This is the now discontinued Ashdown Superfly 500w bass head. 
Here be specifications: 
 
[b]Power Output (RMS)[/b] 2 x 250W into 4 Ohms 
[b]Line Input[/b] 100mV – 5V 
[b]Line Output[/b] 10K Ohms, 0dB 
[b]DI Output[/b] 600 Ohms balanced / Level -20dBu nominal 
[b]EQ[/b] +/- 15dB at 60Hz, 180Hz, 340Hz, 660Hz, 1.3kHz, 2.6kHz, 5kHz 
[b]HxWxD (mm)[/b] 220 x 86 x 360 
[b]Weight (kg)[/b] 4.5 
[b]Effects Loop[/b] 10K Ohms, 0dB 
[b]Digital Interfaces[/b] USB, MIDI 
[b]Programme Memories[/b] 30 Factory, 69 User	 
 
[url="http://www.ashdownmusic.com/bass/detail.asp?ID=156"]http://www.ashdownmusic.com/bass/detail.asp?ID=156[/url] 
 
As you can see in the picture, mine doesn't have the plates. I removed them because they alone weighed about 3kg, and the amp gets pretty hot. 
The reason i'm selling it is because I don't really need an amp at the moment, and would prefer to get a Cafe Walter headphone amp or something for practice. 
I quite like the tone of the amp. It sounds pretty nice flat, and i've never really felt the need to mess about with the EQ.  
 
Pics: 
 
 
 
 
Sold as seen in picture with a power cable (and packaged, obviously) 
If you're particular about wanting the plates etc I can dig around for them but I can't promise i'll find them. 
With them on delivery will also cost more. 
 
 
Selling it for £180 ono 
I'd imagine delivery would be about £15. 
Paypal is fine. 
PM me with any questions.