This project was built by following the guide from MA.
- By trial and error we ended up tweaking a little bit the final design of the electronics.
- Paper in Oil caps were used.
- The box was dampened with Alu-butyl and wool.
- Black shiny finish 🙂
Here is the guide that was used:
Markaudio LS90-MP – Sealed box bookshelf
homage to BBC LS3/5a for CHR-90 & CHP-90 5in fullrange
- Designed to reference BBC LS3/5a dimensions
- 12mm thin-wall side, top, base & rear baffles with 18mm front baffle to accept driver basket with enhanced stability
- Chamfer driver cutout to reduce reflections & improve airflow
- All internal panels apart from front baffle lined 2mm – 2.5mm car body damping sheet / bitumen acoustic damping mat. If self-adhesive, recommend using own glue to reduce chance of delamination at future date
- Top, rear & base lined over car body / bitumen damping with 25mm – 30mm bonded acoustic fibreglass board, wool felt, BAF wadding or equivalent.
- Side panels lined 12mm – 15mm bonded acoustic fibreglass board, wool felt, BAF wadding or equivlanet.
- 12mm void-free multiply recommended for main box. Front baffle may be void-free multiply or HDF
- CHR-90 or CHP-90 may be used to preference, with small change in system Qtc.
Crossover components:
- C1 = 10uF MKP
- L1 = 1.8m 14ga air core
- R1 = 6.80hm – 100hm 10w. Adjust value to adapt
- midband voicing to taste
Please see dimensions in the pictures.
If you read till here, there are a few videos available with the in-dept build quality.
Build Quality & paint finish – this video was made during the last testing. notice the screws.
Random song 1, Random song 2, Random song 3
I hope you enjoyed it. Feel free to comment
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