MTL 138 a transmission line speaker as in Hobby Hifi 2/2008

MTL 138 aus Hobby HiFi 2/20MTL
Technical data:
- size (HxWxD): 950x172x300 mm
- impedance: 8 Ohm
- crossover frequency: 2 kHz
- sensitivity: 84 dB (2.83V/1m)
- frequency range (-3dB): 35-22 000 Hz
Clever Concepts (CC) 82 - Mivoc Transmission Line 138 (MTL 138 for short) gets by with low priced drivers: Mivoc HGH 258 FN-II and WPT 138.

Review in Hobby HiFi:
"In our editorial listening room the MTL 138 set a pace that took the jury's breath away: such an Úlan nobody had expected from this rather slim and low-priced design. Marla Glen's "The Cost Of Freedom" was reproduced with almost excessive verve, projected a rich and unbelievably low bass into the room and moulded the vocals realistically and authentically. Impressive was also the three-dimensionality. "Limehouse Blues", to be found on Proprius' "Jazz at the Pawnshop", revealed a meticulous staggering of instruments, with clearly differentiated width and depth and lots of air in between. Even at low volumes this speaker resolves the finest details effortlessly and allows us to listen to music in a relaxed way without having the constant urge to raise the level. But then, this transmission line speaker is relaxed even at higher volumes. The MTL fills even larger rooms with ease, while obviously speakers with a considerably larger piston radiating area have the advantage." ...
 

Our kit contains:

- the Mivoc HGH258 FN-II dome tweeter
- the Mivoc WPT138 bass / midrange driver
- 1.5 bags damping material
- 1 HP50 bass reflex tube
- a reasonably priced terminal
- 2.5 metres cable 2 x 1.5 mm2
- 8 screws Pan 4 x 20
- the building instruction
- the crossover components be mounted on wood:
- 1.8 mH air core coil / 1 mm wire
- 15 μF audio frequency ELCO
- 3.3 μF MKP foil capacitor
- 6.8 Ohm MOX4 resistor (blue-grey-gold)
- 4.7 Ohm MOX4 resistor (yellow-purple-gold)

Unlike the Hobby HiFi version, we have added a MKP capacitor in the signal path to the tweeter. The sound improves considerably and the additional cost is negligible.

Note: Only with black tweeter available.

Price per speaker without cabinet - not available

Upon request a 150 x 115 mm sized universal PCB is availalble to mount the components.
Price of PCB (1 is needed per speaker) EUR 4,70 excl. VAT: € 3.95 / $ 4.54

MTL 138 with high-end crossover and terminal with adjustable high frequencies

If you prefer a crossover of higher quality for the MTL 138 we recommend the following kit with high-end components. Our high end kit comes with higher quality components and a Mivoc terminal that allows adjustment of high frequencies. Therefore, more resistors are supplied:

- 1.8 mH air core coil / 1.4 mm Draht
- 15 μF ELCO, non-etched
- 3.3 μF Mundorf MKP foil capacitor
- 4.7 Ohm MOX4 resistor (yellow-purple-gold)
- 10 Ohm MOX4 resistor (brown-black-black)
- 12 Ohm MOX4 resistor (brown-red-black)
22 Ohm MOX4 resistor (red-red-black)

Price per speaker without cabinet - not available

Upon request a 150 x 115 mm sized universal PCBis availalble to mount the components.
Price of PCB (1 is needed per speaker) EUR 4,70 excl. VAT: € 3.95 / $ 4.54

Impedance correction for valve amps

For valve amps we supply an impedance correction. Since here the quality of the components doesn't influence the sound we offer only one version. (Upon request a high-end version is nevertheless supplied)
- the impedance correction, to be mounted on wood, contains:
- 0.22 mH air core coil / 0.7 mm
- 22 μF ELCO, etched
- resistor 10 Ohm, 10 Watt

Price per speaker: EUR 9,20 excl. VAT: € 7.73 / $ 8.89

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