XRK971's Folded MLTL - TC9FD

Status
Not open for further replies.
Jump to Latest
P

pcgab

Member
Joined 2014
#1
http://www.diyaudio.com/forums/full-range/232778-fostex-fe83en-box.html#post3427671

I had a pair of spare tc9fd's, and some cheap terminal cups and port tubes laying in the closet so I decided to whip up a pair of the above linked design on recent afternoon.

Was able to apply a bsc with 1mH inductor and 5ohm resistor. I got those values from some thread that I can't seem to find atm.

I used a ~2" ID port tube with a length of ~2.75" iirc. There is a bit much bass, so I put a tiny bit of poly batting in the port and it sounds much better.

I'm curious if more/less inductance/resistance might help tame the bass a bit, or if I should just leave the stuffing in the port. As these are likely to end up on my bench for near field, and placed near a back wall, I am happy to keep the stuffing.

They sound really nice, from very near field (desktop) to relatively near field, ~1.5-2m.

I left the bsc mounted on the top of the box to make any mods nice and easy.
 

Attachments

  • IMG_3876.JPG
    IMG_3876.JPG
    637.1 KB · Views: 317
  • IMG_3964.JPG
    IMG_3964.JPG
    585.1 KB · Views: 244
  • IMG_3966.JPG
    IMG_3966.JPG
    639.7 KB · Views: 217
  • IMG_3965.JPG
    IMG_3965.JPG
    665.5 KB · Views: 230
#2
Nice work Pcgab! I don't think I have seen nicer boxes for a single pair of TC9's! You can also add more stuffing inside the length of the TL. Denser fill will attenuate bass. Most of the time people say they want more bass. Your vent is rather large in diameter and shorter than the 1.75in x 3in long I recommended. This will give you exaggerated bass, albeit at a higher frequency. So you can either make the port longer, or decrease its area with stuffing to flatten it. Changing values of BSC will only after the high frequency attenuation - not the low end. I suspect you have a lot of bass at 80Hz, making port longer or constructed will bring it to 55Hz.
 
#4
xrk971 said:
Nice work Pcgab! I don't think I have seen nicer boxes for a single pair of TC9's! You can also add more stuffing inside the length of the TL. Denser fill will attenuate bass. Most of the time people say they want more bass. Your vent is rather large in diameter and shorter than the 1.75in x 3in long I recommended. This will give you exaggerated bass, albeit at a higher frequency. So you can either make the port longer, or decrease its area with stuffing to flatten it. Changing values of BSC will only after the high frequency attenuation - not the low end. I suspect you have a lot of bass at 80Hz, making port longer or constructed will bring it to 55Hz.
Click to expand...

Thank you! I had some spare ~12mm baltic birch on hand so it was a quick, fun little build.

I may try a bit more stuffing, for the time being they sound quite nice with a tiny bit of stuffing in the port.

I was comparing these to my FF105WK Tl's (Woden Falcon) last night. I've always enjoyed the Falcon's a good bit, but in direct comparison they are much too bright on axis. It's funny that I've not noticed the brightness with the FF105wk's until I compared them to the TC9FD.
 
Last edited:
#5
pcgab said:
Thank you! I had some spare ~12mm baltic birch on hand so it was a quick, fun little build.

I may try a bit more stuffing, for the time being they sound quite nice with a tiny bit of stuffing in the port.

I was comparing these to my FF105WK Tl's (Woden Falcon) last night. I've always enjoyed the Falcon's a good bit, but in direct comparison they are much too bright on axis. It's funny that I've not noticed the brightness with the FF105wk's until I compared them to the TC9FD.
Click to expand...

The FF105WK's have a peak at 7kHz that may be sounding bright - also, do you have BSC on the Falcon's? That can change the sense of brightness a lot with a larger resistor value.
 
#6
I don't have a bsc on the Falcons.

Any thoughts on what I should try, I've got some <1mH inductors around here, a pair of 1.5's, then some larger ones. And lots of resistors.

I bet I can find a bsc calculator online......
 
Status
Not open for further replies.
Top Bottom