Try m+p international www.mpina.com or www.mpiuk.co.uk they have a very good package which is part of their SmartOffice software, the Modal package is availalble on its own.
Another option is the SmartOffice system from m+p international, portable or lab based analysis anything from 4 to unlimited channels, we use one and it has the most effective analysis and reporting software available.
try www.mpiuk.co.uk or www.mpina.com depends where you are
I use the latest software from m+p international, SmartOffice has a complete modal analysis module which has the benefit of working with loads of different data types.
Great flexibility, always done the job, we have an 8 channel portable acquisition system.
Have to agree with Blackeye,
Try m+p, they are the current leaders, they can use different types of hardware so the entry level systems are cheaper but still with high spec. Well ahead of Data Physics these days, we used to use them but have moved on to m+p.
I have experince of several controllers and shakers, currently the strongest company for controllers is m+p international as for shakers, Gearing & Watson are good for service and support a better long term bet than LDS