• The move to the new server is done. There are some software and database maintenance updates in process. This has us passing the hat around to help out. We appreciate any donations. Seriously, even a dollar helps. The payment page may be found here - https://www.audiokarma.org/support.html

Nobody doesn't like Dynaco A-25's.

gonzomeep said:
Hi Rich, thank you. I would like to know if what I wrote wrt my experiences if offensive? Can you take a look at what I wrote? Thank you.
Click to expand...

I took a look at what you and your buddy wrote and it had absolutely nothing to do with the topic at hand. It was personal and has no business in the open forums. I've edited and deleted several posts in an effort to try and get this thread back on track. Shame a few of you chose to ignore my warning to knock it off.
 
Editing

Celt said:
I took a look at what you and your buddy wrote and it had absolutely nothing to do with the topic at hand. It was personal and has no business in the open forums. I've edited and deleted several posts in an effort to try and get this thread back on track. Shame a few of you chose to ignore my warning to knock it off.
Click to expand...


Thank you Celt.
 
I like the A-25s as well.

Since we're getting all geeky and whatnot.

I'm guessing the A-25 was not designed around the newer method of computer designed box/crossover whatnot based on it's year of inception.

So...can someone with that knowledge/expertise...

Spec the A-25 with the newer method and let us know how close or how far off they were with it? Just like when people mention recapping them, my A-25s sound great, I still haven't gotten the urge to change what works.
I also read a post or two stating they sounded worse after recapping...

It would be neat to do this to other speakers as well, even if they were originally designed this way according to the manufacturer, more real world results...

Yes/no?
 
Tom Brennan said:
A long time ago I bought a pair of A-25XLs at Musicraft. I liked the sound but I popped the tweeters trying to get loud (the amp was a Dyna 400). So I bought a second pair of the speakers and stacked them.

Regardless of what might have happened to the frequency response two pairs gave me lower distortion and increased dynamics, those are good things IMO. I was much happier using two pairs than using one.
Click to expand...
I'm curious about how you had them configured Tom. Stacked on top of each other? Tweeter to tweeter?
 
I like my A-25s. They play in my shop all day long, 5 days a week with a little ol' 2238B. Works for me.

I've also used them with a Sony sub at home, nice imaging is possible if you work at it a bit.
 
I have two pairs of A-25's(both pair have the Vent
on the bottom)and both pairs were from the same
GW at different visits.I have stacked them in all the
variations,as with my pairs of advents,and I always
put them back to a single pair.
But it is soo much fun moving things around and
playing with my toys.
I have never heard the A-25's on a TUBE set up
and Imagine it must be heavenly!
Mark.
 
Tube + A25's

As I wrote earlier, my best friend gave a pair of A-25's to his mother for Mother's Day. They are powered by a sweet old Magnavox EL84 valve amp taken from a console. Definately something to try.
 
Teron said:
So...can someone with that knowledge/expertise... Spec the A-25 with the newer method and let us know how close or how far off they were with it?
Click to expand...
Well, yes, and it would probably indicate some ways to improve the design, but it wouldn't perfectly reflect the quality of the original without having new drivers. The new methods are based upon measurement of driver parameters, and while it's possible to measure the old ones, they are, well, "aged" and used, after all.

It's very likely that better speakers could be made of the same design (box size, aperiodic vent, etc.) using modern drivers and design methods. We wouldn't be getting those for $10 at the thrift store, tho. In this regard, it'd be a worthwhile project to update a pair using new equivalents....

Tom Brennan said:
Regardless of what might have happened to the frequency response two pairs gave me lower distortion and increased dynamics, those are good things IMO. I was much happier using two pairs than using one.
Click to expand...
Yes, you get as much as 3 dB more SPL at the same distortion levels. That's one well-known advantage of running multiples, but it's traded off against the known deleterious effects of doing that, as well.

Jack's measurements showed what I highlighted as a major benefit of stacking A-25s - mutual coupling of the woofers adds an additional 3 dB in the bass, the sum being better balanced, at least when measured freefield. There are preferable methods of compensating for that deficiency, if there actually is one, such as suggested by cabinover, above, for example....
 
Zilch said:
It's very likely that better speakers could be made of the same design (box size, aperiodic vent, etc.) using modern drivers and design methods. We wouldn't be getting those for $10 at the thrift store, tho. In this regard, it'd be a worthwhile project to update a pair using new equivalents....
Click to expand...


Hey, Zilch

Do I sense another project coming on? I double dog dare you!!

Jaxck Gifford :banana:
 
jackgiff said:
Hey, Zilch Do I sense another project coming on? I double dog dare you!! :banana:
Click to expand...
Heh, heh.

You and me gotta finish our LE14 projects first, Jack. You may not have noticed, but I measured FOUR of those BMS HF drivers on PT-F95HF waveguides @ #19, above.... :p:
 
I have the a50's and the a25's. I love the sound of the a50's. Lots of bass that though they sound good, the a25 can't match.
 
Where did you get that RTA and how much do they cost? I would love to get one if they arent too $$

Great analysis, Zilch
Thanks for taking those readings, Jack!
 
xoaphexox said:
Where did you get that RTA and how much do they cost? I would love to get one if they arent too $$

Great analysis, Zilch
Thanks for taking those readings, Jack!
Click to expand...


xoaphexox, mine was purchased on E-Bay. IIRC, the price was about $250 for the RTA and $50 for the Microphone. Add a few dollars for cables and a mic stand, and you are in business. Zilch will probably recommend a Guitar Store, and quotes prices like around $300, so we are very close, but I don't have a local guitar store.

Having an RTA to measure speaker response takes most of the guess work out of the picture, and provides a lot of fun. I really enjoy mine, and wouldn't want to try to build a pair of speakers without it.
 
You must log in or register to reply here.
Back
Top Bottom