Mission 731i

Mission 731i speakers
Speakers for a lepai/lvpin amp see first post here LINK i found some mission 731i speakers from gumtree for a few pounds. They were in great condition (complete with grills) and with reassuringly well braced and heavy cabinets.
The 731i’s are from the mid 90’s and are 8ohm, 89db, and they were as the specs indicate very easy to drive when hooked up to my main amp. When i paired them with the T amp, that really needs easy to drive speakers due to the low power output it sounded great.

job done.

Spec:

Frequency Response ±3dB: 70Hz – 20KHz
LF Response -6dB: 55Hz
Nominal Impedance: 8Ohms
Sensitivity SPL 1M 1.83V: 89dB
Recommended Amplifier: 25 – 75 W/C
Max SPL per Pair: 103dB
Crossover Frequency: 3.1KHz
Drive Units: 130mm Plastiflex (LF); 2.5mm Silk Dome F. F Cooled (HF)
Input Connector: Multi Way Post
Cabinet Dimensions: 313mm h; 175mm w; 200mm d
Finish: Black Ash

Wooden speaker brackets from 2×4″ and 2×3″

I wanted to make some speaker brackets for the new (old) mission speakers I acquired for the workshop and having some scrap 2×4″, 2×3″ and MDF, I made up these.

I was inspired by this design from instructables LINK. I choose to amend the design by choosing to use lots of wood glue(!) and mitred some of the edges for aesthetics.

I cut the pieces to size, sanded and fixed with wood screws and lots of wood glue. These will easily support the speakers and I think look good. By cutting the 2×3″ this way it will ensure that there is plenty of room to fix the brackets to the wall either side of the brace. I used two fixings at the top and one fixing at the bottom. This seems to be holding them very securely.

Parts cut

Job done.

Workshop Sounds – Lepai Amplifier

Lepai/Lvpin Tripath Amplifer

I had been looking for an amplifier for the workshop for a while and read about these small and cheap amplifiers on the DIYAudio forum [link to diy audio posts]. The posts suggested that although cheaply made the amps sound great and are very easy to mod.  So order placed and £19.99 later it arrived. My new version can badged as Lvpin, the new name for Lepai (apparently meaning “dependable product” in Mandarin”). I ordered one without a PSU, I happened to have an external hard drive PSU offering 12v DC 2 Amps output so I hooked that up first to check how this budget amp would fare.

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