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-   -   Anatomy of a £20 pair of speakers (http://www.diyaudio.com/forums/multi-way/225203-anatomy-20-pair-speakers.html)

sreten 7th December 2012 06:40 PM

Anatomy of a £20 pair of speakers
 
Hi,

Being bored with not taking something apart
for a while on a whim I bought these today :

Tibo EDGE MINI Black | Speakers Per Pair | Richer Sounds

http://www.richersounds.com/showimag...max_height=260

£30 elsewhere and claimed retail price of £50.

To put that last point to bed you can get these for £50 :

Wharfedale DIAMOND 9.0 Black | Speakers Per Pair | Richer Sounds

http://www.richersounds.com/showimag...max_height=260

And there is no real competition in terms of build quality.

Still £60 gives the speakers for 5.1 and one spare.

Unusually for me I plugged them in a system they have
no right to be in and formed some opinions before taking
them apart, and they are pretty good for £20 a pair.

1) They are AV speakers designed to be high pass filtered.
Run full range bass distortion is an issue at sensible volumes.
(Probably is filtered, but 5 rather than 2 will help levels.)

2) Sound best near wall and axis crossed a little in front
of the listener, though axis straight on is not too bad.

3) No glaring faults, but vocals tend to dominate music,
probably a good trait for AV, but outside the vocal range
there is not much insight and a general "opaqueness",
I guess the latter depends on what you are used to.

4) Low bass is missing and upper bass a little
tubby near wall. AV filtering may fix the latter.
(Still for the size, pretty decent bass overall.)

5) At low levels tone controls help, but not much
at higher levels, which overall is a good sign.

Overall impression is a decent attempt, but a small,
budget, low tech bass/mid struggling with limitations
as you turn the wick up, surprising at modest levels.
They get better as you turn them down, relatively.

rgds, sreten.

Further details and photos to follow as I take them apart.

FWIW they get slaughtered by my favourite budget speakers :

Wharfedale CR30.4 Black | Speakers Per Pair | Richer Sounds

http://www.richersounds.com/showimag...max_height=260

But they are five times the price ;).

sreten 7th December 2012 08:29 PM

Hi,

Some further listening tests at lower volumes later at night indicate
that they are thoroughly competent and IMO a bargain at the price.

Bass and distortion improves a lot as you drop overall SPL levels.
Frustrating is turning up the wick doesn't give what you expect.

rgds, sreten.

Will still take them apart etc. but doubt I'll break them up for parts.
Roy Orbison sounds rather good at reasonable volumes.

Richard Ellis 7th December 2012 09:42 PM

I would bet the enclosure is super cheaply made..made out of virtual cardboard. I would bet the whole thing would collapse onto itself if you whacked it hard with your fist.
The crossover probably has has the woofer going full range, well into break-up.
The woofer looks like those used in the current JBL & Infinity units........
Hope you can get some TS parameters.

Have fun!!!

-----------------------------------------------------------Rick.........

sreten 7th December 2012 10:23 PM

Hi,

The same with other stuff, the lower your preferred listening level the
better they sound, not something I've particularly noticed before.

rgds, sreten.

sreten 7th December 2012 10:36 PM

Quote:

Originally Posted by Richard Ellis (Post 3275298)
I would bet the enclosure is super cheaply made..made out of virtual cardboard.
I would bet the whole thing would collapse onto itself if you whacked it hard with your fist.
The crossover probably has has the woofer going full range, well into break-up.
The woofer looks like those used in the current JBL & Infinity units........
Hope you can get some TS parameters.

Have fun!!!

-----------------------------------------------------------Rick.........

Hi,

Details will follow, and you may be very surprised. As I've given
opinions without dissecting them yet, we will see. I like them.
We will see if my opinions relate to the technical details.

rgds, sreten.

FWIW the 6" wide by 7" deep by 9" high cabinets are probably worth
the asking price to most DIY'ers on there own *. I'm no mug, and
crap cabinets are not part of my impressions so far, unlikely in reality.

I'll also stick my neck out and say the x/o is going to be better
than the single capacitor to the treble regime, again we will see.

* double layer the front baffle for most FR's. £10 a cabinet is cheap.

Moondog55 7th December 2012 11:25 PM

Those look just like the speakers from one of our local chain stores (DSE) I actually bought a pair for a lady I was seeing who had no music in her flat.
That pair had the woofer running full and a small cap in series with the tweeter.
Personally I thought that the tweeter was causing all the distortion when pushed and when a local store offered me a second hand Jamo silk dome for $20- I opened them up and routed out for the bigger tweeter and added some dense polyester wadding and a single layer of 25mm eggcrate foam
Adding a small coil on the woofer and a "Close to book value" second order on the tweeter made them quite respectable, they are being used by a niece at the moment still going after a decade.
Over here they retailed at around $50- a pair I couldn't make the boxes that cheaply

sreten 8th December 2012 08:12 AM

Pre-op : the known, claimed and apparent facts
 
Hi,

Spec :

50W short term power handling
4-8 ohms impedance
2 way bass reflex
100mm long throw woofer
20mm soft dome tweeter
"high quality" push terminals
70-20,000Hz frequency response
MDF cabinet with profiled edges
232 x 147 x 190 (H x W x D) mm.
1.85Kg each
designed and developed in the UK

Info from inspection :

The cabinet depth is 170mm - 190mm includes the 10mm stock grille.
Tweeter is 75mm in overall diameter (plastic faceplate)
mid/bass unit is 115mm overall diameter (thin folded pressed steel)
The rear terminal block includes a wall mounting "keyhole"
- which will block off the :
rear mounted port, 90mm long, 32mm diameter, flared exit
Seen through the port, midbass unit is marked 4 ohms
midbass unit is not shielded
Knock test gives a different signature to front, back, top and side

Some quick number crunching and assuming 10mm stock
yields an approximate box volume of 4L tuned to 70Hz.
12mm yields

rgds, sreten.

To follow : post op facts and photos

firestorm 8th December 2012 08:45 AM

Interesting post Sreten - I'm surprised at what you can get for the money. I'm wondering how they can be manufactured, transported and then retailed at that price level? They must be less than £5 at the factory gates !

I presume the Diamonds are a better choice for garage/kitchen duty ? Say driven by a cheapy class d amp.

jerome69 8th December 2012 08:53 AM

Wait for the photo ;)

Look like this model : Eltax - Concept Mini

High quality build ! paper woofer ?
Can you measure them ?

gornir 8th December 2012 09:14 AM

It would be nice to see some basic measurements of these budget speakers and to see the designer's design choices based on the driver unit capabilities.

As a start:
  • Impedance
  • Frequency, on and off-axis
  • Distortion
  • T/S parameters

Regards

/Göran


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