manjaro　linux で　usb bluetooth を使って　真空管アンプを利用



![Photo Marker_20210911_080710.jpg](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/211097/6b0fb3fc-ea18-0760-ebd3-c23b8db8dcee.jpeg)


##　ブルーツース　5.0 です

![1.jpg](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/211097/765d3d00-3aa6-e7be-95e2-207877a5c0b8.jpeg)

## 使ってるには　NEC Express5800 です。


|https://www.kit-ya.jp/etc/column/41　の一部|
|:---|
|　使いこなしに関して言えば、前回述べたツィーターも今回のテーマであるサブウーハーも"レベルを上げ過ぎない"ことが極めて重要です。
|特にサブウーハーのレベル調整はツィーター以上にシビアで、逆説的な表現になりますが
|"鳴っていないように鳴らす"ことが主スピーカーの個性を活かしつつ再生レンジを広げる為の最も有効な手段となります。


## お釈迦は瞑想（実は全集中なのです）のレベルは
##　すぐ近くに雷が落ちても
##　それに全く気づかなかった位です

我々も試合中には　周りの音がきこえないですよね
ただ　集中の深さと　持続時間が　まったく違います


diiff をとると

```
 diff db d0
1182,1215d1181
< [15983.239680] usb 3-2: new full-speed USB device number 21 using xhci_hcd
< [15983.380847] usb 3-2: New USB device found, idVendor=0bda, idProduct=8771, bcdDevice= 2.00
< [15983.380854] usb 3-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
< [15983.380858] usb 3-2: Product: Bluetooth Radio
< [15983.380861] usb 3-2: Manufacturer: Realtek
< [15983.380863] usb 3-2: SerialNumber: 00E04C239987
< [15984.049250] Bluetooth: Core ver 2.22
< [15984.049283] NET: Registered protocol family 31
< [15984.049284] Bluetooth: HCI device and connection manager initialized
< [15984.049289] Bluetooth: HCI socket layer initialized
< [15984.049291] Bluetooth: L2CAP socket layer initialized
< [15984.049294] Bluetooth: SCO socket layer initialized
< [15984.076509] usbcore: registered new interface driver btusb
< [15984.090132] Bluetooth: hci0: RTL: examining hci_ver=0a hci_rev=000b lmp_ver=0a lmp_subver=8761
< [15984.091137] Bluetooth: hci0: RTL: rom_version status=0 version=1
< [15984.091139] Bluetooth: hci0: RTL: loading rtl_bt/rtl8761b_fw.bin
< [15984.104936] audit: type=1130 audit(1631310124.205:131): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=systemd-rfkill comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
< [15984.108361] Bluetooth: hci0: RTL: loading rtl_bt/rtl8761b_config.bin
< [15984.111754] Bluetooth: hci0: RTL: cfg_sz 25, total sz 21389
< [15984.150851] audit: type=1130 audit(1631310124.252:132): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=bluetooth comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
< [15984.169868] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
< [15984.169870] Bluetooth: BNEP filters: protocol multicast
< [15984.169874] Bluetooth: BNEP socket layer initialized
< [15984.174078] audit: type=1334 audit(1631310124.275:133): prog-id=22 op=LOAD
< [15984.174756] audit: type=1334 audit(1631310124.275:134): prog-id=23 op=LOAD
< [15984.174759] audit: type=1334 audit(1631310124.275:135): prog-id=24 op=LOAD
< [15984.209681] audit: type=1130 audit(1631310124.309:136): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=systemd-hostnamed comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
< [15984.229135] Bluetooth: hci0: RTL: fw version 0x0d99646b
< [15984.307805] NET: Registered protocol family 38
< [15984.357377] Bluetooth: RFCOMM TTY layer initialized
< [15984.357383] Bluetooth: RFCOMM socket layer initialized
< [15984.357388] Bluetooth: RFCOMM ver 1.11
< [15985.317479] audit: type=1130 audit(1631310125.419:137): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=blueman-mechanism comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
< [15989.109586] audit: type=1131 audit(1631310129.209:138): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=systemd-rfkill comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'

```


```
# lsusb
Bus 002 Device 002: ID 8087:8000 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:8008 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 004: ID 046b:ff10 American Megatrends, Inc. Virtual Keyboard and Mouse
Bus 003 Device 011: ID 13ba:0018 PCPlay Barcode PCP-BCG4209
Bus 003 Device 010: ID 03f0:2514 HP, Inc 4-port hub
Bus 003 Device 021: ID 0bda:8771 Realtek Semiconductor Corp. Bluetooth Radio
Bus 003 Device 002: ID 148f:5370 Ralink Technology, Corp. RT5370 Wireless Adapter
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

```



以下のように　真空管アンプが認識されてます
![1.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/211097/69e8d1ed-908b-f9f9-1431-635ea0d116ab.png)