ANATECH Loudspeaker, LS-1.
 
 
- Excellent amplitude and phase response
- Superb inter driver integration
- High efficiency
- Adaptable to different room acoustics
- Carefully tailored dispersion
- Finest furniture finish in Cherry with solid Walnut edge insertions
 
The loudspeaker is a two-way system utilizing an 8" midwoofer and a 1" tweeter.
The woofer has a hand coated short fiber lightweight pulp membrane with a dust cup in a very thin mineral filled polypropylene, fitted to the membrane with a high damping PVA adhesive. The motor system has a T-shaped pole piece for maximum flux linearity and ventilation through the bobbin. The very light surround is carefully damped by a coating on the inner rim. The driver uses an injection molded magnesium chassis.
The tweeter has a membrane in dry coated synthetic silk (is not hygroscopic as natural silk) for maximum environmental stability. The driver is ventilated through the bobbin and is damped and cooled by a light ferrofluid in the magnetic gap. The organic fiber acoustic damping behind the dome membrane totally absorbs the back wave, yielding a response virtually free of interference from internal reflections.
The crossover filter uses only the finest components, such as high voltage super linear polypropylene capacitors, air winded inductors in oxygen free copper (OFC) and resistors with adequate power capacity and temperature stability. All internal wiring is done by cables using silver clad OFC strands and polypropylene insulation.
The speaker cabinet is built in 25, 19 and 10 mm MDF-board. It has supporting inner walls between all outer walls. The backside of the cabinet houses the integrated rectangular ultra low compression and wind noise free reflex port. Precision cut foamed polyether is used for all internal damping.
 
Specifications
 
Frequency response : 32 - 19 000 Hz (in room response typically better than 28 - 23 000 Hz , - 6 dB).
     
Band limitation
characteristics
:
HP (bass) = 4th order low-Q under tuned response (renders a beautifully deep and articulated bass without loosing a naturally rich tonal quality). LP (treble) = 5th order linear phase Bessel response (gives superb control and an extraordinarily airy top end, absolutely free from ringing).
     
Linearity within pass band : Better than +/- 2 dB.
     
Phase response :
Phase response is within +/- 55 degrees from 0,1 - 6 kHz. (The system exhibits minimum phase characteristics from 0 - 34 kHz except for a second order allpass function centered around 3,8 kHz).
     
Tonal adjustments :
The speaker can be strapped in four different ways on the back panel. The range above 4,5 kHz can be lowered 2 dB by removing a strap. The range between 300 Hz and 2 kHz can be emphasized 2 dB by adding a strap. The former action is suitable when the speaker is used in acoustically very "edgy" rooms. The latter is preferred when clarity is lacking, usually in large lively rooms. Standard strapping is; right strap (highs) on, left strap (mids) off. The linearity claims are valid with all four strapping combinations except when midrange is emphasized and high range is damped. (The loudspeaker crossover filter can also be equipped for professional monitor use. When so there is an extra switch on the back panel, adding energy in the 2 - 4,5 kHz range when activated. In this monitor mode, the speaker should be used only in acoustically treated studio environments, where it will exhibit a response typically within +/- 1 dB).
     
Nominal impedance : 5,5 ohms (min 4 ohms @ 33 & 220 Hz).
     
Sensitivity : 92 dB @ 2,83 volt, 1 meter.
     
Directional index :
At 15 degrees horizontally the sensitivity is about 1 dB down above 150 Hz. At 45 degrees it is 4 dB down. This makes the speaker ideally suitable for room sizes between 12 and 60 m2
(130 - 650 sq. ft).
     
Dispersion quality :
Within a 30 degree window (i.e. +/- 15 degrees horizontally) there is less than 1 dB deviation from listening axis response 0 - 14 kHz directional index deducted. At +/- 45 degrees the deviation is less than 2,5 dB (up to 10 kHz).
     
Crossover :
3 050 Hz, modified acoustic L - R. LP = acoustic Bessel-approximation (- 6 dB @ Fcr). HP = pole-separated 4:th order acoustic response (- 6 dB @ Fcr).The phase integration between the drivers is exceptional, giving lobe losses within the entire audible range of less than 0,3 dB. The Outputs from both drivers are added constructively from 0 Hz and up to more than one octave above Fcr.
     
Long time maximum power
(IEC 268 - 5)
: > 80 W.
     
Max dynamic power : 400 W.
     
Voltage needed to use the full linear dynamic capacity of the speaker in the low frequency range :
10 volt RMS (12,5 W in 8 ohms, 25 W in 4 ohms), which will generate 104 dB in listening position (3 meters) from two loudspeakers in an ordinary room. The speaker can actually be driven to impressive dynamic levels with as little as a couple of volts RMS.
     
Recommended amplifier size (Watts / Volts)
Calculated in 8 ohms
Calculated in 4 ohms
:
:
2 - 100 W (4 - 28 volts RMS).
4 - 200 W (4 - 28 volts RMS).
     
Optimum drive impedance :
0,2 ohms (driven within the interval 0,1 - 0,3 ohms, the frequency response will change less than +/- 0,2 dB).
     
Dimensions : 30 x 51 x 45 cm (width x height x depth).
     
Weight : 20 kg each.
     
Finish :
Cherry veneer with details in solid walnut. Black absorbing felt on tweeter part of front baffle.