Originally Posted by Mr. Bubbles
I own both the TW3 and TF1000. Though it has been a while since I listened to either one, I don't recall the TW3's sounding lifeless or lacking high end. My first is to wonder do both cabinets sound the same and are you playing them on the same equipment you are using for the other speakers, or is it different gear? I don't have a schematic for that crossover to look for likely causes, or know exactly what parts you used in the upgrades you performed. that is probably here in this thread somewhere i am sure.
I am playing all of the speakers with the same equipment. 2 Outlaw monoblocks and an adcom 2 channel preamp. There is no type of equalization on the amp other than treble, midrange and bass tone control knobs which are all set to the center position. Both of the speakers are exhibiting the impaired treble.
Here is the schematic:
DCM TW3 Schematic.zip 466k .zip file
I replaced all of the electrolytic with Erse caps and all of the mylar caps with the Panasonic ECWF(A)'s which Jamie recommended based on discussions with Steve E. Pictures of my finished board are in Post 1063 on this page: http://www.avsforum.com/t/652191/whatever-happened-to-dcms-steve-eberbach/1050
Also on that same page in post 1058 I talk about differences in my board and the other one's I've seen posted. I also show all of the markings for the resistors on my boards.
I noticed on the schematic that there was a change made on March 28, 1984 to the board to increase treble output. I can't figure out how to read the schematic in relation to my board to see if I have the "old" or "newer" version of the board with the changes.
Just a thought here, do resistors go bad? Is it possible that there is an issue with some of these in the high frequency signal path?
Originally Posted by Jamie Hauser
I've never thought that the high frequencies are muted with my TW3's. Have you adjusted the tweeter level control on the back of each speaker? Have you tried to measure their output with at least a sound pressure meter and test tones. If you really want to get serious look at getting Room EQ Wizard software and a Behringer ECM8000 Microphone to really know what's going on.
I have played with the treble control in the back of the speakers but they still sound muted even at their highest setting. I have not put a SPM on them. I have run test tones through them just to see if I could hear any missing tones. I used these test tones http://www.ronelmm.com/tones/
As far as I could tell all of the tones were coming through the speakers. I will get a SPM and try to get some more objective data to see if/where there is a drop off in output levels.
I've never used a sound meter before. Am I correct in assuming I would set it to a referenced decible level, then run different tones through the speaker and record the decibel levels that the tones produce?
Originally Posted by DCMlover
I can't comment on the TW3 but I can compare the TW to the 1000's and I liked the TW better. The 1000's were shy on bass. They imaged good, and the mid was nice and sweet. It seems like the bass was nice and low, but was very muted at lower volumes. They started to sing when you turned them up quite a bit.
That's exactly the same impression I have about my 1000' s. Good imaging, crystal clear high's and mid's and lacking some in the bottom end. They definitly come to life when they get louder. ( I replaced the electrolytics the other day and that brought up the bass and balanced them out somewhat but the bass is still low.)
To my ear the 1000's have very similar tonal qualities to the TW7's in the mids and highs. My TW3's seem to be the reverse of the 1000's. The TW3's that I have are great in bass, and mids but lacking in the highs.
You mention that you like the TW's better than the 1000's. Is that because the TW's have the same tonal qualities in the highs and mids as the 1000's but with better imaging and better bass?