Hi, have a couple of Axiette 8in speakers, and was looking around for a cab design. I know very little about the speakers, but i have the recommended enclosure plans which are BR. The total volume is similar to the fostex DBR for the FE206en, and so I was wondering if there was any reason why I shouldn't try these. Any advice appreciated - either on the application of this enclosure, or the drivers themselves. I am only running 3watts per channel, so am looking to get max efficiency out of the speakers.
Do you have any photos or TS parameters to post? I don't know what this driver looks like (and probably many others don't either) - it's an antique, right? Having TS params either from manufacturer or measured will help. Otherwise it's difficult for us to help suggest a box.
thanks for the response. Unfortunately, as far as I can gather there were never any published TS parameters. My basic question (and I admit that i didn't present if very clearly) was: given that the internal volume of the BR enclosure published with these speakers is almost identical to the total internal volume of the Fostex DBR enclosure, would I be able to substitute one speaker for the other.....or at least would it be worthwhile trying.
These are british made speakers - so probably not so common in the US, we seem to have quite a few floating round here in NZ though.
Appreciate any comments at all. Especially if someone has put one of these in a box, and has some comments on what they observed.
thanks again.
These are british made speakers - so probably not so common in the US, we seem to have quite a few floating round here in NZ though.
Appreciate any comments at all. Especially if someone has put one of these in a box, and has some comments on what they observed.
thanks again.
There are parameters for what seems to be 2 versions of the Axiette II:
Paramètres de THIELE et SMALL des haut-parleurs
It's in french, but just scroll down a bit to the 21cm section, where links for the drivers will lead to parameters.
While the enclosure volume may be similar, the tunings may not be.
Inputting the parameters for the "vp1" driver in Hornresp, I have a hard time coming up with a Fostex-style DBR design that'd be worth the extra hassle IMO. Perhaps because of the medium-high Qts of the driver? It might not like that small initial chamber. A simple 60L enclosure tuned to 45Hz look dandy to me. Make it golden ratio for the appropriate old-school look. 🙂
Paramètres de THIELE et SMALL des haut-parleurs
It's in french, but just scroll down a bit to the 21cm section, where links for the drivers will lead to parameters.
While the enclosure volume may be similar, the tunings may not be.
Inputting the parameters for the "vp1" driver in Hornresp, I have a hard time coming up with a Fostex-style DBR design that'd be worth the extra hassle IMO. Perhaps because of the medium-high Qts of the driver? It might not like that small initial chamber. A simple 60L enclosure tuned to 45Hz look dandy to me. Make it golden ratio for the appropriate old-school look. 🙂
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thanks so much - this was all very helpful, and I had decided to go with the original plans. However on starting the project, I opened the boxes to find that the drivers were actually Twin Axiom 8. Unfortunately I can't find any information about enclosure design for these - can any one help me with some basic dimensions - I assuming that the recommended design will be BR. I screwed them onto an an open baffle for fun, but it sounded a bit shoutie to me. They are unused, and so some run-in may be required. I have included a link to some photos below. Any help would be much appreciated, and I promise to share my findings.....as there seems to be almost nothing about these on the net.
http://media.photobucket.com/user/bchang2226/media/Goodmans.jpg.html?filters[term]=goodmans%20twinaxiom%208&filters[primary]=images&filters[secondary]=videos&sort=1&o=0
http://media.photobucket.com/user/bchang2226/media/Goodmans.jpg.html?filters[term]=goodmans%20twinaxiom%208&filters[primary]=images&filters[secondary]=videos&sort=1&o=0
All I could find about Twin Axiom 8 is a supposed recommended enclosure volume of 30 liters, just over a cubic foot. It would be best to measure the parameters yourself with LIMP and an easy to build impedance jig. Short of that, a decent stab in the dark would be to start with a sealed enclosure of said 30L volume, which I would make with the following internal dimension: 7.5" x 12.25" x 20".
Testing them with either a BSC circuit or with their backs to a wall, if bass is still weak, install a 2" diameter round port of 6" in length. This should tune to ~32Hz, most likely lower than needed. Trim it by 0.5" until bass is satisfactory. Use blu-tak or similar putty to seal it to the box during this phase.
Testing them with either a BSC circuit or with their backs to a wall, if bass is still weak, install a 2" diameter round port of 6" in length. This should tune to ~32Hz, most likely lower than needed. Trim it by 0.5" until bass is satisfactory. Use blu-tak or similar putty to seal it to the box during this phase.
a classic dual chamber reflex with 3 identical vents (two tuning to fb) is one way to go. IIRC, one Axiom was top of the recommended list for Karlson.
a classic dual chamber reflex with 3 identical vents (two tuning to fb) is one way to go. IIRC, one Axiom was top of the recommended list for Karlson.
A DCR would be more sensitive to mis-tuning from unknown parameters of course. Good looking enclosures there. There are a few Karlson on Ebay right now, including one factory K15 and a 115BK, all at ridiculous asking prices though.
Agreed, we really need measured specs; otherwise, I'm inclined to go larger based on this: http://www.diyaudio.com/forums/full-range/133807-goodmans-twin-axiette.html#post1669373
Then again, based on the above's 65 Hz Fs, all these alignments seem good ones to choose from: Paramètres haut-parleur de THIELE et SMALL, sans filtre ni ampli
GM
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My Axiettes has a higher Q than that about 1. Frequency response is OK as is sound but frankly I like the Philips 6.5" drivers I gave away better.
My Axiettes has a higher Q than that about 1. Frequency response is OK as is sound but frankly I like the Philips 6.5" drivers I gave away better.
Thanks again to everyone who responded - I have been looking up measuring the TS parameters, and the process doesn't seem as daunting as I have anticipated - so I will give it a shot. I am going to mock up a test box at 30l/s anyway and see how that goes.
DrBoar, is this SPL graph for one of your axioms? It is lower than I was expecting - I was hoping to get around 95 out of mine - in order to complement the 3watt amp I have. What is the enclosure type?
Thanks again to all.
I did not measure them with a specific voltage. My guesstimate is that the fall in the 90-95 dB range. Much less senitive than say Fane Studio 8M but more than KEF B200.
You will find a lot of info on my blogg but it was a bass reflex box. With onken style vents and a removable front panel.
You will find a lot of info on my blogg but it was a bass reflex box. With onken style vents and a removable front panel.
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Fairly typical of such vintage drivers. I've had Richard Allan CG10T and CG8T, Philips AD9710 and AD7060, all within that range.
A 3W amp would ideally need more efficient speakers than this to deliver anything close to realistic SPL's, more like nearing 100dB/W/m and up, not that the combo can't sound good given that limitation. I've run 2.5W into somewhat less efficient systems and it sounded good within its allowable range.
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