KH Klein Hummel O 300 Nearfield Reference Monitor 3 Amplifier Speaker (One unit)
- Condition: Used
- Price: 473.33 EUR
- Status: sold
- Item number: 167061106192
- Seller: cashhifi (2087|99.4%)
- Seller information: Commercial (with base shop)
- Item location: Simi Valley, California
- Ships to: US
- Shipping: 150,0 EUR
- on EBAY
-
Description
KH Klein Hummel O 300 High Res Nearfield Reference Monitor 3 Amplifier Speaker Sale is for one speaker and you MUST purchase two and I will send you one Left and one Right Price of shipping is correct and we split the price between item price and shipping to make it available for purchase internationally Designed In Germany Made In Ireland Used, Working Perfectly, Drivers are in perfect condition, Cabinets may have some signs of cosmetic wear Original mounting side knobs and rear brackets are included you will receive with one of the knobs in the picture Power cord included Incredible speakers, image and balance of the sound it's really impressive The O 300D is a surprisingly small active three-way nearfield monitor, clearly intended for use on the meterbridge of a large-format studio console. It measures 253 x 383 x 290mm (hwd), 9.96 x 15 x 11.4 weighs in at 13.5kg, 30lbs and features full magnetic shielding, so placement near moving-coil meters and computer VDUs is not a problem. The sealed (infinite-baffle) cabinet is constructed very solidly from MDF finished in a charcoal-grey enamel as standard, although there is also a flock-finished version (recommended if the speakers are likely to be moved a lot), and various other special finishes are available to order. There are also various built-in options and kits for mounting the monitors in various ways if the console meterbridge is not appropriate. Each cabinet has an 8mm threaded socket on each side to which various optional mounting adaptors and brackets can be fitted. There are also heavy-duty brackets with quarter-inch holes fitted at the rear of the speaker for wall or ceiling mounting. As standard the monitors are not supplied with any kind of protective front grille, although a fine wire-mesh grille is available as an option, if required. The driver complement comprises a 210mm (eight-inch) polypropylene-cone woofer, a 76mm [three-inch] soft-dome mid-range unit, and a 25mm [one-inch] titanium-dome tweeter. The tweeter is mounted above the mid-range unit — both being the same components as used in the company's larger O 500C monitor — and the pair are located beside the woofer, which occupies the remaining baffle space. The red K+H badge below the woofer illuminates when mains power is applied, and flashes if any of the amplifiers clip or if the protection limiters are triggered. K+H prefer to use a three-way format even in modestly sized speakers like the O 300D because of the numerous performance advantages it affords — even though there is a corresponding cost penalty. Sharing the frequency range across three drivers reduces the demands on each individually, permitting much better control and accuracy. The bass driver no longer has to generate mid-range frequencies, avoiding problems with resonances, breakup modes, and harmonics, as well as reducing the problem of standing waves in the cabinet and Doppler distortions (mid-range frequencies being modulated by LF signals using the same cone). The mid-range and tweeter domes are housed in their own sealed enclosures and thus are completely independent of the woofer and the acoustic energy contained within the main cabinet. The front baffle is made from a material referred to as 'Low Resonance Integral Moulding' or LRIM, and this can be machined to produce complex three-dimensional shapes such as the waveguides used for both the tweeter and mid-range drivers. These waveguides help control dispersion, as well as allowing the two drive units to be mounted in the correct vertical plane for accurate time alignment. An elliptically shaped waveguide is used for the tweeter to provide wider horizontal dispersion than vertical, and a modest horn shape is used for the mid-range dome. The narrower vertical dispersion is intended to minimise HF reflections from the console surface, which would otherwise cause detrimental comb-filtering effects. The wider horizontal dispersion ensures a large 'sweet spot', making it easier to hear the spatial imaging over a wider proportion of the console. The O 300D monitors are 'handed', meaning that they are available as left- and right-hand models — K+H recommend placing the speakers with the tweeters on the outside edges when the speakers are used as a stereo pair. However, there is no dedicated centre version, and in 5.1 surround systems either a left- or right-hand monitor can be used for the centre channel. In this application it should be set up vertically, with the tweeter and mid-range driver at the top. For the LFE channel, one or two O 800 subwoofers should be used. The amplifier chassis at the rear of the monitor incorporates three discrete MOSFET power amplifiers providing 150W RMS (250W peak) for the woofer and 65W RMS each for the mid-range unit and tweeter. The mid-range amp can manage 75W peaks, while the tweeter amp can produce 110W peaks. Each amplifier channel has built-in protection limiters. The peak SPL measured at one metre is quoted as 112.8dB (for three percent distortion), although at more realistic listening levels (95dBSPL) the distortion is specified as being below 0.5 percent for all frequencies above 100Hz. The overall frequency response is given as 40Hz-20kHz (±2dB) and the supplied traces are remarkably flat. The crossover points are set at 650Hz and 3.3kHz, both with fourth-order (24dB/octave) slopes. There is also a protective subsonic filter which rolls off at 6dB/octave below 30Hz. here are two audio inputs available: analogue and digital. The Lundahl transformer-balanced (and floating) line-level analogue input is connected via an XLR socket and has a nominal sensitivity of +6dBu — although there is also an input attenuator which ranges from zero to -24dB to accommodate higher levels. Digital signals can be connected in either the conventional AES3 format via the same XLR socket used for the analogue input, or via a BNC socket in either AES3id (unbalanced) or S/PDIF formats. The balanced AES signal is routed through a transformer, the secondary of which is wired in parallel with the BNC socket. This enables the latter to be used as a loop-through if required (to convey the stereo digital input signal on to the other stereo speaker, for example), or to connect a 75? termination either directly or via a BNC 'T' piece, as appropriate. The handbook provides comprehensive instructions about how to correctly connect inputs of various formats. A screwdriver-operated rotary switch selects the type of input signal in use: analogue, left digital channel, right digital channel, or a mono sum of both left and right digital channels. The digital input is handled with a 24-bit delta-sigma converter that can accept any standard sample rate between 32kHz and 96kHz. As with most active monitors, the O 300D features a range of room-correction equalisation facilities, all adjusted through recessed screwdriver-operated controls. The bottom end can be tamed to compensate for placement in free space, near a wall, in a corner, or in a corner near the ceiling — each successive setting introducing 3dB more attenuation to the woofer's output. There is also a mid-range equaliser which attenuates a broad band of frequencies extending from about 50Hz up to 1kHz to compensate for reflections from a console when mounted on the meterbridge. The options provide from zero to 6dB of attenuation in 2dB steps. Finally, there is a high-frequency level control to accommodate the variabilities of control-room HF absorption and reflection. This provides level trim from +1dB to -2dB in 1dB steps, and it affects frequencies from about 2kHz upwards. The handbook provides a complete set of traces and measurements for the O 300D, which appear very impressive. One plot is of the system group delay, and this is interesting because it shows negligible delay for any frequency above about 100Hz, and only a gently rising delay below that to about 10ms at 50Hz. This is linked to the use of a sealed enclosure, and results in a very tight and fast bass response with good transient accuracy. Other rear-panel facilities include a ground-lift switch to separate signal and chassis grounds, a mains rocker switch, and an IEC mains inlet socket. One particularly interesting feature is a seven-pin XLR socket and its associated slide switch. The socket provides direct inputs to each of the three power amplifiers, bypassing all of the internal input handling, crossover, and protection circuitry (apart from a peak limiter for the bass amp). The slide switch disables this internal circuitry and enables the external three-channel discrete inputs, the aim being to drive the monitors from the optional Pro C28 digital controller unit. This unit provides input-signal handling, digital conversion, crossover, sophisticated room equalisation, and protection limiters, all performed in the digital domain with high-resolution processing — see the 'Pro C28 Digital Controller' box for more details. WE ARE LOCATED IN SIMI VALLEY CALIFORNIA. PLESE CHECK MY STORE FOR OTHR ITEMS PLESE SEE PHOTOS FOR ALL THE DETAILS. ALL ITEMS ARE TESTED BEFORE LISTING AND BEFORE SHIPPING. All listings can be canceled without any notice We use some other sites ( Facebook/Craigslist /OfferUp/Audio-Mart) for selling to local and international customers If item is used, it has been used previously. The item may have some signs of cosmetic wear, but is fully operational and functions as intended. CHECK MY FEEDBACK AND BUY WITH CONFIDENCE. POLICY: RETURN ALL SALES ARE FINAL PLEASE MAKE SURE YOU ARE BUYING THE RIGHT ITEM FOR THE RIGHT REASON NO RETURN ON ALL SALES, IF WE EXEPT ANY RETURN REQUEST FOR ANY WRONG PURCHASE IT WILL BE PARTUL REFUND UP TO 50% SHIPPING COSTS ARE NOT REFUNDABLE We ask all buyers to email us before REQUESTING ANY RETURN or opening a EBAY CLAIM CASE We ask all the buyers before leaving a negative or neutral, please email us with the problem first and we will do our best to solve it for you. We care about our buyers and we only want to see them happy. WE WANT TO SEE ALL OUR BUYERS SATISFIED Shipping Shippings are via FedEx, UPS or USPS ground Shipping will start In same or two days depending on your item. Shipping rate is for USA continental ONLY and is rated to all 48 state, please do not ask for the lower shipping rate. Local pick and inspection is free and can be CASH NO TAX when you do pick up. Shipping address must match eBay profile and CAN NOT be changed ALASKA AND HAWAII BUYERS must ask for the shipping rate before purchase. Thank you CASHHIFI
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