[this_is_vv]

After making 2-3 speakers i need to get Mic etc for calculating speaker frequency response

i am currently using active crossover ....DCX 2496

[JohnR]

This may not be what you are looking for but do it right, get a calibrated mic from Herb. See my review here: http://www.hifizine.com/2012/09/dayton-emm-6-measurement-microphone-calibrated-by-cross-spectrum-labs/

You'll need a USB soundcard, check on the REW forum. I have a couple in for review but can't make specific recommendations at this point.

[richidoo]

Dayton Omni-mic is gaining popularity among DIY speaker builders since it was introduced a couple years ago. It is self contained, just plug into USB port and load software. The testing software is pretty comprehensive, and the measurement export format allows importing into Jeff Bagby's free crossover simulation software Passive Crossover Designer.  It's $300.

http://www.parts-express.com/pe/showdetl.cfm?partnumber=390-792

Alternately, you can use free software called Room EQ Wizard from hometheatershack. You need a small diaphragm condenser microphone to measure low frequencies accurately, but LF measurements in room are usually inaccurate anyway due to room echo. So a cheaper microphone is OK if you ignore the info below 100Hz. I have read that even the $5 dynamic mics that come with desktop computers are fairly accurate in SPL above 100Hz. Test signals are usually sine waves, which are easy for any mic to capture fairly accurately. Real tone of music requires faster mics.

[jackman]

I would suggest going in on an Omnimic witha couple friends.  Each guy chips in a hundred bucks and you share the device.  I've used it with the DCX2496 and its a very useful tool.  It's easy to use and works well.  Once you set up your system, you don't need to use it again unless you make changes.  It's the perfect tool to split among friends.  If you can swing the three hundred bucks, you can probably use it and sell it once you get your system set up.  Maybe you could get one and rent I out to people.  It's not something you would use every day and renting would be ideal.

The one I used was borrowed.  Actually, Phil Bamberg technically used it because he set up my speakers/EQ.   

Highly recommended.