and CSD Waterfall Plots
« Reply #11 on: April 10, 2012, 07:45:14 PM »

Hey, I offered to send you the NAD RP18's to play with.  Working on them is a bit different though since they are open back. 

I personally think a driver slightly bigger than the T50rp, but smaller than the LCD-2 would be pretty great.  Maybe 1.5x the size of the T50rp driver.  You'd get better bass quality and detail retrieval and maybe better HF extension, but it would still keep the cost and weight down.

I agree.

Did I give you a reason as to why I declined the RP18's?
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rhythmdevils

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Re: Koda T50RP Frequency Response and CSD Waterfall Plots
« Reply #12 on: April 10, 2012, 08:00:12 PM »

Yeah, no worries I didn't mention it like that, may have come off the wrong way.  Same reason I haven't gotten to them- not enough time!  It takes so long, and I'm happy with the orthos I've got tuned now.  I may try some new tricks though when they come back....
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LFF

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Re: Koda T50RP Frequency Response and CSD Waterfall Plots
« Reply #13 on: April 10, 2012, 08:04:00 PM »

Yeah, no worries I didn't mention it like that, may have come off the wrong way.  Same reason I haven't gotten to them- not enough time!  It takes so long, and I'm happy with the orthos I've got tuned now.  I may try some new tricks though when they come back....

The reason I ask is because I have had a few people offer other orthos up to mod but 1) I don't want to ruin a perfectly working pair (especially if its a vintage unit) and 2) I don't have the means to manufacture new housing if I need it. However, the biggest reason is no.1.
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Re: Koda T50RP Frequency Response and CSD Waterfall Plots
« Reply #14 on: April 10, 2012, 08:50:33 PM »

To me, the KODA^2 was a reference level can. It's truly a reference for how bad a headphone can sound. I can honestly say it is the worst sounding headphone I have ever heard.

I know, however, that others disagree.


well with this there is one point that is proven. looks do matter and makes a difference!
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omegakitty

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Re: Koda T50RP Frequency Response and CSD Waterfall Plots
« Reply #15 on: April 11, 2012, 02:14:00 AM »

Hey, I offered to send you the NAD RP18's to play with.  Working on them is a bit different though since they are open back. 

I personally think a driver slightly bigger than the T50rp, but smaller than the LCD-2 would be pretty great.  Maybe 1.5x the size of the T50rp driver.  You'd get better bass quality and detail retrieval and maybe better HF extension, but it would still keep the cost and weight down.

If you get around to the RP18 I am very interested in seeing what can be done. I had a pair with some dampening done (maybe only 1 or 2 layers of 1 mm felt) and they had nothing over 6 KHz. And I do not mean this in a normal headphone hyperbolic way. They literally had 0 frequencies past that. I think the pair I sold went through 3 owners in a months period before ending up in cetoole's headphone void (and I believe someone has them on loan, or maybe not, been a while since I asked him).
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rhythmdevils

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Re: Koda T50RP Frequency Response and CSD Waterfall Plots
« Reply #16 on: April 11, 2012, 02:25:07 AM »

I've worked on them a fair amount already, but they are currently with dBel84 for wiring repairs.  I have both the mylar and kapton versions and both are capable of treble on par (or better, it's been awhile) than the LCD-2 depending on the damping.  I haven't gotten the upper midrange to my liking so far.  But I'm a picky bastard in that way.  They definitely extend past 6khz that's for sure.  Sounds like your pair may have fallen out of grace with the ortho Gods. 

For a look at what they are capable of measurement wise, check out Kabeer's modded Aiwa HP500 which won 1st place in Innerfidelitiy's DIY contest.  It's a variant of the same driver. 
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omegakitty

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Re: Koda T50RP Frequency Response and CSD Waterfall Plots
« Reply #17 on: April 11, 2012, 02:27:01 AM »

I've worked on them a fair amount already, but they are currently with dBel84 for wiring repairs.  I have both the mylar and kapton versions and both are capable of treble on par (or better, it's been awhile) than the LCD-2 depending on the damping.  I haven't gotten the upper midrange to my liking so far.  But I'm a picky bastard in that way...

For a look at what they are capable of measurement wise, check out Kabeer's modded Aiwa HP500 which won 1st place in Innerfidelitiy's DIY contest.  It's a variant of the same driver.

Ok so there are two distinct versions of the RP18 then?

And am I correct in thinking it is a rebadged T50v2 and not a T50v1? It has been so long since I owned them/ortho modded.

edit: yeah I am wondering if my pair were broken. My memory isn't quite so good on these, but I thought someone else around the time said they weren't able to do much with an RP18. I'll see if cetoole was able to get anything more out of them. I think the last time we talked he said he was able to eek more mids and treble out of them, but still very very dark.
« Last Edit: April 11, 2012, 02:29:03 AM by omegakitty »
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rhythmdevils

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Re: Koda T50RP Frequency Response and CSD Waterfall Plots
« Reply #18 on: April 11, 2012, 02:33:39 AM »

Actually it looks like it's based on the T50v0 and yeah there are 2 versions.  One has a mylar diaphragm, which is closer to the T50 sound, and is pretty decent stock.  The other has a kapton diaphragm and has the craziest bass you'll ever hear in a headphone.  Like Beats and Audeze had a baby.  Of course the goal is to bring it in check with the right mods.  I had more luck on the mylar version because it requires less damping.  It would be fun to mod the kapton for extreme bass and send it to Tyll with a b logo wrapped around the headband :-)

The Wikiphonia page has some good info.
« Last Edit: April 11, 2012, 02:38:20 AM by rhythmdevils »
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omegakitty

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Re: Koda T50RP Frequency Response and CSD Waterfall Plots
« Reply #19 on: April 11, 2012, 03:13:09 AM »

Yup mine definitely had that uber thumping bass sound. I'd love to see the FR/CSD of those stock  :'(
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