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Old 6th May 2014, 12:36 PM   #311
Rewind is offline Rewind  Sweden
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Be careful what you use to coat it. I used wood oil for one horn and it made the glue release. It was a mess.
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Old 7th May 2014, 11:41 AM   #312
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Originally Posted by Rewind View Post
Be careful what you use to coat it. I used wood oil for one horn and it made the glue release. It was a mess.
that much have been rather heart breaking. I suppose re-bond and sand and they were OK again?

I will choose spray filler to enable me to sand to a really smooth finish and then spray paint - like I did for the birch ply protos only even better
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Old 28th July 2014, 08:00 PM   #313
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Any news on your system?
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Old 29th July 2014, 09:58 AM   #314
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Not much.
I am firmly on the JBL2220 on short mid bass horns (as were). Sound fine.

Oh, I have ordered a WaveIO USB->I2S converter - the PCB is being made now and will be ready in a couple of weeks. This will go inside the Najda DAC-DSP-X/O box and take it's 5V supply from there. Keeping all connections short.
I will be able to stream 24/96 -192 files then. It is actually capable of 24/384, do such files exist?
I borrowed a 24/192 M2Tech USB->Coax converter and the difference with certain hi-res files was noticeable. That is not to say that 16/44 does not sound fine, just that hi-res files above 16/44 sound not so good when played on my current converter! The down sampling done is impacting the SQ.
So lets see what I2S brings to the party!

How about you - new stuff?
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Any news on your system?
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Old 25th January 2015, 01:55 AM   #315
Rewind is offline Rewind  Sweden
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I have had made your midbass horns and used JBL 2220H and I perfer now the Meyer 12" in a vented cabinet. 15" driiivers has no business above 150 Hz IMHO. Saves space too! 15" drivers were just a Hornresp dream.
https://scontent-a-fra.xx.fbcdn.net/...98&oe=556BB604

Last edited by Rewind; 25th January 2015 at 02:00 AM.
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Old 31st January 2015, 03:40 PM   #316
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Default Onwards and upwards!

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Originally Posted by Rewind View Post
I have had made your midbass horns and used JBL 2220H and I perfer now the Meyer 12" in a vented cabinet. 15" driiivers has no business above 150 Hz IMHO. Saves space too! 15" drivers were just a Hornresp dream.
https://scontent-a-fra.xx.fbcdn.net/...98&oe=556BB604
That's interesting Rewind
I'm gonna have to try 12" then, in an exponential / hyberbolic.

Agree that hornresp only tells you what the SPL / Hz might be and driver excursions etc. Not much about the actual sound quality.

I've played around and a nice throat adapter added to my existing horns to go from the larger throat to what I need for the 12" drivers and add the needed length too, is easily doable.
The mouth will be a little bit smaller than optimal, but not by much.
If I like the SQ then a couple of extra big rings would see the mouth sorted too!

So a couple of hours turning a pair of throat adapters and get me some nice 12" drivers and I'll be able to comment

Anything special about the Meyer 12"?

Luckily I ordered more birch ply for another project and so have plenty of offcuts to do this project...
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Old 1st February 2015, 11:56 AM   #317
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Yesterday we visited a hifi shop that sells surprisingly many 50000 euro speakers. We listened to the Tannoy Canterbury SE with Tannoy's famous 15" coaxial driver.
Tannoy Canterbury SE Photo by ozzi-photo | Photobucket
http://i0.wp.com/jeffsplace.me/wordp...size=695%2C438

The idea of using a 15" in the midrange has been explored for decades by Tannoy. If anyone has the potential to make a great 15" midrange driver is Tannoy.
The seller told me the driver is the same as in their more complex horn speaker: http://4.bp.blogspot.com/-SoPo2yR5KE...al%2B3blog.jpg

It sounded better than the JBL 2220 15" in a horn, but it was struggling in the mids and had rather limited bass, so the Tannoy driver is really made for midbass and mids, not bass, yet it fails at this and sound pretty gnarly. I now feel confident to dismiss the idea of using 15" drivers highpassed around 400Hz. They will not reach the sound quality of a 12" midbass, especially if you combine this with something like a Saba Greencone 8" for mids. http://members.aon.at/peter-hifi/fer...ilder/Saba.jpg

The Saba can have its bad days too. If the Saba Greencone sometimes overly excited sound can remind me of a bee-hive, the Tannoy 15" was more like an exhaust pipe of a Husqvarna motocross.

Going for even smaller midbass drivers, like with the Linn Exakt 350 which uses 6.5" for upper bass and two 8" drivers sub, that I heard the other day, is missing the relaxed feeling of the Meyer 12". Those 6.5" and 8" drivers need to work hard to produce the same sound a 12" midbass would do in its sleep, with its pinky.

Back to the Tannoy Canterbury SE. Treble was smooth. Seller said he preferred it over the other expensive JBL speakers he had. I understand why since JBL insist on using titanium diaphragms even for hifi speakers. And their woofers are made for bass but not much more. He said JBL has a good party factor, but lack in finesse.

My girlfriend confirmed that we have better sound at home (Beyma TPL-150, Saba Greencone 8", and with the Meyer 12" in a ported box filling up the midbass in a discrete way. You don't really notice the Meyer 12" but you notice it when it is gone. No face-slapping snappy kick drum, like the JBL 2220H in a horn - more of a mellow "burrr". I am sure Meyer used a coating or some other design feature that works as a highpass filter. I only need a 1st order highpass and I get almost no nasty treble.
I tried the Meyer 12" in the same horn as the JBL 2220 with the 12 liter sealed bak chamber, and it did not work so good. It i possible I need a larger back chamber. And a smaller throat. And a longer horn. I.e. a new 60kg horn. :S

I don't think there is anything special with the Meyer 12". You should be able to find similar drivers, unless you have to have certain model for historical reasons.

Yesterday I reconed a JBL E-120, a popular guitar driver and recently popular for PA and hifi. Beyma even made a tribute driver for it called Beyma Liberty. I have been listening to it for a few hours now and it really has potential as a midbass driver, but not so much for mids. I have not added the aluminum dust cap yet, because when I added one to a JBL 2202 12" I noticed how the sound became more dead (due to the rigidity of the metal dust cap?) and some ringing metal sound. I may keep it as it is, without a dust cap.

The E-120 is an old driver with its own sound. It will be fun to try to use it in a horn or cabinet. The plan was to use it for the electric guitar, since the Meyer 12" are doing such a nice job already.

The search goes on!

Last edited by Rewind; 1st February 2015 at 11:58 AM.
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Old 1st February 2015, 12:45 PM   #318
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Originally Posted by Rewind View Post

The Saba can have its bad days too. If the Saba Greencone sometimes overly excited sound can remind me of a bee-hive, the Tannoy 15" was more like an exhaust pipe of a Husqvarna motocross.

Haha, maybe you should consider a new occupation as reviewer in a Hifi magazine

Peter
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Old 1st February 2015, 01:56 PM   #319
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Ah, that's the thing, I like the rip of the 15" at 100hz to say 120hz or maybe more.
I might find a 12" loses there in dramatic affect.
The bass I have now from my combo is something a single 15" tannoy could only dream of imho, having listened to many tannoy variations from, GRFs to autographs to Westminsters.
I do eq them though

Yes, a 12" straight into my current mid bass horn would never work!
New throat / longer then it looks like it might. Gaining nicer 150hz to 300hz and losing any lower bass push would be a blow though...
I'm running my 2482s down pretty low at the moment...

Last edited by Speedysteve7; 1st February 2015 at 01:59 PM.
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Old 14th July 2015, 07:15 AM   #320
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Little update.
I had some mates round with big power amps. One a Behringer Inuke PA amp and the other a Chord super amp.

The Behringer on the tapped horns was a revelation. The grip and control and bang for buck was something to hear.
For me it did a better job than the 7K RRP big silicone Chord amp for the tapped horns.

Of course the Chord is designed to work very well 20-20000Hz. I only need 20-90Hz 4th order!

The Chord did a nice enough job on the mid bass, but not 6.85K better than the 60w Topping T-amp I was using
I might try other amps for mid bass in the future to see what's affordable and sounds better.

I bought the Behringer amp for tapped horn sub duties. Very happy with the sound.
I've slowed the industrial noise cooling fan using a 13.5ohm resistor. It's about as high a resistance as I can go and get the fan to start.
Noise is low and it still draws quite a bit of air over the PCB and out the front. So a good compromise at the moment.

I will play with fitting a temperature sensitive thermistor - getting a 10ohm one and can add a few ohms needed to get the right start speed. Hair dryer and infra red temp gun at the ready for testing...

I've also been making some adapters for Vitavox S2 for a fellow horn enthusiast and testing his 400Hz horns.

From

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to

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and some screw on adapter rings in brass - outer ring will be polished up when finished, Will also be faced off to 18mm thick so the horn throat contacts the driver.

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Click the image to open in full size.

Last edited by Speedysteve7; 14th July 2015 at 07:22 AM.
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