Create wifi subnet with a user-supplied SSID on an iMAC?

This all for an iMac running OS X 10.4.9

I have a wifi network with SSID "NETGEAR", 192.168.0/24, used to
connect to the 'Net.

When drunk last week I ordered a wireless SB3 to use to stream music
from my iMac to my HiFi. Much better than swapping CDs.

I don't want to use my "NETGEAR" network for this to improve security
and reduce bandwidth contention. Also, so that I don't depend on the
NETGEAR device for this all to work.

So, with a little help from this group I created another alias on en1,
set up with the manual IP 10.0.1.1/16, router entry left empty. Below,
192.168.1.7 is the SB3.

netstat -nr
Routing tables

Internet:
Destination Gateway Flags Refs Use Netif
Expire
default 192.168.1.1 UGSc 26 7 en1
10/16 link#5 UCS 0 0 en1
10.0.1.1 127.0.0.1 UHS 0 0 lo0
127 127.0.0.1 UCS 0 0 lo0
127.0.0.1 127.0.0.1 UH 15 4813 lo0
169.254 link#5 UCS 0 0 en1
192.168.1 link#5 UCS 6 0 en1
192.168.1.1 0:18:4d:52:a1:76 UHLW 4 29 en1
1184
192.168.1.7 0:4:20:7:1c:79 UHLW 1 15 en1
1185
192.168.1.8 127.0.0.1 UHS 0 6 lo0

However, at no point have I had the opportunity to create a SSID of my
own. Is it possible to do this?

Some system info because it might be relevant, and because I think the
system_profiler command is cool.

system_profiler -detailLevel mini SPHardwareDataType
Hardware:

Hardware Overview:

Machine Name: iMac
Machine Model: iMac5,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.16 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache (per processor): 4 MB
Memory: 1 GB
Bus Speed: 667 MHz
Boot ROM Version: IM51.0090.B03
SMC Version: 1.9f4

/usr/sbin/system_profiler SPAirPortDataType
AirPort Card:

AirPort Card Information:

Wireless Card Type: AirPort Extreme (0x14E4, 0x87)
Wireless Card Locale: Worldwide
Wireless Card Firmware Version: Broadcom BCM43xx 1.0 (4.80.79.1)
Current Wireless Network: NETGEAR
Wireless Channel: 6

TIA,
Adam.

.

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