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Just listened to some Fostex T50RPs today... WOW! - Page 282

post #4216 of 10678

mrspeakers, how do you account for the difference b/n the FR curves and the cascades? Specifically, I'm thinking about the 3-5K dip in the cascades that isn't present in the FR curves. 

post #4217 of 10678

The cascades are a narrower frequency range than the linear plot because bass waterfalls obscure mid and high details.  Because of this the waveform looks quite different.  Also, the vertical scale is exaggerated in the waterfall, which makes the peaks and troughs look considerably different than they do on the full range plot.

post #4218 of 10678

I see what you mean. I didn't pay attention to the graph's scales. Thanks. 

post #4219 of 10678

Just finished modding my T50RPs to a config similar to the BMF 6 v2 (Light), it sounds good but something is wrong something is fatiguing my ears but I'm not sure how to go about figuring out what it is confused.gif.

 

I put about 10 grams of plasticine in each baffle dimpled, put dynamat strips in the sides of the cup and covered that and the 1 inch rectangle with SIlverstone Acoustic Foam, as well as the top of the Pillar thing. Dynamat around the driver earside ( I have no adhesive felt could this be messing it up?), and Gauze under the the posterior part of the pads.

 

 

 

Also these headphones grip right on my jaw muscle and joint it's a bother bother any way to fix that?

 

In any case amazing change the sound from stock which I decided to stick to  for a few days to be able to notice the difference, keep up the good work guys, I'm gonna keep tweaking! 

 

 

Edit: Woooo not a Junior Head-Fier anymore!

post #4220 of 10678

Originally Posted by drez View Post

Awesome research there, thanks for posting!


Well, we all aim at the same goal! Anyways, I've gotten a hold of him and I've got a sample of C5g heading my way. The good news is what he just told me: "The density of C5g  is about 1.8 g/mL, so considerably less than tungsten putty! And C5g works by frictional losses (converting vibrations to low amounts of heat) so mass is not an issue. A layer (without screwdriver holes) up to several mm thick is all that is necessary for your application, I would guess"

 

So I can see a bright future in only a few mm of C5g in the baffles and acoustipak foam in both the baffles and cups, better SQ and very light to boot regular_smile%20.gif


Edited by leeperry - 10/25/11 at 6:53pm
post #4221 of 10678
Fatiguing in what way/frequency range? In the absence of felt, you could try one or two layers of gauze over the ear side Dynamat. Maybe try a different source or amp? Are the bass ports unblocked with the black felt in place? You could carefully remove the black felt over the bass ports and tune from the outside with electrical tape over some of the vent slots. If that does not help, you can put them back with rubber cement.

Probably unrelated but did you remove the dust cover felt surrounding the drivers on the ear side before applying the Dynamat? Is the dust cover still over the driver on the ear side?

Counter intuitive but you could try removing the silverstone over the central compartment (pillar).

The Dynamat on the sides of the central section at the bottom of the cups and beneath the silverstone probably adds nothing. You could take it out and put the silverstone back in place.

I have no fatigue but our ears may be different. Good luck tweaking.

Quote:
Originally Posted by theguatemalian View Post

Just finished modding my T50RPs to a config similar to the BMF 6 v2 (Light), it sounds good but something is wrong something is fatiguing my ears but I'm not sure how to go about figuring out what it is confused.gif.

 

I put about 10 grams of plasticine in each baffle dimpled, put dynamat strips in the sides of the cup and covered that and the 1 inch rectangle with SIlverstone Acoustic Foam, as well as the top of the Pillar thing. Dynamat around the driver earside ( I have no adhesive felt could this be messing it up?), and Gauze under the the posterior part of the pads.

 

 

 

Also these headphones grip right on my jaw muscle and joint it's a bother bother any way to fix that?

 

In any case amazing change the sound from stock which I decided to stick to  for a few days to be able to notice the difference, keep up the good work guys, I'm gonna keep tweaking! 

 

 

Edit: Woooo not a Junior Head-Fier anymore!

post #4222 of 10678

Drat, looks like I ordered some weird siliconous rubber sheet instead of speaker felt DX".  No idea what this stuff is used for - invoice says "rubber feet" but the sheet isn't even thickness...

looks like I will need to place another order, but I recon this paxmate should do very well in meantime.

I think from memory felt damping might act differently to paxmate as it presents a greater surface area to the driver.  I never did take that speaker design course (maybe there is an ebook?)

Needs more solder for b22 anyways, also need to order "electronics for dummies" as fail insurance.

post #4223 of 10678

If only this weren't so expensive, it'd be one of the few times I'd actually want to buy a textbook... 

http://www.amazon.com/Loudspeaker-Headphone-Handbook-Third-Borwick/dp/0240515781/ref=sr_1_1?ie=UTF8&qid=1319598767&sr=8-1

post #4224 of 10678

Just quick modded a thick layer (4mm) of gauze onto the dynamat foil and it fixed my problem it was the vocals and the guitars that were too shirll and harsh but the gauze atenuated it to a very pleasing noise. I guess maybe I was getting harsh reflections off the foil on the dyanamat.

 

Thanks fo the tip!

post #4225 of 10678
Quote:
Originally Posted by Armaegis View Post

If only this weren't so expensive, it'd be one of the few times I'd actually want to buy a textbook... 

http://www.amazon.com/Loudspeaker-Headphone-Handbook-Third-Borwick/dp/0240515781/ref=sr_1_1?ie=UTF8&qid=1319598767&sr=8-1

While not specific to headphones, most of the high-level concepts are relevant and the price is way lower.  I refer aspiring speaker designers to this all the time.  It's best if you are technically comfortable through math/science.  

 

http://www.amazon.com/Loudspeaker-Design-Cookbook-Vance-Dickason/dp/1882580478/ref=pd_sim_b_4

 

 

post #4226 of 10678


Augh! No more posts like this please... It gives me the itch please wait 2 seconds for an uncompressed image, or press Ctrl+F5 for original quality page

Quote:
Originally Posted by geetarman49 View Post

5. soundwise for me, he500 > lcd-2 > th900

 



 



 

post #4227 of 10678

Mr.Speaker those graphs (and the gumption to set up the rig) are awesome. Any chance for a measurements of a single variable in the tuning of the Fostex or a pre/post mod comparison? 

 

post #4228 of 10678
Quote:
Originally Posted by Armaegis View Post

If only this weren't so expensive, it'd be one of the few times I'd actually want to buy a textbook... 

http://www.amazon.com/Loudspeaker-Headphone-Handbook-Third-Borwick/dp/0240515781/ref=sr_1_1?ie=UTF8&qid=1319598767&sr=8-1

That book is insane and it may be in your local library. You can get a taste of it on Google books. Check page 598. 

http://books.google.com/books?id=9DeZqnsjetgC&pg=PA585&source=gbs_toc_r&cad=4#v=onepage&q&f=false

post #4229 of 10678

what's better, micropore or transpore on the back of the driver?

post #4230 of 10678

How do the modded T50RP's stack up against the Stax range, anybody got both?

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