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Fostex T50RP Incremental Mods and Measurements - Page 76

post #1126 of 1413

Did a quick cable for the T50's, the factory one is nice, but a little long and the 1/4" connector does not work well for my portable DAC/AMP. Still waiting for the rest of my shipment to arrive, once that does I will be digging deeper in to these. Oh no real change with the new cable, just for convenience, and does not look half bad if I say so myself:tongue: it's a black and white braided cable I had left overs of on another cable mod I did a long time ago. Not top of the line, but not a blue light special either. Going to be running these headphones though the ringer for the next couple of days, so far playing the all day today, with a variety of my music I have enjoyed them. That and running everything through the external DAC is a major improvement over just using the external amp. I wanted to run these puppies "stock" for a little any way to get a feel for them before I do any modding.

 

Thanks again for all the great info on this thread, it really has made for some great reading!

post #1127 of 1413
Quote:
Originally Posted by bluemonkeyflyer View Post
 

 

I tried opening the top faux "vents" a couple of years ago using a Dremel. I thought doing so might make T50RP sound more open. This did not work for me, though. The drivers were out of control. The bass quantity significantly increased but bass quality suffered, becoming slow and boomy. The mids took a big hit and sounded muffled and too recessed due to bass bloat. The treble freqs ran for cover from the Wooly Bass Monster. 

 

For me, opening the top vents created a problem that had to be fixed instead of making the sound more open. In order to tame the bass, I had to use much more damping than usual but was never able to clear up the midrange muffle and coax the treble out of hiding. I ended up re-sealing the top vents. 

 

I think the drivers and cups across the entire RP line require damping and a pad change to flatten/elevate the FR curve at both ends and clarify the sound. In addition, some mod configs sound better with an even smaller "modified bass port" to flatten the FR and to sound more neutral; i.e. closing off all the bottom slots (vents) except for 3 to 6 mm width of just one of the four slots. The T50/40/20RP's will never have the treble shimmer and detail of dynamic drivers, at least in my experience, but the treble can be extended and elevated by an effective damping configuration. Once modified, they don't sound boring and lifeless to me, but that's based on my experience and sound preferences that may well be different from yours and others.

 

The lifeless sound quality you hear may be improved by trying half as much cotton as you initially used. You may need felt on the back of the drivers and/or a modified bass port. If these mods don't work for you and if you are willing to try other approaches, a different modification configuration may work better. nick n's MemFoam Mod, for example, sounds really good to me: good bass, clear and lush mids, and nice treble details. I still like DBV3 and the more recent mods I posted in FIMM (first post in this thread) using Paxmate lattice over balsa wood and rock wool or cotton, but without plasticine/Newplast and felt.

 

Best wishes,

 

BMF

Much Appreciated BMF,

 

Luckily these came with most of the supplies for modding, so I will give the bass port and/or heavy felt on the back of the driver a try. Rock wool seems to be a hydroponic planting supply and there is no one locally that sells it or might sell me one or two blocks, so I'll probably stick with cotton till I can find some. I would be up for the balsa lattice work as most hobby shops would carry that but I'll try the port/driver option first.

 

I will not cut out the top vents and try some of your other recommendations, there are Memfoam Wedges in the local grocery store but no Angel hair available here, I need to check the drug store for some rolled cotton to allow for a more even application and layering.

 

What is the purpose of the 4 posts in the cup, do they just support the baffle? Can they be removed without problems?

 

 

There is probably a wee bit of over expectation on my part as well... ;)

Thanks.

post #1128 of 1413
Thread Starter 
Quote:
Originally Posted by TrollDragon View Post
 

Much Appreciated BMF,

 

Luckily these came with most of the supplies for modding, so I will give the bass port and/or heavy felt on the back of the driver a try. Rock wool seems to be a hydroponic planting supply and there is no one locally that sells it or might sell me one or two blocks, so I'll probably stick with cotton till I can find some. I would be up for the balsa lattice work as most hobby shops would carry that but I'll try the port/driver option first.

 

I will not cut out the top vents and try some of your other recommendations, there are Memfoam Wedges in the local grocery store but no Angel hair available here, I need to check the drug store for some rolled cotton to allow for a more even application and layering.

 

What is the purpose of the 4 posts in the cup, do they just support the baffle? Can they be removed without problems?

 

 

There is probably a wee bit of over expectation on my part as well... ;)

Thanks.

 

The 4 rubber-capped posts make contact with the 4 corners of the driver. Closing the baffle to cup with the 4 baffle screws slightly compresses the rubber shock absorbers. This provides at least two benefits:

Decouples the baffles from the cups  

Provides positive pressure on the tightened-down baffle screws

 

Good luck!

post #1129 of 1413
Well tonight I installed the 5mm bass port mod with doublesided tape on the cup vents. Stole some of the wife's good polyester quilt batting from her stash. biggrin.gif

Cut 4 6.5x7 cm squares out of the batting, notched them for the posts and put 2 in each cup layered ontop of each other. Wow what a difference from the previous night!

I listened to them earlier out on the deck with the masking tape test bass port mod installed on the outside. Halfway through Freewill by Rush I pulled the tapes off and the bass went crazy. It's amazing how much a little mod can change up the sound.

Picked up a piece of leather to make a comfort strap and I think this is where the sound modifications will stay for a while. They probably measures like schiit but they sound good to me!

Thanks BMF for the advice!
beerchug.gif
post #1130 of 1413
Thread Starter 
Quote:
Originally Posted by TrollDragon View Post

Well tonight I installed the 5mm bass port mod with doublesided tape on the cup vents. Stole some of the wife's good polyester quilt batting from her stash. biggrin.gif

Cut 4 6.5x7 cm squares out of the batting, notched them for the posts and put 2 in each cup layered ontop of each other. Wow what a difference from the previous night!

I listened to them earlier out on the deck with the masking tape test bass port mod installed on the outside. Halfway through Freewill by Rush I pulled the tapes off and the bass went crazy. It's amazing how much a little mod can change up the sound.

Picked up a piece of leather to make a comfort strap and I think this is where the sound modifications will stay for a while. They probably measures like schiit but they sound good to me!

Thanks BMF for the advice!
beerchug.gif

That's great to hear! Congratulations on your successful mod. Your persistence and creative application of common materials at hand has paid off. If the sound is good, measurements don't matter.

I'm glad the modified bass port helped, too. By adjusting the width as little as 1 mm wider or narrower tunes the bass for your specific damping scheme.

Cheers
post #1131 of 1413
Quote:
Originally Posted by bluemonkeyflyer View Post
 

 

The T50/40/20RP's will never have the treble shimmer and detail of dynamic drivers, at least in my experience, but the treble can be extended and elevated by an effective damping configuration. Once modified, they don't sound boring and lifeless to me, but that's based on my experience and sound preferences that may well be different from yours and others.

 

nick n's MemFoam Mod, for example, sounds really good to me: good bass, clear and lush mids, and nice treble details. I still like DBV3 and the more recent mods I posted in FIMM (first post in this thread) using Paxmate lattice over balsa wood and rock wool or cotton, but without plasticine/Newplast and felt.

 

Best wishes,

 

BMF

 

Hey BMF!

 

1st, I gotta acknowledge your efforts toward this incredible friggin' thread! Amazing! (+ rep)

 

I read much of your opening post and this thread. I like DIY (do my own PC mods). It's fun in its own way. I'm really busy with home improvements and outdoor work now; plus funds are non-existent. So, I'm thinking maybe taking on a T50RP DIY project during the fall or so.

 

Couple questions related to the 2 quotes above that I grabbed from your post the other day:

 

1. Limited ability to extend treble on T50RP. While reading various threads on T50RP modding, I remember someone raving about an electronic "filter box" for modded T50RP that extends the treble. Have you looked into that and/or have any thoughts?

 

2. DBV3 and beyond. Do you have FR graphs for the DBV3 or more recent lattice type mods? I couldn't find any. Regrets if I just overlooked them.

 

Thx again!


Edited by vertical - 7/19/14 at 9:08am
post #1132 of 1413
Thread Starter 
Quote:
Originally Posted by vertical View Post
 

 

Hey BMF!

 

1st, I gotta acknowledge your efforts toward this incredible friggin' thread! Amazing! (+ rep)

 

I read much of your opening post and this thread. I like DIY (do my own PC mods). It's fun in its own way. I'm really busy with home improvements and outdoor work now; plus funds are non-existent. So, I'm thinking maybe taking on a T50RP DIY project during the fall or so.

 

Couple questions related to the 2 quotes above that I grabbed from your post the other day:

 

1. Limited ability to extend treble on T50RP. While reading various threads on T50RP modding, I remember someone raving about an electronic "filter box" for modded T50RP that extends the treble. Have you looked into that and/or have any thoughts?

 

2. DBV3 and beyond. Do you have FR graphs for the DBV3 or more recent lattice type mods? I couldn't find any. Regrets if I just overlooked them.

 

Thx again!

 

Thanks for the feedback and  "+ rep" with Thumbs Up on Post #1. Much appreciated. I hope you find something useful for your mods. I always say, "Take anyone's modification config and make it your own" by adding, substituting, and/or removing various components.

 

I have a Garage 1217 built "filter box" designed by 'solderdude' aka Frans (what a Great guy...thanks for all the help, Frans!) at diyahI also have an extra PCB board if you want to build your own. It changes the FR but, like all things audio, you would have to judge for yourself if the sound quality improves.

 

Click on "Implementing DBV #1, DBV #2...Mods" in the Table of Contents of Post #1 for information about DBV #3 beyond measurements. Short answer, "No, I don't have measurements for them. I tuned by ear comparing with DBV #2. You can refer to graphs beginning at #56 "Dmitry's Mod" for an idea of how DBV #3 et al., measure and sound.

 

Your pleasure is mine :)

post #1133 of 1413
Thread Starter 
Quote:
Originally Posted by MasterMech7777 View Post
 

Did a quick cable for the T50's, the factory one is nice, but a little long and the 1/4" connector does not work well for my portable DAC/AMP. Still waiting for the rest of my shipment to arrive, once that does I will be digging deeper in to these. Oh no real change with the new cable, just for convenience, and does not look half bad if I say so myself:tongue: it's a black and white braided cable I had left overs of on another cable mod I did a long time ago. Not top of the line, but not a blue light special either. Going to be running these headphones though the ringer for the next couple of days, so far playing the all day today, with a variety of my music I have enjoyed them. That and running everything through the external DAC is a major improvement over just using the external amp. I wanted to run these puppies "stock" for a little any way to get a feel for them before I do any modding.

 

Thanks again for all the great info on this thread, it really has made for some great reading!

 

Thanks, MasterMech7777.

 

Best Wishes for a successful and pleasing mod.

post #1134 of 1413
Quote:
Originally Posted by bluemonkeyflyer View Post
 

 

Thanks for the feedback and  "+ rep" with Thumbs Up on Post #1. Much appreciated. I hope you find something useful for your mods. I always say, "Take anyone's modification config and make it your own" by adding, substituting, and/or removing various components.

 

I have a Garage 1217 built "filter box" designed by 'solderdude' aka Frans (what a Great guy...thanks for all the help, Frans!) at diyahI also have an extra PCB board if you want to build your own. It changes the FR but, like all things audio, you would have to judge for yourself if the sound quality improves.

 

Click on "Implementing DBV #1, DBV #2...Mods" in the Table of Contents of Post #1 for information about DBV #3 beyond measurements. Short answer, "No, I don't have measurements for them. I tuned by ear comparing with DBV #2. You can refer to graphs beginning at #56 "Dmitry's Mod" for an idea of how DBV #3 et al., measure and sound.

 

Your pleasure is mine :)

 

np

 

Hmm, is that a bare board that would require me to source the components and then do a bit of soldering?

 

From looks of the FR graphs, is it fair to interpret that the DBV3 is smoother up top (treble), while the DBV2 is smoother on the bottom end (bass)?

 

Thx

post #1135 of 1413
Thread Starter 
Quote:
Originally Posted by vertical View Post

np

Hmm, is that a bare board that would require me to source the components and then do a bit of soldering?

From looks of the FR graphs, is it fair to interpret that the DBV3 is smoother up top (treble), while the DBV2 is smoother on the bottom end (bass)?

Thx

Yes to your first question. Go to the DIYAH link for details about the components.

Not necessarily to your second question. For me, no. You'll have to try them and decide for yourself. smily_headphones1.gif

Cheers
post #1136 of 1413
Quote:
Originally Posted by bluemonkeyflyer View Post

Yes to your first question. Go to the DIYAH link for details about the components.

Cheers

 

OK, downloaded the latest PDF manual for the filter board. Interesting approach. looks to be another extremely knowledgeable DIYer that is giving back to the community.  That said, I'm gonna hold off on it until I get through the headphone modding phase, then take it from there. I do appreciate the offer though ;)

 

Quote:
Originally Posted by bluemonkeyflyer View Post

Not necessarily to your second question. For me, no. You'll have to try them and decide for yourself. smily_headphones1.gif

Cheers

 

Understood, I hope to. I'll continue to read and learn until then. 

 

Thx again

post #1137 of 1413

Comfort mod: (Requires leather comfort strap & Headband Cushion

 

What it does, is if the cups have too much clamping (which if you have glasses, you will have noticed this)

 

 

It creates less space between the top of the headband and the earcups, which lets you lower the earcups, which means there's less pressure. It also makes t he headband slightly more comfortable. Edit: it doesn't fit all the way around, so i took the little fastening buttons off and fastened it directly to the leather strap.

 

 


Edited by Hapster - 7/20/14 at 2:19pm
post #1138 of 1413
Thread Starter 
Quote:
Originally Posted by Hapster View Post
 

Comfort mod: (Requires leather comfort strap & Headband Cushion

 

What it does, is if the cups have too much clamping (which if you have glasses, you will have noticed this)

 

 

It creates less space between the top of the headband and the earcups, which lets you lower the earcups, which means there's less pressure. It also makes the headband slightly more comfortable.

 

 

 

That headband cushion looks comfortable! 

 

Are those MrSpeakers' Alpha Dog pads? They're very comfortable, too. Together, they make all the difference.

post #1139 of 1413
Quote:
Originally Posted by bluemonkeyflyer View Post

That headband cushion looks comfortable! 

Are those MrSpeakers' Alpha Dog pads? They're very comfortable, too. Together, they make all the difference.

Indeed they are. Yea, who knows what fostex was thinking when they first made the headband.
post #1140 of 1413

Yeah its way too hard. I can't listen to mine for too long before it hurts the top of my head. 

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