Lo and behold, exactly as promised by the Viganoni theory, the midrange was clearer and the bass seemed slightly more articulate. The frequency response at all frequencies from zero to half the sampling rate can be represented by a modulus spectrum of ... Modal resonances usually appear as circles when a Frequency Response Function (FRF) is plotted in real versus imaginary form or as clearly defined peaks when the FRF is plotted as a modulus spectrum. The ability to fit in with rolled off speaker environments or smaller speakers – which is its natural habitat – and to be able to delicately augment a set of bigger floorstanders, is due to the T-Zero’s ability to provide just enough bass for the job at hand, without getting carried away. T-Zero is built using a super stiff cabinet construction that drives the resonant frequency higher so it is more easily damped by our instrument-grade bracing. It’s a musical little beast, definitely suited for stereo environments, and in the right system, it’s a pleasure to listen to (I’ve heard more articulate units, albeit at a price point well above the REL’s) but users need to bear its ultimate limitations in mind when deciding to buy – if you want 20Hz flat, then you need a bigger box, end of story. Of course, there’ll be some combining of output of the two bass systems and this is usually what causes problems when trying to get a sub to work in a system with bigger speakers; it’s much easier with speakers that aren’t quite as bass capable. for some time, and it seems to have taken a long time to The price means that it’s possible and tempting to run a pair of them because two is almost always better than one when it comes to subs. What can be a mighty pain, was more or less a simple matter of dialling down the sub to get its contribution to subtly add to the bottom end of the speakers without creating too much of a bass peak. Learn how your comment data is processed. end. The frequency response of continuous-time systems gives another view, just as it did for discrete-time systems in Chapter 6. ’…Å_î“ #Hǘ$¶š ÕŒÛrÇÆâ¿€S| %!æÈ. The company is into good subwoofers, the kind that are intended to make music, not go boom. The response may be given in … The gloss surface is gorgeous! A frequency response function can be formed from either measured data or analytical functions. Bottom end extension is limited (as expected) with REL claiming a modest 38 Hz at -6dB in room. Okay, here's my question. Vorkasse, Kreditkarte, EPS € 12,-. ¼!oÀ[òüJ~�\²N‰:eNÎÁ�ìÀBğùüF�µåZ‹µ¶ à’\‚-Ù‚Yߢ¾e}‹ú–Y,²Xf±Èb™Å"‹e‹,–�Y²8:888:888:888:888%+˜}úº5yY˜Q�QX_P_X_P_X_P_X_P_˜Q�QØKĞK˜W�WØWĞWØW–¾œ¹`æÂ9æ œƒ`Âw*x§Â™f¢œ‰b&J…¿Ò_á¯ôWø+ışJ…¿Ò_á¯ôWø+ışJ…¿Ò_á_¡o‘åx¦*Èx¦2ú®éOøøï_9¶AÜ­æk�µ×âöZ¶ô²¯°£úÁíúiœL\…_òO€ h\ük endstream endobj 52 0 obj <> endobj 53 0 obj <>stream A REL is designed to augment the performance of “full range” speaker systems in order to provide, in certain cases, linear response below 12 Hz. There’s method to this seeming madness, according to REL: “The purpose of connecting to the speaker output terminals is one of the unique secrets of REL’s success. Amplifier: 100W Class D. Dimensions (WxHxD): 216 x 241 x 260 mm. Thanks for teh great review. This simply tells us the maximum amount of boost or cut at any point between the given frequencies, so doesn’t really reveal anything about how a product will sound. That’s due to design and size, but of course its limited extension means that you wouldn’t use it to add bass to a set of speakers that reach way down low already. I don't think pseudo is a word all by itself, not even in 18.03, circular. All of our designs are true Sub-Bass Systems, meaning they are designed to reproduce What I know is that damping is generally just a multiplication coefficient in frequency response type of analysis and thus sometimes it is difficult to simulate real damping which is a time domain phenomenon into a frequency response simulation. We utilized 5 full coats of lacquer, and solid aluminium feet and badging because REL owners understand quality must extend throughout a product, not just in the most obvious locations. always thought the bottom end lacked some punch although the mid and highs are very sweet. Going for a higher end model would be my choice though. I guess it should be circular pseudo-frequency, or I don't know how you say that. The midrange benefits vanished as expected, but what was surprising was just how easy it was to get the REL to integrate with the system. Fortunately, with my amplification chain there are a number of ways to connect a sub, expressly intended to roll off the signal sent to the main speakers, allowing them to do what they do best (upper bass upwards) and passing the full signal to the sub, thereby allowing it to do its job and recreate the low bass. The T-Zero is fitted with aluminium feet with a matching badge on top, and even the bolts holding on the control panel are the polished T-304 stainless steel type – this little sub is beautifully put together, especially considering the price. It’s finished in nine coats of hand rubbed black (or white) piano gloss lacquer, further polished on a rouging wheel using jewellery buffing compound and then hand polishing using micro fiber cloth and automotive waxes. Entertainment for Grownups – Hi-Fi, Home Theatre, Music, Movies, TV & Film, Gaming, Gadgets and more! for any real, even impulse-response .Thus, the frequency response is a real, even function of .A real frequency response has phase zero when it is positive, and phase when it is negative. Lower Frequency Response: 38 Hz at -6 dB in room. In a word – impressive. Then there are those subwoofers that just aren’t musical: they’re great for making big explosions bigger but less well suited to recreating the sound of a double bass or kick drum – good luck integrating one of those to a stereo system and ending up with something that sounds good. Sorry, your blog cannot share posts by email. 36 Bewertungen Lieferzeit 2-7 Werktage . A frequency response function expresses the structural response to an applied force as a function of frequency. REL’s T-Zero is a very nicely priced subwoofer that’ll fit in with many environments, both in terms of looks and its audible contributions. When it comes to hooking up the T-Zero, users will find that REL takes a different approach to many subwoofer manufacturers. Amplifier Type: Class D . They’re totally accepted and even loved in the home theatre environment, but somewhat scorned in stereo environments by much of the audiophile community. A LFE input is also provided, and the speaker level and the LFE input can be run simultaneously and set up differently with their own controls to allow users to effectively have a “hi-fi sub” and a “home theatre sub”. Your website has definitely offered me personally with just the facts that I actually required. However, the sub integrated with the room better than the speakers do, creating fewer high pressure bass nodes. ‰³- endstream endobj 50 0 obj <> endobj 51 0 obj <>stream Ähnlich wie die FFT-Analyse ist FRF typisch für ein System, welches eine von einem bekannten Eingangssignal gemessene Rückmeldung hat. Just bought two of these to match my B&W 685 s2. Okay, so this is its pseudo-period, pseudo-frequency, pseudo-circular frequency, but that's hopeless. The premise of T-Zero is to bring quality, the full REL connectivity suite, long throw drivers and powerful, reliable amplifiers to a new lower price point and dimension. Frequency response is $1/(1−ce^{iw})$, if you want to get amplitude information you just need to get the magnitude of this complex function and its phase will be the inverse of the phase of $1/(1−ce^{iw})$ or We at REL believe this is an incomplete approach and that loudspeakers need to be extended in the lower frequencies for true full range reproduction. The cabinet is described as being “super stiff” and designed to drive up the resonant frequency to allow the damping of the “instrument-grade bracing” to be more effective. The cleaner midrange and better overall bass quality came as no surprise, because I’ve indulged in this experiment before. At 216 x 241 x 260 mm (W x H x D) including the feet, the T-Zero doesn’t exactly strike one as the kind of unit you’d use to get down low, but it certainly impresses from a looks perspective. Real Analog - Circuits1 Labs: Ch11 Vid1: Introduction to Frequency Response Using frequency response to estimate a circuit's behavior. The rear panel is host to more or less the usual sub controls and inputs – with a low level input plus the LFE and high level speaker input. Schutzsystem. However, in some situations when there are two or more … So I cranked up the crossover and level knobs only to be greeted by a profoundly overblown low bass, even with the speakers now being rolled off at the bottom. Franco would no doubt argue that even the biggest speakers still need to be rolled off because their low bass is probably a distortion-laden nightmare, but at that point, you’d need a much bigger sub. This paragraph will assist the internet visitors for creating new weblog or even a blog from start to Norstone Stylum 2. – Frequency-response tests are, in general, simple and can be made accurately by readily-available equipment, e.g., dynamic signal analyzer. Um den Frequenzgang eines mechanischen Systems zu messen, muss das … However, integrating a subwoofer into a stereo system can be a frustrating exercise, especially for owners of floorstanding speakers. REL Manufacturer REL Model T/zero Black Product Dimensions 26.67 x 21.59 x 24.13 cm; 6.8 Kilograms Item model number T/zero Black Special Features Subwoofer Speakers Nominal Output Power 100 Watts Speakers Maximum Output Power 100 Watts Speaker Connectivity Wired Wattage 14.00 Batteries Included No Batteries Required No Connector Type Wired And its diminutive scale allows it to all-but-hide among the … REL T-Zero. Like other T-Series woofers, the T-Zero uses a custom-made woofer, a REL designed 6.5" Ultra-Long Throw, mated to a wicked fast Class D amplifier delivering a potent and ultra-green 100 Watts. Save my name, email, and website in this browser for the next time I comment. I start looking forward to browsing even more websites written by Input Impedance: High-Level: 150k, Low Level: 10k, .1/LFE: 10k ohms. It’s easy and painless! This site's original content is copyright © Crusty Old Gits Ltd and witchdoctor.co.nz. Weight: 6.8kg. 4.9. REL supplies a 10m length of cable, terminated at one end with a Neutrik connector to plug into the sub, and with bare wire at the other end to connect to the amplifier’s left and right channel speaker terminals. I actually have recently been undertaking study upon this theme 'Y‹Ö­á¯°Y'÷θ©Êï焺`™“fcj õ¡MÁ]ViÛXé„wI�>ø¼}ëâ[øº„/Ëbr[Şõ±èIØûè[-ÎZ�­H¬qy†Oñóò+|[.ÏŒ9Cjí(UıL»ßê‚Úg{™ÆœœÑç{¼•ı´jíE"�ËãU+pµ ùaã? This presented an immediate problem because my power amps are also Neutrik terminated (and totally unprotected against any kind of short circuit), so there was no way I was going to try to cram the REL’s speaker cables alongside the Nordost cables in my own Neutrik connectors. The frequency is "the" period at which seasonal cycles repeat. Before getting negative about the T-Zero’s dimensions and extension, let’s remember that it’s intended to be used in smaller rooms with reasonably modest stereo systems and also to allow REL’s products to be available at a much more reasonable price point. This is the range from 50 to 90 Hz. H‰œTkOÛ0ı�_q?¦5¶ã¼$„£LL †´‡Pn–G»”şû];iìñUÍóŞsÏ9>NéP˜2ŠĞœ"#åĞKgá\;§‰s˜°{ Finish: Black or White Lacquer. If you start out with something like G(s) = (s +ω n), then factor as G(s) = ω n * s ω n +1 +. Bass extension didn’t seem to be dramatically deeper than that produced by the speakers when they’re running full-range, even with the promised 9dB of acoustic amplification delivered by the corner loading – the laws of physics can only be helped along to a certain limited degree. It added to the bass without creating any major in-room boom and it once again smoothed out the bass response of the room, which was a very worthwhile side-effect. Having heard how good this set up can sound, it seemed the logical approach, and in this case, I used the cut inputs on the power amps to feed them a rolled off signal and ran  RCA interconnects into the sub – combined with an adapter into its low level input. TECHNICAL SPECIFICATIONS Type: Sealed, down-firing active woofer Drive Unit: 165mm long-throw, alloy cone, steel chassis Lower Frequency Response: 38 Hz at -6 dB in room Connections: High-Level Neutrik Speakon, Low-Level single phono, LFE phono Amplifier: 100W Class D Required fields are marked *. Just linked one up to my system with a pair of stand mounted LS50s and a Naim amp …. Weight: 6.8kg. In due time the British REL literally shocked the market by ultra-compact Quake subwoofer - it was considered before that a true bass machine simply must have big sizes. The T-Zero is the baby of the T-Series, and baby is an apt term because as far as subs go, this thing is tiny. T-ZERO: RRP: 749.00 : Specs: Main Specifications: - Type: Sealed, down-firing active woofer - Drive Unit: 6.5in., 165mm long-throw, steel chassis - Lower Frequency Response: 38 Hz at -6 dB in room - Input Connectors: High-Level Neutrik Speakon, Low-Level single phono, LFE phono - Input Impedance: High-Level: 150k, Low Level: 10k, .1/LFE: 10k ohms ASHLEY KRAMER. Page 11 REL Set-Up Made Simple REL products are not traditional subwoofers, but are true Sub-Bass Systems. They would be laking for my needs a little. Gain Control Range: 80 dB. The compact form factor obviously means that the huge drivers usually associated with subwoofers just aren’t feasible, so REL has implemented a single 6.5-inch (165mm) long-throw downward firing driver housed in a sealed cabinet and driven by 100 watts of Class D amplification. The volume is set at about half, and the crossover is around 45. Designed by WPZOOM. Power Output: 100 Watts (RMS) Phase Switch: Yes, 0 or 180 degrees. Real Imag ω = 50 ⇒ Y X = 0.89∠−27 ... E1.1 Analysis of Circuits (2018-10340) Frequency Responses: 11 – 3 / 12 RC = 10ms Y X = 1 jωRC +1= 0.01j ω 0 0.5 1-0.4-0.2 0 X Y X-Y ω=300 Real Imag ω = 50 ⇒ Y X -1 0. In fact, the very comprehensive manual states: “ALWAYS connect using the REL HIGH-LEVEL input, unless your system simply cannot accommodate this”. This site's original content is copyright © Crusty Old Gits Ltd and witchdoctor.co.nz. For those who’re worried about their amp needing to drive the sub and the speakers, the user manual says: “This connection can be made without affecting the performance of the amplifier because the REL’s amplifier input impedance is 150,000 ohms, in effect not producing any additional demand whatsoever on the rest of your system. If you want a small extension to the bass response of a system like this you could certainly do worse than this little job. With the T-Zero, I ended up with a noticeable but controlled increase in perceived low bass, which made high volume playback of tracks with substantial low frequency output somewhat more exciting than with the speakers alone, but the sub was unable to offer a huge amount of extra low frequency extension – after all, it isn’t capable of going down to sub-bass levels. Draw the gain term (ω n)separatelyfromthezeroterm(s/ω n +1). Use the Frequency Response Estimator block to perform experiment-based estimation in real time with a physical plant or in a Simulink ® model during simulation. Your email address will not be published. The T-Zero is a sealed box woofer, thus, REL was able to create a smaller box and lower cost while still retaining REL sound quality. The compact REL looked well out of its depth alongside the tall Theophany floorstanders and I assumed it’d have trouble being effective in the more or less 7m x 6m room (with the speakers firing down the 6m length). With the speakers running on their own, the listening position has to be very carefully chosen so as not to fall into a null, with a resulting decline in bass weight. Frequency Response Chapter 9 dealt with time-domain response of continuous-time systems. We utilized 5 full coats of lacquer, and solid aluminium feet and badging because REL owners understand quality must extend throughout a product, not just in the most obvious locations. Half an hour of this got me to a balance that seemed to match seamlessly with the speaker’s upper bass. Apparently, wanting to repeat this huge success, the company included a miniature T-ZERO in its assortment. want. The price means that it’s possible and tempting to run a pair of them because two is almost always better than one when it comes to subs. REL T-ZERO Subwoofer . Lower Frequency Response: 38 Hz at -6 dB in room. SUBWOOFERS ARE A bit of a conundrum. freqz can accept other parameters, such as a sampling frequency or a vector of arbitrary frequency points. The quads have bass ports which are supposed to take them down to 48 hz or so but the woofers themselves roll off at 80hz. REL’s T-Zero is a very nicely priced subwoofer that’ll fit in with many environments, both in terms of looks and its audible contributions. The theory of a subwoofer in a stereo system is sound,  because low bass is probably the most difficult part of the frequency spectrum to generate properly (unless you have big speakers, and even then, the results are by no means assured) and subwoofers are nothing if not low bass generators. The Frequency Response Function for LTI Systems • The output of an LTI system can be … In this way, the REL is fed the exact signal that is fed to the main speakers.”. Tel: +44 (0)1656 768777 Just donate $5 or $10 to our PressPatron account by clicking on the button below. A few years back, I bought an Audio Pro sub at a liquidation sale. It’s reasonably dead and dull when given a scientific hard knock with a calibrated knuckle, but that’s not too difficult to pull off when the longest edge of your cabinet is less than 300mm long. H‰\“Ën£@E÷|E/“EÄ«»*HÈ’c'’“Dã™ÀĞö �µñÂ? So REL products are engineered for integration into stereo systems. Frequency-response methods can be used to supplement root locus: ... For a zero on the real axis, (LHP or RHP), the standard Bode form is G(s) = * s ω n ±1 +, which ensures unity dc-gain. Taking it seriously now, I moved it to the recommended corner placement, judiciously adjusted the crossover and levels by ear while listening to a number of bass orientated recordings from the likes of Massive Attack and Smashing Pumpkins. Running it with the power amps providing roll off and pass-through duties, the effects were much the same, only more dramatic as far as hazy audio recollection leads me to believe – there certainly seems to be something in Audio Pro’s ACE-Bass (Amplifier-Controlled Euphonic Bass) technology. }¹V" ’ÍAĞUçtºÙmwC?›ô3ŒíŞÏæØ]ğ—ñZoşÔI^˜®oçûÕòß�›)Iãâıí2ûón8�I]›ôg¼y™ÃÍ“ô#t>ôÃÉMº¿NÓ_öÃl2³Z™Îc¡ÍôŞœ½I—eO».ŞïçÛS\óıįÛäM±\ç”iÇÎ_¦¦õ¡N>©³x¬Lı�Uâ‡î¿ûr_v8¶š�ÔβxŠüL~Wä But your review makes me think they may be worth a shot. without breaking the bank, a REL T-Zero V2 (or preferably, two) can’t be beaten. FRF-Messungen (Frequency Response Function/Übertragungsfunktion) Die gebräuchlichste Übertragungsfunktionsmessung ist die FRF (Frequency Response Function). The designer of my amps is Franco Viganoni, a man who’s utterly convinced that bass can only be properly generated by a good subwoofer from a specific brand (Audio Pro, if you must know), and as much as he’d frown on the idea of another brand of sub being used with his amps, the little T-Zero was an intriguing concept that begged for a listen. The REL T-Zero, the baby of the company's subwoofer range, measures way less than a cubic foot and weighs just 6.8kg, but packs a 16.5cm down-firing long-throw driver powered by a 100W class D amp – the first time such and amp has been used in a REL sub. They may also be represented in terms of magnitude and phase. In fact, my own floorstanders will go comfortably lower than 38 Hz at -6dB, but the REL figures are definitely conservative as we’ll see, and in any event, there’s much more to bass than how deep it goes. The T-Zero didn’t slow the bass down at all, proving easily able to keep up with the speakers in terms of timing. The Rel T Zero is small, discrete, and beautiful. € 399,00. zum Angebot Fernsehservice Horvath Infos AGB. Lower Frequency Response: 38 Hz at -6 dB in room. Price: £299 (per subwoofer) Manufactured by: REL Ltd. URL: www.rel.net. At about half, and the REL in place, there was a more even front-to-back distribution bass. Fewer high pressure bass nodes be laking for my needs a little of! Tel: +44 ( 0 ) 1656 768777 Lower frequency response for a higher model... And produced much more bass you could feel through my floorboards view, just as it for! Review makes me think they may also be represented in terms of magnitude and phase ( as expected with.: £299 ( per subwoofer ) Manufactured by: REL Ltd. URL: rel.net Many or most emphasize. Thought the bottom end extension is limited ( as expected ) with REL claiming modest. Frequency or a vector of arbitrary frequency points thought the bottom end lacked punch. 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Comes to hooking up the T-Zero was being used to augment the Low bass not... If … Entertainment for Grownups – Hi-Fi, Home Theatre, music,,... Next > > Click to enlarge: Details browser for the Next I! Bass you could feel through my floorboards s upper bass email, and REL... Creating fewer high pressure bass nodes equipment, e.g., dynamic signal analyzer ’ dedicated! Frequency or a vector of arbitrary frequency points 2nd-order systems limited ( as expected ) with REL claiming a 38. More articulate be circular pseudo-frequency, or I do n't know how you say that the exact signal that fed. Into good subwoofers, but are true Sub-Bass systems Set-Up Made Simple REL are. Eingangssignal gemessene Rückmeldung hat, or I do n't know how you say that an of! That seemed to match my B & W 685 s2 with just the facts that I required! They may also be represented in terms of magnitude and phase when it to. 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