Results 1 to 10 of 245

Thread: My A7-500s. A journey

Hybrid View

Previous Post Previous Post   Next Post Next Post
  1. #1
    Senior Hostboard Member gearfreak's Avatar
    Join Date
    August 20th, 2008
    Location
    SEPA
    Posts
    633
    Follows
    0
    Following
    0
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: My A7-500s. A journey

    Quote Originally Posted by Panomaniac View Post
    Yes, you've got it right. I'm trying to find a tweeter that will reach down lower, but still keep up with the 288/1005.
    I've a similar arrangement, though 515-8G's.
    Experimenting with some EV XEQ-808's at the moment and the 288 are heavily padded with it.

    RE tweeters: Some I've tried listed below, if looking for additions to a short list.
    Experimenting with the HF has been low priority for me, so experience and thus comments are minimal. No measurements on my end to be had atm.

    Aurum Cantus G1 (spec'd: 103db, $$$, too directional :-( )
    GPA 902-16A:
    Beyma CP09: PW Buyout iirc. Cheap at the time. 104db spec'd
    Selenium ST-324
    multiple piezo's in an array...

    ummm.... I think that's it.

  2. #2
    Senior Hostboard Member VolvoHeretic's Avatar
    Join Date
    May 8th, 2011
    Location
    The Exact Center of North America
    Posts
    841
    Follows
    0
    Following
    0
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: My A7-500s. A journey

    Quote Originally Posted by gearfreak View Post
    multiple piezo's in an array...
    How did the piezo's sound? I have 8- 3" super tweeters artfully ducktaped onto each of my 511b's and think they sound fine, but I don't really know, I’m a low brow stereo aficionado. I wired them up wrong however thinking that I had to worry about too low of an ohm load on the amp, so I have them wired up in parallel and in series which I now realize I didn't have to and should have just wired all of them in parallel.
    Last edited by VolvoHeretic; August 31st, 2011 at 03:04 PM.

  3. #3
    Senior Hostboard Member gearfreak's Avatar
    Join Date
    August 20th, 2008
    Location
    SEPA
    Posts
    633
    Follows
    0
    Following
    0
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: My A7-500s. A journey

    Quote Originally Posted by VolvoHeretic View Post
    How did the piezo's sound? ...
    Wow, 8!
    The piezos I have are an array of 4, mounted in a little nacelle off of some Dukane's.
    The nacelle will fit behind the grille cloth/in the port if I want it to (stacked 828's).

    Probably better than one might think, but I know I didn't have the XO point for the piezo's sorted. There was more overlap than called for.
    I then became sidetracked a/b'ing the vintage piezos with modern ones.
    Then I got some more horns.
    Then... ...well, we all know how this goes. :-)

    I'll return to playing with the tweeters after I've figured out more of what I've concocted w/these XEQ-808's + padding.
    I am sure the whole shootin' match could be streamlined a bit.

  4. #4
    Senior Hostboard Member Panomaniac's Avatar
    Join Date
    May 25th, 2006
    Posts
    1,811
    Follows
    0
    Following
    0
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: My A7-500s. A journey

    Analog Addict (Alan) has an array of little horns on top of his multicells. They may be Foster or similar. It works really well.

    Gearfreak: Thanks for the tweeter list. I actually have a pair of those little Beyma buyouts. They're pretty useless. But they were cheap!

    My main trouble with the 288 is a deep notch at 8444Hz. 2nd Harmonic distortion peaks wildly there, too. If it weren't for that, I'd be super happy. Wavelength of 8444Hz? 4cm. Depth from driver flange to tangerine plug? 8cm. Hmmmm...... Could it be the bug screen? I took it out (and put in a rubber washer that was missing) and thought that would do it. No such luck. ;( In fact it's worse, if anything. Like the bug screen might have dampened the resonance. A 290 driver on the same horn does not have the notch, tho it's hard to tell because it's so far down at 8.4K. An old Radian driver has some of the notch and distortion, but not as much or as sharp. It also does not have the top end of the 288. Sure wish I could figure out what it is and kill it.

  5. #5
    Senior Hostboard Member gearfreak's Avatar
    Join Date
    August 20th, 2008
    Location
    SEPA
    Posts
    633
    Follows
    0
    Following
    0
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: My A7-500s. A journey

    Quote Originally Posted by Panomaniac View Post
    ... My main trouble with the 288 is a deep notch at 8444Hz. 2nd Harmonic distortion peaks wildly there, too. ... Sure wish I could figure out what it is and kill it.
    So it's not the tweeter overlap, seen in the prev. FR graphs?

    Maybe try a different horn? (assuming, same peak with both 288's of course).

  6. #6
    Senior Hostboard Member Panomaniac's Avatar
    Join Date
    May 25th, 2006
    Posts
    1,811
    Follows
    0
    Following
    0
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: My A7-500s. A journey

    It's a deep notch, maybe 20dB. I think it's the driver since 2 other drivers on the same horn don't have the notch, or not as bad. Both 288s do. I have someone helping me make it go away. Will try a different horn if I can.
    The notch is narrow, about 1/7th octave, but I don't like it. I've tried to blend the tweeters over it, but no real luck. Too bad because with the proper HP shelf on the 288 + 1005 it can be flat to 15KHz. No need for a tweeter.

  7. #7
    Senior Hostboard Member Steve Mac's Avatar
    Join Date
    January 5th, 2006
    Posts
    732
    Follows
    0
    Following
    0
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    18 Post(s)

    Re: My A7-500s. A journey

    Quote Originally Posted by Panomaniac View Post
    No need for a tweeter.
    I've got a ribbon tweeter at 10kHz with a 511e+288h.
    The high end no longer "beams". So much more enjoyable and sounds effortless. JMHO...

  8. #8
    Senior Hostboard Member VolvoHeretic's Avatar
    Join Date
    May 8th, 2011
    Location
    The Exact Center of North America
    Posts
    841
    Follows
    0
    Following
    0
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: My A7-500s. A journey

    Quote Originally Posted by gearfreak View Post
    I then became sidetracked a/b'ing the vintage piezos with modern ones.
    How did the a/b'ing sound? My piezos were bought from Radio Shack in the '70s and didn't have a manufacturer or wiring instructions and according to this thread, should only be Motorola's.

    However, I use a heavy does of EQ and boost the highs and lows extremely and had the upper horns padded down to about 75%.

    Using piezo tweeters wisely: a "how to" - AudioKarma.org Home Audio Stereo Discussion Forums
    Last edited by VolvoHeretic; September 1st, 2011 at 03:25 AM.

  9. #9
    Senior Hostboard Member gearfreak's Avatar
    Join Date
    August 20th, 2008
    Location
    SEPA
    Posts
    633
    Follows
    0
    Following
    0
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: My A7-500s. A journey

    Quote Originally Posted by VolvoHeretic View Post
    How did the a/b'ing sound?
    eh, I didn't get quite so far as to develop and opinion before becoming side-tracked.
    The newer ones either had better sensitivity/output (if that would be the correct term), or went higher in a noticeable register.
    Maybe that makes the vintage ones 'smoother' or maybe it makes them 'broken' ;-).

    Quote Originally Posted by Panomaniac View Post
    Analog Addict (Alan) has an array of little horns on top of his multicells. They may be Foster or similar. It works really well.
    Gearfreak: Thanks for the tweeter list. I actually have a pair of those little Beyma buyouts. They're pretty useless. But they were cheap!
    You are welcome for the additions to your list. That's funny about the CP09's. Maybe if I look at mine and they are less than ideal, we can send them along to VH to play with. ;-)

    I've liked the fostex (via Zenith Allegro 3000's iirc), and in fact that may have been used as well in some TOA PA cabs (MIJ) - which I also liked.
    So they might be a sleeper for this application, if avail in quantity as such. I have no other particular experience with them though.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
This forum has been viewed: 23808158 times.