Author Topic: Old new speakers  (Read 674 times)

Offline AudioRecycle

Old new speakers
« on: May 27, 2018, 04:36:26 PM »
Hello

I can get my hands on some speakers so I want to give speaker box building a go. I assume it can be quite difficult to get the acoustics right but I am sure there should be software that can help one to design the volume of the box etc. Can anyone suggest such software please.

And do one build boxes from plywood, chipboard. Is it good enough material?

Then also. The speakers that I can get are Coral speakers. They are quite old but still in their original packaging. My guess is late 60's early 70's. It has not being used. The speakers are:
2 x Coral 15L-2 hi-fi woofers such as these. http://www.hifido.co.jp/sold/?KW=&G=0204&LNG=E&O=500&L=50&C=15-00163-57561-00
2 x Coral MHD55
2 x Coral MD60

I wonder if the materials used in the speakers perish over time even if they are not used. The speakers are almost 50 years old. This question for me is the real deal breaker. I would like to here the opinion of other forum members.

My guess is also that these speakers are not all the speakers one would need to build a proper speaker box. Can one mix and match different brands?

Thank you for your advice

Offline King_Julian_S

Re: Old new speakers
« Reply #1 on: May 27, 2018, 05:50:45 PM »
Corals are generally very good drivers .. donít know those models , but they are usually very sensitive as well .. post some pictures
Non audiophile music lover...

Online bbe22

Re: Old new speakers
« Reply #2 on: May 27, 2018, 08:23:30 PM »
I see from ure profile, location, Cape Town. If you decide to get the drivers I can help measuring them for you. U need to do this to get an idea for what they will be suitable
for before starting any project.
In the mean time have a look at this
http://techtalk.parts-express.com/forum/tech-talk-forum/38661-the-speaker-building-bible

Online bbe22

Re: Old new speakers
« Reply #3 on: May 27, 2018, 08:44:01 PM »
mods -  move to DIY audio ?

Offline vinyljan

Re: Old new speakers
« Reply #4 on: May 27, 2018, 09:50:02 PM »
.... I can help measuring them for you. U need to do this to get an idea for what they will be suitable
for before starting any project....

If I were you I'd definitely make use of this offer.  Interesting to see drivers like these unused.  Am I correct in saying that the sound from these in a 3 way speaker might  be different (NOT worse, but still different)  to what we've become accustomed to with modern drivers :thinking:
In a maximum bank turn in a normal category airplane, like a typical Cessna, everything is fine until you turn across your own wake

Offline vinyljan

Re: Old new speakers
« Reply #5 on: May 28, 2018, 07:35:20 AM »
Corals are generally very good drivers .. donít know those models , but they are usually very sensitive as well .. post some pictures

+1, Pics would be nice.  Do you know the history/previous owner :thinking:
In a maximum bank turn in a normal category airplane, like a typical Cessna, everything is fine until you turn across your own wake

Offline PsyCLown

Re: Old new speakers
« Reply #6 on: May 28, 2018, 03:22:14 PM »
I have heard that Alnico magnets can lose their magnetism. I am not sure if this is from use or just happens over time - so might be something for you to look into.

Other than that, physically inspect the speakers, cones and surrounds and such. Chances are they are still fine.

Have bbe22 help you with the driver measurements and then you can look at a design and start with some simulations and then do the crossover and such. Will be interesting to see the end result of this build.
Amps: 4x 150W into 8ohm (LJM L15D)
DSP: MiniDSP NanoAVR HDA & UMIK
Speakers:DIY Full Range Phillips AD12202 & Speakerplan's X15 on loan
Sub: DIY 12" ported & Peerless 10" Sealed on loan
Headphones: Beyerdynamic DT770 LE

Offline AudioRecycle

Re: Old new speakers
« Reply #7 on: May 29, 2018, 03:59:23 PM »
I see from ure profile, location, Cape Town. If you decide to get the drivers I can help measuring them for you. U need to do this to get an idea for what they will be suitable
for before starting any project.
In the mean time have a look at this
http://techtalk.parts-express.com/forum/tech-talk-forum/38661-the-speaker-building-bible
Thank you for the offer to help. I will definitely contact for help as soon as I get the speakers. The build might take a while to start after I have acquired the speakers.


.. post some pictures
+1, Pics would be nice.  Do you know the history/previous owner :thinking:


Hello

Apologies for the delayed reply to all your posts.

No I do not have pictures of the speakers but I have seen them all. To me they look pretty much brand spanking new. Still in their original packaging. The person selling them do not know what price to ask for it. The seller asked me to give him some time to figure out what he will charge me. Didn't want to press for a price because I myself am not sure what I should offer. I am still very new to the Audio game. I don't have any decent audio equipment so when I saw these speakers I thought... ok maybe I should start with the speakers.
:rubhands:

I will get to the person again as soon as I can and get some pictures and hopefully a made up mind on the price. I will also ask the history.

Here are links to the other speakers. They are also in their original packaging.
MD-60
http://www.hifido.co.jp/sold/?KW=&G=0206&LNG=E&O=1200&L=50&C=10-53457-81832-00
http://audio-heritage.jp/CORAL/unit/md-60.html
Page 12 in the catalog http://s000.tinyupload.com/?file_id=80862809879644743725

MHD-55
http://audio-heritage.jp/CORAL/unit/mhd-55.html
Page 14 in the catalog http://s000.tinyupload.com/?file_id=80862809879644743725

Offline AudioRecycle

Re: Old new speakers
« Reply #8 on: May 29, 2018, 04:01:45 PM »
I see from ure profile, location, Cape Town. If you decide to get the drivers I can help measuring them for you. U need to do this to get an idea for what they will be suitable
for before starting any project.
In the mean time have a look at this
http://techtalk.parts-express.com/forum/tech-talk-forum/38661-the-speaker-building-bible

Thank you for the link.

Offline King_Julian_S

Re: Old new speakers
« Reply #9 on: May 29, 2018, 07:12:59 PM »
Btw your original guess is not right .

These are all the drivers required for a very good 3way... mid and tweet + woofer

If you donít buy them let us know ...
Non audiophile music lover...

Offline marantz123

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Re: Old new speakers
« Reply #10 on: May 29, 2018, 11:30:12 PM »
Those are 15" Coral woofers ?..wow. 38mm coils. Have the "10L" which are 10" in the BX300s.Yours looks like a cast frame (aluminium?) and what looks like a shielded magnet?....looks like a higher quality component.
The 10L has the same cone material from the looks of it,  but the surrounds are different type..a concave molded material that also seems to last forever. A question is..what would one expect of them, taking into account that they were designed for "music of a different time" and what content ( modern compressed stuff, Rock, Classic, Jazz etc.) do you need to reproduce?  My experience with the 10L in both the Acousta Sonics AS250 and the Coral BX300 is that they do very well with classic, jazz and lower vocal tones, but not that great with Rock, Pop, and the newer compressed formats and cannot handle extended  excursions...seemingly designed for sealed enclosures as both these speaker sets are.  I also noticed richer bass tones ( not lower) on the 10L...this paper has its own signature...theres information somewhere about the paper material /composition that Coral used. You can find information about Coral drivers on Japanese websites, and may even find build recommendations for these drivers. Looks promising if you do decide to go for these and could sound very pleasing. :thumbs:

Online bbe22

Re: Old new speakers
« Reply #11 on: May 30, 2018, 09:05:29 AM »
https://medias.audiofanzine.com/files/coral-komplett-1-479906.pdf

very important doc for OP

on PP8  Coral advise  the bass is to be used in a huge sealed cab  ........................now you know :)

Offline PsyCLown

Re: Old new speakers
« Reply #12 on: May 30, 2018, 11:42:23 AM »
https://medias.audiofanzine.com/files/coral-komplett-1-479906.pdf

very important doc for OP

on PP8  Coral advise  the bass is to be used in a huge sealed cab  ........................now you know :)

Not sure how old that is, however why did the market take a turn and stop offering back loaded horns and full rangers as more common commercial products?

Why are we stuck with mostly ported or sealed enclosures now a days from a commercial aspect? :/
Amps: 4x 150W into 8ohm (LJM L15D)
DSP: MiniDSP NanoAVR HDA & UMIK
Speakers:DIY Full Range Phillips AD12202 & Speakerplan's X15 on loan
Sub: DIY 12" ported & Peerless 10" Sealed on loan
Headphones: Beyerdynamic DT770 LE

Offline El Sid

Re: Old new speakers
« Reply #13 on: May 30, 2018, 11:55:54 AM »
Not sure how old that is, however why did the market take a turn and stop offering back loaded horns and full rangers as more common commercial products?

Why are we stuck with mostly ported or sealed enclosures now a days from a commercial aspect? :/

Size maybe? The BLH speakers I'm planning with (with 8" Philips fullrange) will be much heftier (and less powerful) than my KEF bass reflex with 8" woofer.

Some cynics here will tell you that it's because they sound cr@p...

Offline AudioRecycle

Re: Old new speakers
« Reply #14 on: May 31, 2018, 10:12:46 PM »
Btw your original guess is not right .

These are all the drivers required for a very good 3way... mid and tweet + woofer

If you donít buy them let us know ...

I will do so