GoodSoundClub - Romy the Cat's Audio Site

In the Forum: Horn-Loaded Speakers
In the Thread: A right midbass solution for Altec 515G.

Post Subject: Ringin!Posted by Jorge on: 4/11/2012

Hello Macman,

Nice horns, I like that you finished everything properly! I am getting tired of seeing piles of horns.

I think the ringing you are getting from your midbass horn is that the throat reactance is not balanced. How did you calculate the back chamber of the Altec woofer? Can you make some adjustments? Usually the "ringing" can vary in freq. depending on the size of the back chamber. Make it smaller or bigger and check how the ringing goes, get used to the ringing and learn to identify it, you will need to find it to get rid of it! If you think a 120 hz horn ringing is a problem, wait untill you try a 140 or 180 hz horn!!! Now that is a mess at very listenable frequencies!
When Romy said: live with your midbass (upperbass) horn for a while, I guess this is what he meant.

"to me it sounded really good" Then why in hell did you go through all the trouble of making a midbass horn with it? And let me tell your work is not over yet, you are only half way, when you get rid of the ringing (jajaja), then you are finished... And let me tell you wont stand the Valencia after that!

Funny choice of drivers, xovering will be a mess with all the different sensitivities, the JBL must be 108-110 db, the Aurum Cantus 102 db, have you measured what sensitivity you are getting from your upperbass? Altec 416s I think are around 100 db so you should get 106-108 db if your horn is working properly: The problem is that you will have to get an amp just for the tweeter (reccomended) or pad your nice horns down to 102 db (not reccomened)...

Play around with the upperbass horn, then add the JBL and finally tweeter and tapped horn.

I played around with tapped horns a lot, you must highpass yours at 25-30 hz or it wil become blurry, plus you have to low pass at 120 hz high order, or even lower to match your upperbass horn; 100- 95 hz maybe, this will help a lot on transparency. The cabinet resonates a lot on TH. Also if you are running it with a subamp, that wont help, most of them are terrible... you might get a nicer one or already got it!

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