Just got a pair and the person who had them had removed the ports and lost them.does any one have a set and could provide me with the port dimensions. the hole in the box is around 73mm so guessing it would be a 70mm port so maybe just need the length Thanks in Advance
Hi atcman,
This model seems to be known also as D50, the details of which are in the picture below. In case you don't find the exact details of the port tube, you could still use the enclosure volume of 32.9 litres along with the port diameter to tune the box to your liking. Just make sure it matches the given frequency response that extends down to 42Hz (fifth column).
All the best.
This model seems to be known also as D50, the details of which are in the picture below. In case you don't find the exact details of the port tube, you could still use the enclosure volume of 32.9 litres along with the port diameter to tune the box to your liking. Just make sure it matches the given frequency response that extends down to 42Hz (fifth column).
All the best.
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Thanks for that looking like port could be 50mm and the ribs on flange 72mm any advance someone must have a pair Tucked away,i hope
I'm sure someone will work that out. However, if the ports are missing and the tuning has been compromised then what happens to your warranty (if applicable)? Gone?
They were built in the 80/90s hope someone has some tucked away,so i can get dimensions as Tannoy now for info are as good as a Chocolate Fire Guard
These will probably do the job: 051-0012: Jantzen Flared port tube - 50mm diameter x 143mm length | Hifi Collective
To test you would expect an impedance minimum at the lower corner frequency specified as 42 Hz, ±5-10%. That's the null between the two peaks on the LHS of an impedance sweep. If the frequencey is too low the port is too long and vice versa.
(Picture nicked from here: Speaker impedance curve explained with examples | Audio Judgement)
To test you would expect an impedance minimum at the lower corner frequency specified as 42 Hz, ±5-10%. That's the null between the two peaks on the LHS of an impedance sweep. If the frequencey is too low the port is too long and vice versa.
(Picture nicked from here: Speaker impedance curve explained with examples | Audio Judgement)
Thanks have looked at those but to small i am trying to find someone who has a pair so then once i have the measurement that Tannoy used if i cannot buy i will get some made
Like resistors, capacitors and inductors etc, Tannoy would have purchased an off the shelf port from an OEM manufacturer that was closest to the calculated length required.
If you can't match the exact dimensions, the weight of the air in the port is what needs to be matched (as long as the diameter is fairly close). So if the diameter is not exactly the same chose a length of port that is of the same volume.
Flaring at either or both ends couples a small amount more air at the flared ends, increasing the effective mass a small % and so slightly shortening the port length needed.
Any discontinuity in the port, like a seam or a join, can cause delamination of the airflow at the surface boundary and result in audible turbulence. If you can feel the edge or join with your finger, it may be a problem.
If you have a port that is square cut on the inside end, the flow at the end will also become turbulent. A small radius of 1mm or so will reduce the flow discontinuity by subjectively 90% or more. I run a deburing tool around the inside edge of square cut port tubes to solve this turbulence problem. Many manufacturers seem to be oblivious to it. In fact a couple of decades ago I worked in QA for a speaker manufacturer who used cut PVC pipe for ports. Even though the benefit of radiusing the ends of the port tube was quite obvious, the extra time to do it (a couple of seconds) was an extra cost to manufacture and so it wasn't done!!!!
If you can't match the exact dimensions, the weight of the air in the port is what needs to be matched (as long as the diameter is fairly close). So if the diameter is not exactly the same chose a length of port that is of the same volume.
Flaring at either or both ends couples a small amount more air at the flared ends, increasing the effective mass a small % and so slightly shortening the port length needed.
Any discontinuity in the port, like a seam or a join, can cause delamination of the airflow at the surface boundary and result in audible turbulence. If you can feel the edge or join with your finger, it may be a problem.
If you have a port that is square cut on the inside end, the flow at the end will also become turbulent. A small radius of 1mm or so will reduce the flow discontinuity by subjectively 90% or more. I run a deburing tool around the inside edge of square cut port tubes to solve this turbulence problem. Many manufacturers seem to be oblivious to it. In fact a couple of decades ago I worked in QA for a speaker manufacturer who used cut PVC pipe for ports. Even though the benefit of radiusing the ends of the port tube was quite obvious, the extra time to do it (a couple of seconds) was an extra cost to manufacture and so it wasn't done!!!!
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Found some with correct size flange now just need to find the length that tannoy used so i can cut to size just hope someone has a pair they can measure as i want to hear them as Tannoy intended before i would go down the calculating modding ect Rabbit hole
Don't forget the internal diameter and taper are just as important as the length, because it is the mass (weight) of the air in the vent that is doing the work by bouncing up and down on the springiness of the air inside the box, not the dimensions of the port per se that 'tunes' the alignment. Having said that, there's a good chance if the exterior flange and mounting is the same that the internals will be too, in my experience. Good luck!
Atcman,
The following is a lot of information on Tannoy speakers, in general. Do check the link that says "Database of all Tannoy driver models and cabinet models". You might find your model and its details among these (not sure though).
Tannoy tech info
Good luck.
The following is a lot of information on Tannoy speakers, in general. Do check the link that says "Database of all Tannoy driver models and cabinet models". You might find your model and its details among these (not sure though).
Tannoy tech info
Good luck.
Great reading but no help for my model unfortunately also looking to find some for sale so i can contact the owner to see if they will measure for me, does anyone know of any D50 or 635
I don't believe any seller would even reply to such an enquiry that not doesn't relate to buying in any way. Besides, it involves him removing screws and measuring things. I really don't understand why it is that you think someone would do all that, just for you.
Why don't you contact Tannoy themselves? From what I can see, they are still at England. And, according to the Tannoy monitor gold website, spare parts for most of the sixer models are still available. Even otherwise, there's still some chance they might share some information on the port tube/cabinet tuning (drawing etc.). All you've to do is talk / write nicely.
In case you still think you're chances are slim, share the woofer part number here to see if someone has its parameters. Alternatively, you may tune the box to the resonant frequency (fs) of the woofer (last resort).
Why don't you contact Tannoy themselves? From what I can see, they are still at England. And, according to the Tannoy monitor gold website, spare parts for most of the sixer models are still available. Even otherwise, there's still some chance they might share some information on the port tube/cabinet tuning (drawing etc.). All you've to do is talk / write nicely.
In case you still think you're chances are slim, share the woofer part number here to see if someone has its parameters. Alternatively, you may tune the box to the resonant frequency (fs) of the woofer (last resort).
Tannoy now moved to china no phone number available,that was the first thing i tried, and to even ask them a question you have to register (lifetime of junk mail) as to work involved put a tape measure in the port ie no work or screws involved driver is a 2046.
Hello,
You can try this with a piece of PVC pipe of the diameter of the hole and calculate the length with this online calculator :
Woofer Port Calculations
For example, for a volume of 32.9 litres and a vent diameter of 66 mm, the calculated tuning frequency is 42 Hz.
In imperial measurements, see the attached image.
If you want something more aesthetically pleasing, a Monacor MBR-70 would be suitable and you could adjust the length to the desired tuning frequency, but a 2.6 inch diameter, 5 inch long vent would do.
MONACOR: MBR-70
Cheers.
Attachments
Well, this is according to WINISD. Note that it's the -3dB corner that is 42Hz in this calculation, with box tuning at 47Hz.
The variable tuning telescopic tube suggested by Glyptoron is very a good idea, as reality is often slightly different from simulations.
The variable tuning telescopic tube suggested by Glyptoron is very a good idea, as reality is often slightly different from simulations.
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