Lowering the crossover point.

GM · August 24th, 2012, 08:08 PM

Originally Posted by cradeldorf

I'm enjoying the Jethro Tull coming out of them right now. Doing the FM radio thing.

For some reason I can picture you sitting here going "Damn this bastard don't have a Tin ear, He's got an Iron ear!!!" LOL Okay I'll put the bong down now.

No, not really, but I too wonder what the whole story is as the bits n' pieces I've read don't make a lot of sense to me...........

GM

**VolvoHeretic** · August 25th, 2012, 07:24 AM

I've lost track, what cabinets are your drivers residing in now? Got any pictures?

**juniper** · August 25th, 2012, 07:31 AM

Originally Posted by GM

Hmm, I'm logged in and stay logged in even when the forum disappears/reappears unless it's a major update. Anyway, I was looking for a plot, but I now see it's a picture of the sliders. Interesting EQ, mostly the opposite of what a 604 would need.

GM

I agree with this, if I eq my 604's like this, the midrange energy overwhelms the lows and some of the highs. Something seems off......

GM · August 25th, 2012, 11:03 AM

Ya think?!

GM

**VolvoHeretic** · August 25th, 2012, 11:26 AM

I've got the free WinISD Pro which has an Altec 515-8HHP installed and although I don't know how to use this program and no matter what box or vent size I pick (trial and error), that driver does not plot as well as my 418-8hII. With both the 418 in an 8 cu ft box and 11X3 sq in vent or 416-8A in an A7-500, I have the EQ boosted at the very bottom and top only and both sound great (music content only, no video).??

GM · August 25th, 2012, 11:29 AM

?? Sorry, I miss your point.

GM

**VolvoHeretic** · August 25th, 2012, 11:41 AM

LOL. Sorry for the ramble, I didn't know anything about the 515's and thus the 604's and after playing around, I was concurring with the above statements that the 515 and all Altecs for that matter need EQ at the top and bottom of the frequency spectrum.

GM · August 25th, 2012, 03:57 PM

Not sure I agree with 'all' unless limited to the systems designed for a high output impedance since speakers with 411s, etc. designed for SS amps generally don't need any bass boost in a typical HIFI/HT app. WRT the HF, if CD horn EQ is used, the highs generally don't need boosting either.

GM

**VolvoHeretic** · August 25th, 2012, 10:14 PM

OK, I retract everything I wrote. My only experience with Altec has been the A7's, 418/32B thingy?s, and a quad of 421/511B powered PA thingy?s, but it has been a 35 year long and lovely journey.