Nagaoka Tetsuo Designed BS-10 Fostex & Koizumi Wireless Collaboration FK10P Equipped
69.30 USD(tax included)
／124.74 USD (Excluding tax)
Sales unit: 1 piece
Application number: / Manufacturer: / Model number: m90197168295 / JAN code: / AS ONE / NAVIS Product number:
| Application number | |
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| Manufacturer | |
| Model number | m90197168295 |
| JAN code | |
| Sales unit | 1 piece |
| Price | 69.30 USD (tax included) / 124.74 USD (Excluding tax) |
*Additional shipping fees will be charged for this product in Okinawa Prefecture, remote islands, some other areas, and mountain areas. Please note that we may not be able to deliver depending on the region. If we are unable to deliver your order after placing your order, Askul will contact you.
Please note the following points as this item is directly shipped.
- Additional shipping fees will be charged for this product in Okinawa Prefecture, remote islands, some other areas, and mountain areas. Please note that we may not be able to deliver depending on the region. If we are unable to deliver your order after placing your order, Askul will contact you.
- This product may not come with a delivery note issued by Askul. Customers who wish to receive a delivery note issued by Askul can print it out as a PDF file from the usage history on this site after receiving the product.
- It is not delivered in Askul cardboard or a bag.
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- If it becomes clear after placing your order that the item is temporarily out of stock, it will be delivered as soon as it becomes available.
This image is a representative image. Please check the specifications for details.
Stock: Slightly
Direct delivery product
Shipping charges for products from this shipping source will be borne by us.
58 USD (tax included)
/ 63.8 USD (Excluding tax)
Product details
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| Product features | Category Speaker Woofer Condition No noticeable scratches or marks Shipping Included in price (by seller) From Tokyo |
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| Manufacturer name | - | Brand name | - |
| remarks | [About returns] We cannot accept returns due to customer's convenience. | ||
| Product details |
Width: 186 mm, Height: 260 mm, Depth: 190 mm Approx. weight: 2.2 kg Set of 2 units These are bass-reflex speakers designed by Tetsuo Nagaoka, model BS-10 (L-shaped folded slot), featuring the 10cm full-range FK10P unit, a limited production of 500 pairs co-developed by Fostex and Koizumi Musen. They were featured in the Music Friend Publishing's Audio DIY as a weekly magazine-sized bass-reflex speaker. Published in 1975 (Showa 50). At the time, there was no model number, but this is an early design by Mr. Nagaoka that later gained a solid reputation. As shown in photos (4, 5), the front, top, and back panels of this unit are 15mm thick. The side panels are 18mm thick, and the bottom panel is 21mm thick, all made of birch plywood. The finish is three coats of Turner water-based milk paint (Snow White) applied with a roller (photo 11). The white parts of the mounted unit are the sub-cone paper (photos 7, 8), making it a double-cone design. The opening size on the front baffle is 93mm. The diagonal mounting size for the unit is 116mm, with M4 T-nuts installed. This size can accommodate many 10cm full-range units as is. FK10P Specifications (quoted from datasheet) Lowest resonant frequency: 74Hz Impedance: 8Ω Playback frequency range: 74Hz - 35kHz Output sound pressure level: 86dB Input: 36W Moving mass (mo): 3.7g Effective radius of vibration (re): 4cm Magnet weight: 271g Total weight: 645g Baffle opening: 93mm *Unused, stored item Comparative Listening Impressions (personal opinion) (photo 12) 1. My own build using Fostex FE103En, conforming to the manufacturer's standard bass-reflex design. The 103 has high efficiency and a sense of sound diffusion. I had high hopes for this unit's high frequencies up to 35kHz, but it was just okay. Overall, the 103 sounds lively and boisterous, while this unit exudes a calm atmosphere. It's a matter of personal preference which you prefer. 2. Double bass-reflex speaker using the German Visaton 10cm full-range FR10 unit. It has beautiful high frequencies, but perhaps due to insufficient aging, the sound is stiff and the bass is lacking. This unit is superior. Please understand that this is a homemade item by an amateur. There may be imperfections in the craftsmanship, scratches from the manufacturing process, and unevenness in the paint. Please judge based on the photos. The cones will be protected with bubble wrap and shipped in a used cardboard box. Click here for the manufacturer's site 
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