Guido mdf H9800 clones that need work.

[cooky1257]

Well the H9800's arrived from Herve but I have a few issues;

Here's what I was expecting:

https://farm8.staticflickr.com/7380/13903561316_14322648ce.jpg

..and nice crisp cnc'd throats like this one:

https://farm4.staticflickr.com/3754/13903682772_7bedd9a09a.jpg

Here's what I have:

https://farm4.staticflickr.com/3718/13927348654_bcac1e75d8.jpg

A festival of dodgy drilling but more importantly the throat entrance isn't circular and the horizontal curve at the throat is bumpy. It looks like an epoxy filler was used for the repair.

If I'd known of these issues before hand I'd never have bought them.

Thing is I need info on what was used for this throat repair so I can put things right......

Cooky

[Ian Mackenzie]

Bugger, Lucky you did not pay thousands for it!

Looks like it unbolts?

If it does and you can do a good clean up job why not make a mould with this horn and cast a pair of clones from resin or other material .....there is always a silver lining old chap.(I mean they did such a good job of negatively engineering it in the first place)

Ps Wills, Kate and baby George send their regards down down under

[cooky1257]

Do pass on my best to the little rugrat...
Bugger, Lucky you did not pay thousands for it!

Looks like it unbolts?

If it does and you can do a good clean up job why not make a mould with this horn and cast a pair of clones from resin or other material .....there is always a silver lining old chap.(I mean they did such a good job of negatively engineering it in the first place)

Ps Wills, Kate and baby George send their regards down down under

[Ian Mackenzie]

Everyone loves the little fellow.

[herve M]

"dodgy drilling": Sorry, there were holes in 2435, I drilled for my 2451 and new holes too close to the previous one. it is not visible so no serious

"throat entrance isn't circular and horizontal curve at the throat is bumpy"
I do not know that they are not good, I would like an explanation from Guido?:confused:

ps: Difficult for me to understand everything that is said because I do not practice English and uses google translation

[cooky1257]

Herve,

I accept what you say. You have behaved like a perfect gentleman in resolving this amicably.



"throat entrance isn't circular and horizontal curve at the throat is bumpy"
I do not know that they are not good, I would like an explanation from Guido?:confused:

[cooky1257]

The black makes it difficult to photograph but the irregularities/bumps can be seen here.

https://farm3.staticflickr.com/2925/13947035425_ff5b9dd517.jpg

2 nervous hours and one half down...3 to go...


https://farm8.staticflickr.com/7381/13938894115_bae05b1067.jpg

fortunately matching the mold/template of the 'good' throats thus far only required removal of filler. The lacquer/coating/filler looks hard but is soft as sugar.

It may get a bit of a pain if I need to build/add material..

https://farm3.staticflickr.com/2939/13938990883_17306f5eec.jpg

[cooky1257]

Finally the 'repairs' have been repaired:)

Done! Phew!!

https://farm4.staticflickr.com/3804/13930724881_f27fd7f1a7.jpg


https://farm4.staticflickr.com/3674/13930777221_64ab33a2a0.jpg


Just some respraying and plate hole drilling and they're good to go.

[cooky1257]

Had I bothered to check before drilling, I would've discovered the holes in the metal plate don't correspond to 2435/2452 mounting pattern :banghead:

[Lee in Montreal]

Something tells me that you might as well sand all the black paint, then reseal with catalyzed primer just to make sure there will be no reaction between the new paint and the old surface. It can be frustrating to prepare a surface and see bubbles or wrinkles start as soon as you pray it. It will be well worth it at the end.

[Mostlydiy]

Had I bothered to check before drilling, I would've discovered the holes in the metal plate don't correspond to 2435/2452 mounting pattern :banghead:

Thats a shame. What system are you aming at with these horns?

/Mostly

[cooky1257]

See my avatar; Me150h/H9800/2452/Truextent.
Bought these to compare to my own H9800 clones.Filling and redrilling is no big deal just annoying.
I think I will take the black back and refinish them with a less gloss more satin/matt black.

[herve M]

Had I bothered to check before drilling, I would've discovered the holes in the metal plate don't correspond to 2435/2452 mounting pattern :banghead:


See with Guido.
I think Guido uses 2450sl with holes different of other compression driver

[cooky1257]

See with Guido.
I think Guido uses 2450sl with holes different of other compression driver


Thanks Herve,

102mm PCD?

[herve M]

:confused: :confused:
Here by subwoof
bolt pattern 2450sl and 2452 identical
http://www.audioheritage.org/vbulletin/showthread.php?35014-4-quot-coil-Nd-driver-history-revisited&highlight=2451+2452+2435


Guido must ask for what engine it manufactures its plates. I sold my 2430 before trying H9800 and I redid my holes for 2451.

[Guido]

Thanks Herve, 102mm PCD? If there is a 4" bolt circle on the adapeter plates it was very likely made for a driver with a 4" bolt circle (e.g. Radian 951PB 1,4" exit). Makes sense, or not?
We sell lasered adaper plates for other bolt circles also...just as an alternative for hand-drilling. Beside 1.5" we also sell 1.4" horns

The 1,4" possibility would also explain the "irregularities" of the throat.

Whatever, if a clean, new horn is needed it can be ordered with a matching adapter plate. Easy. The new horns look a lot better also.

[cooky1257]

Plates have 1.5" hole, 4" bolt circle-soon to have also a 3.25" bolt circle.

https://farm6.staticflickr.com/5252/13969642936_6b294d9c1c_o.jpg

Very nice horns Guido.


If there is a 4" bolt circle on the adapeter plates it was very likely made for a driver with a 4" bolt circle (e.g. Radian 951PB 1,4" exit). Makes sense, or not?
We sell lasered adaper plates for other bolt circles also...just as an alternative for hand-drilling. Beside 1.5" we also sell 1.4" horns

The 1,4" possibility would also explain the "irregularities" of the throat.

Whatever, if a clean, new horn is needed it can be ordered with a matching adapter plate. Easy. The new horns look a lot better also.

[Guido]

Plates have 1.5" hole

That is really confusing then. Contact me again if you need further help.