This enables you to choose from two Top versions, either containing the airy
Air Motion Transformer ER4 or a dome tweeter for high frequencies. It also
up to you whether you prefer to use the small shelf speaker on its own or
in conjunction with an additional Sub part (containing the Eton 8-800/37 hex).
The first two versions come with a small bass reflex cabinet. The last two
versions contain an additional subwoofer; then the Top part is a closed cabinet
for improved impulse response.