Can this be doped ?

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karatestu
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Re: Can this be doped ?

Unread post by karatestu » Tue Aug 08, 2017 4:29 pm

Take this....

Image

and this steel angle

Image

8mm by 73mm........oooo feel the girth

Image

To produce this.....

Image

When de-rusted and hammerite black painted on should be ok. Just need to fill in the sides and back panel and jobs a good un. Weighs a ton already :grin: just with those 4 angle sections in.
Last edited by karatestu on Tue Aug 08, 2017 4:38 pm, edited 1 time in total.
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Dr Bunsen Honeydew
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Re: Can this be doped ?

Unread post by Dr Bunsen Honeydew » Tue Aug 08, 2017 4:34 pm

:shock:

:epopc:

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karatestu
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Re: Can this be doped ?

Unread post by karatestu » Wed Aug 09, 2017 6:22 pm

Cut the angle 8mm steel for the other speaker today and removed the rust. No pics today.

Looking online regarding steel lined speaker cabs i found this (just inquisitive)

Acoustic Energy AE1

Uses 5mm steel plates inside, front baffle is MDF + 10mm Aluminum, speaker cone is metal (Aluminum ?) like the MS902S but not continuous profile.

AE1 has a crossover :roll: , a bloody port :roll: and is £2000 :o :o :o :o :o

Probably stuffed full of god knows what as well.

Anyway hifichoice seem to see the benefits of a rigid, high mass enclosure :grin:
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Simon Hickie
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Re: Can this be doped ?

Unread post by Simon Hickie » Wed Aug 09, 2017 10:09 pm

So that's about £200 worth of components, at best. The bass/mid is likely to have some breakup hence the third order (!) crossover at 3khz.
“The reasonable man adapts himself to the world: the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.” George Bernard Shaw.

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Re: Can this be doped ?

Unread post by Simon Hickie » Wed Aug 09, 2017 10:19 pm

From a stereophile review:

"The crossover, which is mounted on the rear of the recessed terminal panel—good-quality five-way binding posts are fitted—acts at 3kHz and consists of a third-order Butterworth, 18dB/octave high-pass leg and a 24dB/octave low-pass leg with a phase-compensating network. The low-pass section uses iron-dust-cored inductors, the high-pass air-cored coils. Both use low-loss polyester capacitors. (I must admit that I raised an eyebrow at this, polyesters, in my opinion, not being as sonically neutral as, say, polypropylenes.)"

For low-loss polyester, read low cost.
“The reasonable man adapts himself to the world: the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.” George Bernard Shaw.

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karatestu
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Re: Can this be doped ?

Unread post by karatestu » Thu Aug 10, 2017 6:47 am

Hi Simon,

I had not looked at any more reviews of the AE1 so thanks for the info. It is a bit off topic but the steel lining is what got me interested.

Since joining this forum i am becoming more and more able to spot & translate marketing :Bllocks: like the capacitor one you spotted. Anyway Simon, you seem to know a fair bit about speakers. Glad to have you around.


Found an article on a Leema acoustics speaker - 1.2mm steel cab with bitumen damping. Designed on the bbc principles. Oh dear

http://theaudiophileman.com/lemmas-xen- ... art-leema/
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Classicrock
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Re: Can this be doped ?

Unread post by Classicrock » Thu Aug 10, 2017 9:10 am

karatestu wrote:
Wed Aug 09, 2017 6:22 pm
Cut the angle 8mm steel for the other speaker today and removed the rust. No pics today.

Looking online regarding steel lined speaker cabs i found this (just inquisitive)

Acoustic Energy AE1

Uses 5mm steel plates inside, front baffle is MDF + 10mm Aluminum, speaker cone is metal (Aluminum ?) like the MS902S but not continuous profile.

AE1 has a crossover :roll: , a bloody port :roll: and is £2000 :o :o :o :o :o

Probably stuffed full of god knows what as well.

Anyway hifichoice seem to see the benefits of a rigid, high mass enclosure :grin:
The AE1 never sounded that great usually paired with Audiolab so I hope you get better results. Anyway less than the £800 or so they cost back in the 80's.

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Re: Can this be doped ?

Unread post by Simon Hickie » Thu Aug 10, 2017 10:08 am

Thanks for the kind words Karatestu. I'd never claim to know as much as some others on the forum but i do try to keep an open mind and question 'conventional 'wisdom'. As George Bernard Shaw said, "The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man."
“The reasonable man adapts himself to the world: the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.” George Bernard Shaw.

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Re: Can this be doped ?

Unread post by _D_S_J_R_ » Thu Aug 10, 2017 10:37 am

The original AE1 had metal cone drivers, which in their case meant a tin-can take-off in the mid hf (8khz). All the crossovers in the world can't mask it completely and it's been found that just acoustic coupling at this frequency by the tweeter can have audible effects as the cone rings in sympathy. We used them with Naim and they didn't sound so bad I remember. I wonder what doping could do to this kind of cone?

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karatestu
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Re: Can this be doped ?

Unread post by karatestu » Thu Aug 10, 2017 4:26 pm

_D_S_J_R_ wrote:
Thu Aug 10, 2017 10:37 am
The original AE1 had metal cone drivers, which in their case meant a tin-can take-off in the mid hf (8khz). All the crossovers in the world can't mask it completely and it's been found that just acoustic coupling at this frequency by the tweeter can have audible effects as the cone rings in sympathy. We used them with Naim and they didn't sound so bad I remember. I wonder what doping could do to this kind of cone?
The MS902S I am doc modding have continuous profile aluminium cones for mid/bass. I have already doped them so I will be able to answer your question fairly soon I hope. With there being no dust cap in the centre the bison kit just settled in the bottom of the cone. May need more, won't know until I listen to them. Oh and I will see what a coat of plastidip brings to the party too :epopc:

Regarding metal dome tweeters - every pair of speakers I have (3) uses them except my doc mod Marantz imperial 7 (not finished yet :roll: ) which I have I visaton G25 for . I am going to have a go at doping the rear of the metal dome tweeter on these MS902S with plastidip and see what happens. May do it to others as well if results are favourable :pray: :pray:
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