Tannoy 15 inch passive to active

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#24
In my opinion the lack of deep bass can even be an advantage for Puma users. It allows Puma to be positioned near walls or corners, while bigger cabinets that go lower are difficult to position in home environment where we usually do not have rooms big enough.
 
#25
lowering PUMA's Fs

ivanlukic said:
In my opinion the lack of deep bass can even be an advantage for Puma users. It allows Puma to be positioned near walls or corners, while bigger cabinets that go lower are difficult to position in home environment where we usually do not have rooms big enough.
Click to expand...

You are right!

I will treat Tannies suspensions only slightly with a Beyma "lattex" ( just found in old recone kit, was a 18"G400 if I remember rightly ) primarily to obtain better ageing and then close the gap with original specs.
Probably a stiffer suspension will help me with DSP eq. setting too, and I prefer a lighter, better damped, more responsive cone ( but more picky break up modes in consequence.....)

Time to check Fs and then treat suspensions.....

Regards.
 
#26
I'm not disputing choice of Puma driver ; just making a point about difference between 3808/9 and 3805

as written on Hilberink site : tannoy

Lynx using 3169G two 12" high sensitivity Dual Concentrics in a double cabinet.
Bobcat (B50) using 3169R 12" high sensitivity Dual Concentric in a single small cabinet.
Puma (P100) using 3805 15" high sensitivity, high power Dual Concentric.
Jaguar (J200) using 3809 Puma driver in a larger cabinet for deeper bass.
Panther (P200) using 3859 15" Dual Concentric in a front sectored horn cabinet.
Cougar using 3859 15" Dual Concentric in a floor wedge monitor.
Lion (L300) using 15" bass unit in a coupled cavity bass bin.
Cheetah (C150) using 15" bass unit in a small coupled cavity bass bin.
Leopard (L200) using 15" bass unit in a direct radiating bass bin.
Click to expand...

I think that there is sometimes recognize mix-up between Puma and Jaguar ...... and certain probability of existing DIY cabs of Puma size with 3808/9 in them .

However - judging by my experience shown in linked blog post , one thing is sure - surround impregnation is having aging issues ;
As general rule ( at least to my knowledge ) main factor or system stiffness/compliance is spider , and surround stiffness must be of secondary importance ..... to ensure that coil never came in situation of pushing cone against surround

conclusion - if Fs substantially dropped after soaking cloth surround with Alcohol , surround is either for replacing or for rejuvenating

edit - found some specs fro Wildcat series ; if nothing else - maybe you know from what size of cab your drivers were pulled ....... 😉
 

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#27
@ Zen Mod,
thank for this explication about spider vs surround... 🙂
thank for your blog link too.....i had a nice and very interesting reading last night !

I really don't know which drivers i have.....but i'm shure that are no re-coned and mounted in original tannoy enclosure 🙂

Just checked Fs.....is 58 Hz

Cheers
 
#29
HF coil DC resistance

Hi Marco ,

Like to ask you a favor , since you have original Puma's .
Can you measure the DC resistance of the HF coils ?
Mine were pretty "abused" when I bought them second hand , before I reconed them . The LF voice coils were "baked" probably by heavy clipping amps for a long time . The HF coils looked OK but I can't find any specs on the DC resistance .Mine are not equal , Can't remember the values , but there was a 2 or 3 ohm difference between them .
I'll get them out of the cabinets in the weekend and measure .

Thanks and cheers ,

Rens
 
#31
Charles Darwin said:
... In those as with all pepperpot drivers the notch has two functions:
Modify the 6dB slope so you get a flat(ish) area from xover freq to about 5-6k when you need the 6dB cd horn correction and get rid of the honk.
When going active with those drivers both aspects have to addressed.
It is possible that with the tulip drivers only the former function is needed so when going active only the boost needs to be addressed.
Click to expand...

The pepperpot drivers seem to have made a comeback in the Tannoy prestige series:
Tannoy - Residential - Summary

I have never seen any of the new crossovers, would be interesting how they adress the eq for the pepperpot drivers nowadays.

Charles Darwin said:
I guess somebody would have to simulate those xovers to find out exactly what is going on but I'm lacking the software.
Click to expand...

For simulation you might try Boxsim (it´s free: http://www.boxsim.de/download/Boxsim120en.zip
Description: Downloads )

With generic driver models it will not be exact, but looking at the voltage plots ("frequency response electr.") one can at least evaluate what modifications of part values would do.
Another possibility would be LT Spice with simple speaker models (LR).
 
#32
Yes they did make a comeback despite the fact that the tulips are actually the superior solution.
But it is a fairly cheap stamped metal or even plastic component while the pepperpots are solid machined items and the eyes/brain listen too as we all (should) know.

Thanks for the link but there doesn't seem to to a Mac version so I can't use it.
 
#34
Hi all ,

During the frequency sweep ( checking Fs ) I have noticed a slight noise from inner side of surround
I have seen cranked glue , easy solved with a glue strip all around gasket ( impact glue ).

I will treat the surround inner side with water based Beyma "lattex" after the glue has dried .
When I have seen the result will decide whether to varnish the outside also , because the surround looks so good , a little dry but no noise comes from this part for sure....

Regards


by the way , thanks to Zen Mod for that problem revealed.....
 
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