Considering the HF rolloff of my 802Ds, I was wondering what would happen if I made a "Y" adaptor and mounted the 802s on one flange, and a UHF driver of some sort (say, PRV Audio D230TI?) on the other. With a steep crossover dividing the two at, say, 10K, would the result be nice extended range, or garbled nonsense?
GeeDeeEmm
Hi,Originally Posted by gdmoore28
Without offending, I vote for garbled nonsense.
An 802D can have a SUBJECTIVELY beautiful top end, I have heard it !!
The problem is NOT the ALTEC driver, but what drives and preceeds it, in most cases with an 802D, 604, etc. IMHO..
(1) Do you amps play high,.... almost ever SET amp I hear, does not, is a nice midrange device.
(2) Is your wiring wide band??
(3) HOW are the caps in your crossover configured. What are they, and have needed steps been taken by you, to have your crossover capacitors PLAY wide-band, in the tweeter circuit ????
( For example, are they bypassed with smaller films? If so, how, what values, what types??? )
I may be able to suggest a couple of easy-to-implement ideas, to try GDM. Not too expensive either.
Jeff
Last edited by LowOhms; June 16th, 2017 at 01:24 PM.
Y adapters are problematic, use another horn for the HF.
Your neighbors called. They like your music.
I have a couple of JBL 2404 'baby butt cheek' compression driven tweeters in a drawer. After a hearing check I couldn't see much benefit in adding them to the 802/511b. Maybe curiosity will get the better of me.
I did investigate the idea, somewhat, and this is one of the better takes on the subject that I found:
Adding a JBL O77, O75 Tweeter to two way altec system
Also, be mindful that JBL normally used passive crossovers with such tweeters.
Those who have added tweeters to their Altecs report mixed feelings about the result with many preferring to remove them.
This was a popular mod amongst the Klipsch forum guys.
Last edited by mah; June 16th, 2017 at 10:04 PM.
Opinion is only as valid as its verifiable supporting evidence.
(1) Do you amps play high,.... almost ever SET amp I hear, does not, is a nice midrange device.
I assume you mean does it do the hf well? Not that it matters to me as my hf hearing rolls off at about 10K but my McIntosh Lab MC40 monoblocks play pretty flat well over 20K, if I recall they go over 50K before falling off. Yes, I know they are PP and not SE amps but they have a very flat frequency response curve and very low distortion.
Jeff, your a lot older than me, where does your hearing roll off?
BillWojo
Thanks for all the replies, folks!
GeeDeeEmm
You, and mah, from your posts in this thread, do not understand the idea of our high frequency hearing test results, and actually listening to reproduced music.
TRUE STORY, In the 1970s, Mr. Fulton had a woman in her 80s, as part of his listening panel. She didn't hear much above 5K, and Robert told me " she couldn't hear a watch ticking if you put it up to her ear."
One day, Robert pulled the fuses out, left and right, from the top-most tweeter in his " big " speaker, which was flat to 80 KHZ. The top most section rolled in at 32KHZ for a crossover, as I recall.
GUESS WHAT the 80 year old woman said, immediately ??? " What happened to the highs ??? "
Look up the term, RESULTANTs, and study that some !!
One other thing, just because your amp measure on SINE waves to 40K, does NOT mean it will play the speakers up high.
Anything you think your amp may do, tends to get lost in the wiring to the drivers, and gets lost in the unbypassed single caps in your speaker crossover. The system never plays music with correct presence.
Jeff Medwin
Last edited by LowOhms; June 27th, 2017 at 01:37 PM.
In theory, it will work fine, but as noted, combining multiple throats is problematic at best, so for high SQ one ideally has to do it like DSL does with its Unity/Synergy concept multi-way horns.
Better to adjust the horn for best overall tonal blend to the woofer [most of the HF will 'disappear'], then use a bypass cap around the attenuation to let through however much HF is required to tonally balance it out to 15-20 kHz depending on how much mid-band efficiency you're willing to trade.
'Best' is to use a bigger horn to get more tuning flexibility.
'SOTA' is to jack it up 6 ft and slide in a [3] way Synergy concept + separate sub system XO'd at 80 Hz.
GM
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
What old guy said.
And ,
This may very well be the state of the art,
thus far in supertweeters -
MURATA 村田製作所 球形ツィーター ES103A 1... - ヤフオク!
guns kill people,
like spoons made rush limbaugh,
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