Can cheap strings create dead spots?

[RikBass]

I have a Martin acoustic bass fitted with cheap acoustic strings.
The problem is that when i amplify the bass the 7th fret E on the A string sounds dead.
It seems to sound ok when not amplified.
Could it be my pickup ( a Seymour Duncan Woody Soundhole pickup) or the strings or maybe just my bass?
Has anyone encountered a similar problem?
Any advice will be much appreciated.
Thanks.

[rmrf]

Usually, when your strings die, you start to hear all hidden dead spots. In my practice cheap strings like "Musician Choice" from GC dies in 1-2 weeks, D'Addario in a month-two, DR Hi-Beams - 4 months and still sounds good.

Get good strings and you'll save a lot of money and of course you'll get a great sound

[RikBass]

Thanks for your advice.
I have picked up a set of extended life D'addarios and will change them and see how i go.
cheers and thanks again.
rock on!