luni, 29 decembrie 2008

sâmbătă, 27 decembrie 2008

Incinte cu 2 difuzoare pentru bass-VOX 252

VOX 252

Art. No. 5923

Characteristics and sound properties

The VOX 252 is an upright speaker with its subwoofer TIW 250 8 Ohm let into the side-wall. This design enables the front panel to be kept very narrow making it that much easier to position. One of the most outstanding features of the TIW 250 8 Ohm is its unbelievable ability to reproduce the lowest range bass in surprisingly small cabinets. In the listening area, the bass pressure becomes tangible rather than audible, the sort of effect you would normally only expect from much larger speakers. The VOX 252 is, in this respect, well able to keep up with the larger column systems such as the EXPERIENCE V 20. As a result of the side-opening position of the TIW 250 8 Ohm's, the separating frequency between the subwoofer and the mid-range drivers has to be very low. This has been achieved by means of an especially intelligent frequency cross-over design.
In order not to restrict the dynamics at higher bass levels, a bass reflex tube with an exceptionally large cross-section and corresponding length has been designed. In this way, flow-related losses are kept to a minimum. The vent is at the bottom in the rear wall so as not to interfer with the attractive appearance of the front face. If the speaker is to be placed right against a wall, the reflex opening can easily be positioned at the front. The bevel on the front will then, however, have to be narrower.

This version of the VOX contains the high-end ceramic dome tweeter KE 25 SC 8 Ohm. Therefore the crossover was modified in the tweeter section. An 18 dB high-pass produces an optimum phase relationship between tweeter an midrange. This creates an improvement of the clear location of each individual voice or instrument.

Similar products
VOX 200	VOX 251 HE
VOX 252 MHT	VOX 300

Extract from Image HiFi (VOX 251)

"This VISATON system is the final proof that power, impressive breadth of the musical spectrum, rapid response and a fantastic overall sound panorama do not require monster-speakers."
"...VOX, that takes your attention right from the word go, produces clear-as-a-bell sound, builds up tempo easily. And in so doing, makes you feel you're listening to a massive speaker array, in other words, creates a virtual large-sized speaker system."
"... the VISATON grumbled its way solidly through the bass regions in a most pleasing fashion, and even true woofer fetishists will confirm that this is pure black, beautifully controlled bass pleasure."
"This one copes with volume levels normally left to those fridge-sized monsters, and yet retains a clarity and lack of distortion that is reemarkable."

Verdict: excellent

Extract from Klang & Ton

"In comparison with the well-tempered VOX 251, itself a pleasure to listen to, the new version has added yet another rung to the top end of the ladder. Its bass reproduction is measurably more taught and its fundamental range more realistic and sonorous. The really interesting thing, however, is the effect of the new ceramic tweeter on the overall sound picture created by the unit."
"The test representation of an imaginary stage was passed with flying colours, with the musical details coming across beautifully and clearly separated. It is indeed the ability of the system to separate details and generate a finely balanced dynamism, that makes this unit such a strong contender. Add to this a tightly meshed bass department and carefully restrained overall balance."
"Hats off to Visaton, your 252 can easily be compared with ready-made units up around the DM 10,000 price tag, they look good and cost, including materials, around DM 3,000 a pair."

Extract from STEREO

"With their VOX 252, the designers at Visaton in Germany have managed to surpass even the excellent qualities of the predecessor. Midrange sound that is crystal clear, now with better emphasis on the higher frequencies, excellent spatial separation, real dynamism and 'bass for grown-ups'. What more could one want? This VOX can certainly dispense with the assistance of extraneous tweeters and, in addition, it has restored the hierarchical position of its younger sister, the VOX 200."
"The new KE 25 SC ceramic dome will make a stir - of that you may be sure. Thanks to it, this exceptional speaker, named the VOX 252, has been catapulted right up to the realms of high-end units."

Sound quality: 75 %
Value for money: very good

Technical Data:
Nominal power handling	200 W
Peak power handling	350 W
Nominal impedance	4 Ohm
Frequency response	28 - 25000 Hz
Mean sound pressure (nominal)	84 dB (1 W/1 m)
Cut-off frequency	200 / 3000 Hz
Principle of Housing	Baßreflex
Net volume	70 l + 4 l
Outer dimension height	1150 mm
Outer dimension width	235 mm
Outer dimension depth	400 mm

Modul filtru subwoofer cu egalizator si filtru subsonic

Low-pass (subwoofer) filter: 40Hz to 200Hz cutoff (variabila)
12dB/octava High-pass (subsonic) filter: 20Hz 18dB/octava
Cea mai joasa fecventa redata: CC (cu filtru subsonic dezactivat)
Gain: 12dB (variabila)
Egalizator: 12dB boost/cut (variabila)
30Hz la 190Hz frecventa de centru (variabila) Q 5
Distorsiuni si zgomot: 0.03% THD, -92dB unweighted (ref 1V)
Intrari 3: 1 de Linie si 2 de Semnal mare (de pe difuzoare)
Iesiri 2: Normala si Inversata cu 180 (Balansata)
Alimentare +/- 15V Read More......

duminică, 21 decembrie 2008

sâmbătă, 20 decembrie 2008