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Old 14th June 2011, 01:54 PM   #1581
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Quote:
Originally Posted by thetubeguy1954 View Post
Hello Velmeran!

Those two GRS 8FR-8 drivers ---{did you check to see who their actual manufacturer is}--- would probably sound a whole heck of a lot better, and not so bass heavy or light on the upper treble extreme "if" you removed them from that box and placed them in cabinets that are better suited to their specific requirements!

Granted they probably wouldn't remain quite as easy to move around, but they'd sure sound better that way! Of course that's just one man's opinion and if you're very happy with the results you're obtaining from just tweaking the EQ a bit. Then you should just keep continuing doing, what you're doing!

Thetubeguy1954 (Tom Scata)
Certainly the drivers won't sound their best unless I put them in a properly sized cabinet; I'm not blaming the drivers for the bass bloat as that is from the undersized box. Obviously I was working within certain constraints on this project (size, weight, volume output, battery life, etc) and one of the key ones was I wanted to use the Zenith case for the style points.
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Old 14th June 2011, 03:54 PM   #1582
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Quote:
Originally Posted by velmeran42 View Post
Certainly the drivers won't sound their best unless I put them in a properly sized cabinet; I'm not blaming the drivers for the bass bloat as that is from the undersized box. Obviously I was working within certain constraints on this project (size, weight, volume output, battery life, etc) and one of the key ones was I wanted to use the Zenith case for the style points.
Well I can certainly understand that, 'cause the Zenith case is kind of cool looking!

Thetubeguy1954 (Tom Scata)
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Old 14th June 2011, 03:59 PM   #1583
gcl is offline gcl  United Kingdom
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Default A really old DIY effort

Great thread with some beautiful examples. I discovered it while looking for ones built with Hemp FR8. I have a pair of Hemp FR8c which I have yet to build an enclosure for, I am intending to build an Apra Grande (nice one earlier in this thread). I have a history of building things just to find out what they’re like. This picture might intrigue some of you. Sorry about the quality - it is an old photo scanned in.
It is a corner horn. In 1974 Jack Dinsdale published a series of articles in Wireless World on horn loading. I built this corner horn just to see what a horn did. It was a lot of effort for a cheap driver. It used an Eagle 6.5inch FR. It produced a huge room filling sound for very little input power. I can’t really say much about the sound quality –it was a bit shouty I think. I made a plaster of Paris horn to Dinsdale’s data and there was a small rear chamber which coupled the folded horn. A picture of this speaker appeared with reprint of Dinsdale’s articles in the Wireless World annual collection in ’74 or ’75. (I had a copy but someone "borrowed it".) Dinsdale did tell me that it would be better with Lowther PM6 units, which I never followed up. They were much too expensive for me.

I later added a Decca London ribbon tweeter shown in the photo. I used it for a few years then built something else. (A Deccavolt reflex cab with 10inch Volt unit crossing over to the ribbon)
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Old 15th June 2011, 05:03 PM   #1584
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verry cool roemhild,
nice horns
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Old 15th June 2011, 08:43 PM   #1585
gcl is offline gcl  United Kingdom
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As posting my old DIY horn got me thinking about this I searched for Jack Dinsdale's Wireless World articles. I found them. Here is a link to the third part which I followed to build the corner horn all those years ago.

http://www.volvotreter.de/downloads/...le_Horns_3.pdf
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Old 18th June 2011, 07:17 PM   #1586
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Hello Guys, lemme throw my 10 cents into this.

My name is Mikko, I've been working as audio designer for mobile phone industry for 6 years now. As a hobby, I've been building few speakers, usually with some special themes or ideas - it does not make sense to copy others.

My first one was done when we lived in Malmö, Sweden back in 2009 - I did not have any woodworking tools with me (except drilling machine) but had this normal buzz of building something - it comes every summer.

So armed with drilling machine, cheap soldering iron and screwdriver, I was determined I could make cool speakers nevertheless. As a starting point, I decided to use anything I could find from IKEA. Speaker element was chosen with criteria, that it's mounting hole did happen to match the tool I had

This is 3 liter bass reflex, port tuned to 80Hz if I recall correctly. Each box was made from 3 22cm IKEA Blanda Matt fruit bowls + one 12cm bown at the back. Speaker is Vifa TG9FSD10/04, which I can recommend for the price. There is no electrical corrections.

What I wanted to do was to make something which allows me better sound quality for my computer. Idea for the speaker is, that you can point the speakers towards the ear, as the stand is loose from rest of the box. As these speakers are pretty directive, that allows you to fine tune the amount of high frequencies.

Measurements were done in large anechoic from on axis, 50cm. Messy one is from back, nicer is from front. Shelving shape of frequency response was identical to original datasheet, there is similar speaker available with more flat response.

Unfortunately my son (2 years back then) destroyed these pretty quickly by placing a pen through the cone. My wife says these look like Kenny from Southpark, so she just shout "Oh No! They killed the Loudspeakers! Bastards!"

http://www.flickr.com/photos/spinton...7626991188930/
http://www.flickr.com/photos/spinton...7626991188930/
http://www.flickr.com/photos/spinton...7626991188930/

All the best,
Mikko

Last edited by spintonik; 18th June 2011 at 07:30 PM. Reason: links broken, try again
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Old 19th June 2011, 05:17 PM   #1587
rho is offline rho  Belgium
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Looks great!
Are those the same drivers as used in the Picolino 2 ?
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Old 19th June 2011, 06:35 PM   #1588
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Posting for Bernie... i have his Woden Victor beta build in house. Currently with FE166eSR, i'll swap in FE166eN^2 and then his driver sback in after treatment.

Click the image to open in full size.

Click the image to open in full size.

Made of solid Douglas Fir (a pine species), the wood was his floor for 70 years before it was repurposed.

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Old 20th June 2011, 03:53 PM   #1589
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Quote:
Originally Posted by rho View Post
Looks great!
Are those the same drivers as used in the Picolino 2 ?
Hi,

type seems to be different, altough looks are similar. I found Picolino 2's T/S parameters from here:

hifisound eShop*-*VIFA 9 BG 119/8 - FIBRE GLAS*N

And one I used is here:

http://www.tymphany.com/files/TG9FD-10-04%20Rev1_0.pdf

-Mikko
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Old 20th June 2011, 07:39 PM   #1590
rho is offline rho  Belgium
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Looks like they have quite different TS parameters.
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