vintage_dog wrote:i love the 403A OB, but, on some passages i wish i get a little more extension on the highs. i'd like to experiment with a few tweeters. any suggestions on tweeters that will match the Altecs?
any tips on placement (of tweeter) on the OBs?
thanks
vintage_dog wrote:thanks Joseph. i got a loaner vintage horn from john poscablo and will experiment with it. will check-out your site for more info.
Audioboy wrote:already got a pair.
Here's a pic of horn (Dai-ichi PT-6) installed on my OB.
L-Pad and 1uf siemens porcelain cap (from john p.)
setup1 wrote:Audioboy wrote:already got a pair.
Here's a pic of horn (Dai-ichi PT-6) installed on my OB.
Congratulations! This is the DIY spirit I've been waiting for. That is the Dai-ichi tweeter I saw during my last visit, could you share some comments on the unit?L-Pad and 1uf siemens porcelain cap (from john p.)
In case you experience some harshness that can't be tamed by the L-pad, try using a .5-.75uf cap instead. Better yet if you have 4 of those Siemens, connect a pair in series. Joel and I have been exchanging notes about cap values and so far we agree that .68uf seems to be a good value for super tweeter duty for FR drivers that go up to over 10khz. But if you're happy don't mess with it.
JE
Audioboy wrote:i was able to get from john poscablo a pair of .68uf caps which i immediately installed last night. the result was great, indeed the harshness was tamed.
i had a brief time listening to the horns with the newly installed caps but will try to give impressions about them.
i tried comparing them with the tweeters of my epos 14 and found out that the horns somewhat lack extension and have the tendency to present imaging smaller in size. the midrange overshadows a bit the HF. This i believe is caused by the lower effeciency of the horns than the 403a speakers. the discrepancy however is not too bad. 1db or 2db plus on the horns could have made the combi almost perfect.
i've asked dai-ichi if i can return the horns and get another with higher db. they have answered in the affirmative but will have to inspect them if they are still in good condition. i am having second thought though of getting those 10 1/2" by 4" horns. masyado atang malaki!
red76 wrote:Hi Audioboy,
Lovely OB's. Those Dai-Chi's look like diffraction horn tweets. Try to mount one vertically (as opposed to how it's mounted now) and compare how it sounds. Also try to lower the the cap value to 0.47uF oilers if you can find 'em. You can also try removing the L-pad in the network, just to hear if the harshness/grittyness would still be present... Just some suggestions for tweaking. Happy listening.
fred
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