altec model 19....

[LICORNE]

I just put the common wire to all 4 lugs and connect it to the negative side of the speaker wire. I found out the clarity and HF/Mid range has great improvement. However, it doesn't help to improve the bass. Altec Model 19 is using 15" woofer. But you cannot notice any bass from the speaker. I wonder how we can help to improve the bass.

By increaing 3DB at 30 HZ should do the trick. If that does not work , Check to see if your woofers are connected right . They should be pushing. Check with 2.5 volt battery.

[aditya]

.......................Check to see if your woofers are connected right . They should be pushing. Check with 2.5 volt battery.............

I was under the impression that for proper bass the woofers ofcourse have to be in phase wrt each other, but not necessarily in the "pushing" mode only. It can be either way as we are dealing with AC voltage here.

This is an interesting point.

Thanks
Aditya

[GM]

.........but not necessarily in the "pushing" mode only.

?? When checking with a DC source to find electrical polarity (+ = a point source's diaphragm moves out), how does AC come into play?

There's the issue of correct horn polarity WRT the woofer though which is affected by both horn/woofer driver offset and XO slope order, so must be factored in along with the horn driver's mechanically reversed layout (diaphragm behind the VC).

GM

[unionville]

Thanks for your suggestion. I am using original crossover. How can I improve 3 db in 30Hz. Would appreciate, if you can elaborate a little more.

Unionville