12 replies to this topic

[dynaco_dan]

Hi Craig;

The comparison hasn't happened yet.

My home was terribly disrupted by a leaking roof and I haven't recovered yet.

[dynaco_dan]

Hi there;

The Dynaco A-25 speaker came out sometime in 1969.

We have seen the Scan, first issue, and Seas, later issue, speaker drivers.

I was just looking at the, Dynaco A-10 April 1972 Stereo Review magazine photo.

At this much later date, I see they used a 4 screw, possibly a Scan woofer.

The tweeter is the Seas, 8 screw version.

Considering that Seas was the primary developer of the Dynaco A-25, I wonder where and how Scan fits into the timetable.

The reviewer claimed that the averaged frequency response was, +/-4 db from 50 Hz - 15 Khz, maximum low-frequency output was at 80 Hz and a broad high frequency maximium at 10 Khz.

Distortion was @ 1 watt level, was below 5% down to 65 Hz, reaching 10% at 50 Hz.

They felt that 50 - 60 Hz was the lower practical limit, not bad for a 6" woofer, in their opinion.

There was an extreme loss of highs above 10 Khz.

Tone burst response test's were taken at 100 Hz, 1 Khz and 10 Khz, very clean and sharp.

Strange that two other magazines found a peak at 9 - 10 Khz and there was no comment about this tweeter having that.

Overall the speaker was smooth and the bass, impressive, they gave a B+ in the listening test.

The highs output and dispersion were better than average.

Pipe organ and bass drum's were not carried off, as in a larger system and the highs were noticeably in less obvious abundance than units using multi-unit dome tweeter arrays.

[dynaco_dan]

Hi Craig;

The comparison hasn't happened yet.

My home was terribly disrupted by a leaking roof and I haven't recovered yet.

Hi there

Better late than never LOL

Because of severe hearing loss I would not be a good juge of sound to do a comment even, sorry.

[dynaco_dan]

Hi there

Better late than never LOL

Because of severe hearing loss I would not be a good juge of sound to do a comment even, sorry.

Hi again

I will do an A -B sound test even though my hearing is off a little.

Vern

[DesignInc]

I could not figure out from your posts if you have the Dynaco A-10 or just interested. I have a very nice pr of A-25 I use for the TV room thinking I'd like to get an A-10 for a center channel to voice match my current right and left. How do the A-10's sound? I have been searching for a set or single, but haven't found one yet.

I have a pdf of the 1975 catalog that says they voiced it as close to the A-25 as possible used the same tweeter same aperiodic enclosure.

David

[dynaco_dan]

I could not figure out from your posts if you have the Dynaco A-10 or just interested. I have a very nice pr of A-25 I use for the TV room thinking I'd like to get an A-10 for a center channel to voice match my current right and left. How do the A-10's sound? I have been searching for a set or single, but haven't found one yet.

I have a pdf of the 1975 catalog that says they voiced it as close to the A-25 as possible used the same tweeter same aperiodic enclosure.

David

Hi David

When I first wrote here on this site about my, classic Dynaco A-10, all I owned then was a single

speaker, less the woofer.

It had been given to me free from a past customer of mine.

It has a vinyl covered cabinet with a dark brown grille cloth.

Time passed by and I got the ebuy bug, badly.

I was rescuing everything I could and finally bought a mint pair of complete A-10's in an

oiled walnut cabinet, with the original beige linen grille cloth's, from a fellow Canadian seller.

They look like they just came out of the factory, they were very well looked after and also well

packaged for shipping to me.

Being as he was a Canadian seller, there was really no bidding competition for me, it seems like bidders stay away

from Canada, probably thinking that our customs is such a hassle to deal with.

It is.

The tweeter used is the 1 1/2 inch Seas model, was the same 8 ohm unit also used in the classic A-25, A-35 and A-50 speakers.

The later XL 1 inch tweeters were slightly more efficient and so they are a little louder sounding when compared.

The A-50 used 2 - 15 ohm woofers, paralleling them is an 8 ohm load, all other classic speakers used, were 8 ohm woofers.

There may have been a Scan tweeter used in early production A-10 units, I do not know that for a fact.

The A-25 and A-50 used some Scan tweeters and woofers in early production units, amount unknown.

The speaker model number, the first two numbers on the rear label, did not change, whether using the Seas or Scan model drivers.

The A-10 woofer uses the same magnet assembly as the 1 1/2 inch tweeter, as did most, but not all of the 10 inch woofers.

I will be taking pictures of these and starting another topic in the near future with photos galore, showing these differences.

The A-10 cabinet was also vented externally, Aperiodic, similar to the A-25.

There is no level control or banana plug connections, just screw terminals.

All Dynaco classic speakers were all approximately of the same sound quality, except mostly in the lower, under 100 hz range.

The fuse for it, as well as some of the others, was 1 amp fast blow and for the A-50 a 1 1/2 amp fast blow fuse, slow blow fuses were never mentioned.

There hasn't been any information, that I am aware of, regarding using a Bussmann or Littlefuse FNM/FLM slow blow fuse, as Advent and AR had recommended

for their speaker owners, also there was no fast blow fuses even mentioned by them.

Smooth impedance curves means that any of these 4 models could be used without as much concern about adding

difficult amplifier loading, as with typical speakers.

The A-10 had the least bass output of the 4 clasic speakers, the tweeter across the board, was by far the stronger of the two drivers.

You may be interested in using a Dynaco Quadaptor and a pair of A-10's.

Another pair of A-25's will likely cost you less and offer you more satisfying sound.

Do a search here for, "Dynamax", a wiring diagram for various multi Dynaco speakers.

At this time it is actually just 2 topics below this one, it was originally started by, "dynacophil".

Just a thought for tonight.

[GP49]

I just "rescued" a pair of walnut Dynaco A-10 from the dormant system of my late father. Other than fading of the walnut finish where
one loudspeaker has been sitting in sunlight for 30+ years (now cured by rubbing in brown shoe polish and buffing!), they're
like they came from the factory. Dynaco and its Danish partners who made those speakers (and the classic A-25s, too) are to be
commended for making something of such high performance and longevity.

The A-10s are about the same size as my main speakers, a pair of Red Rose Rosebuds, a Mark Levinson import with ribbon tweeters.
It will be interesting to compare the two, both with the subwoofers I usually operate with the Rosebuds, and without.  Amplification is
all tube, modified/upgraded Dynaco preamp and monoblock power amps.

[dynaco_dan]

I just "rescued" a pair of walnut Dynaco A-10 from the dormant system of my late father. Other than fading of the walnut finish where
one loudspeaker has been sitting in sunlight for 30+ years (now cured by rubbing in brown shoe polish and buffing!), they're
like they came from the factory. Dynaco and its Danish partners who made those speakers (and the classic A-25s, too) are to be
commended for making something of such high performance and longevity.

The A-10s are about the same size as my main speakers, a pair of Red Rose Rosebuds, a Mark Levinson import with ribbon tweeters.
It will be interesting to compare the two, both with the subwoofers I usually operate with the Rosebuds, and without. Amplification is
all tube, modified/upgraded Dynaco preamp and monoblock power amps.

Hi there

Sorry for the loss of your father.

He had great speaker taste and it was fortunate that you inherited the A-10's.

I am certain that he would be very happy knowing that they will be well looked after by you.

Longevity and durability was a highlight of all Dynaco products.

Only a few classic pieces were ever dropped from their product line, after stereo became the norm and tube equipment sales declined,

otherwise Dynaco sold upgrade kits for most all of their solid state and tube electronic products.

An exceptional consumer oriented company, not to be seen again.

Thank you for mentioning the shoe polish coverup, it gives us another option.

[dynaco_dan]

Hi there

An exceptional consumer oriented company, not to be seen again.

Thank you for mentioning the shoe polish coverup, it gives us another option.

If I just edited my previous write-up, it would not be picked up by anyone.

The Seas tweeter, as I have written plenty about previously, was the stronger of the two drivers, at least in the A-25 speaker system, about

100 - 1, woofer versus tweeter replacement.

I only ever serviced one A-50 speaker system, I still remember writing down all of the cabinet measurements.

The A-50 required a new tweeter and it would appear to be the weaker link in this dual woofer system.

We will never know which woofer brand, Seas or Scan, ot tweeter brand, Seas or Scan, was ever used in any of the classic Dynaco speaker systems.

It would bug me to find that I had a Scan speaker version in one channel and a Seas speaker version in the other.

I would have said to myself, they must be different.

I guess the tweeter dispersion comments in different old reviews reflected the reviewers opinion and the reflection from the baffle and cabinet edges.

We will never likely find out the full story of Dynaco and how, why and when, the A-25 speaker system.

Why they did not change prefixes when changing the drivers, cabinet layout, mirror images and crossovers mid stream, is anyones guess.

Last visit to ebuy I saw A-10's selling for much more than A-25's.

My guess is that compared only to the A-25's Dynaco sales, their other model sales would be slimmer.

We do not have any hard data about that.

Over a million sold of the A-25's, that is all I've ever read.

Not bad considering that the discounted packaged pair of A-10's were selling new for just over one A-25's list price.

An electrical schematic of the A-10 would be nice along with some crossover photos.

If I wanted center fill, or rear add-on speakers, I would buy A-25's at a generally lower priced, better sounding system, unless space is

also a serious consideration.

[Horswispr]

I wrote this review of the A-10s a few years ago (for Epinions, a site not exclusively for audio nuts) and I still think it's accurate. A-25s usually go for somewhat more than A-10s on eBay (I always watch Dynaco speakers), but really minty A-10s can go for around $200/pr. I've had about 10 pairs of A-10s pass through here and all had the same complement of SEAS drivers. Don't know if there were ever any Scanspeak A-10s.

http://www99.epinion...nt_278745878148

[dynaco_dan]

I wrote this review of the A-10s a few years ago (for Epinions, a site not exclusively for audio nuts) and I still think it's accurate. A-25s usually go for somewhat more than A-10s on eBay (I always watch Dynaco speakers), but really minty A-10s can go for around $200/pr. I've had about 10 pairs of A-10s pass through here and all had the same complement of SEAS drivers. Don't know if there were ever any Scanspeak A-10s.

http://www99.epinions.com/content_278745878148

Hi there

I thank you for correcting my Scan driver comment.

A few moments ago I re-visited a scanned SR review that I have and on closer inspection, I

see that I was aware of the 4 screws, and missed the other 4 screw holes.

I know that the Scan have 3 screws.

My scan is inferior to Wally's original copy, which I have already returned to him.

It took a blowup of my best scan to see where I went wrong.

I guess I was tired and didn't pay close enough attention to details on my scanned copy.

I was quick to draw a conclusion because of the many photos I have seen of A-25 and A-50 Scan and Seas versions, sorry.

Thank you very much again.

I've enjoyed a number of speaker write-ups you've done at that site, very well done.

[dynaco_dan]

Hi there

Last week there was a pair of nice looking A-10's on auction.

I only saw it once and the price was around $60.00 for a pair located here in Vancouver BC.

A location was requested by a bidder also here in Vancouver.

I missed the finally as to the final price but one living so close would be able to bid higher.

A few years ago I won a pair for under $100.00 in Ontario.

No one seems to bid if in Canada, what a shame.