DIY speaker project - Impedance and FR measurements, advice on hardware and process?

1185 Views 1 Reply 2 Participants Last post by dgmartin, Sep 25, 2015

Jonesy_SA

Discussion Starter · Sep 24, 2015

Hi all

I would like to design and build a 2 way system based on some speakers I have obtained with no available data. I have only commenced reading on the topic however I understand I will need to obtain impedance measurements of Thiele and Small parameters to design an enclosure, then measure the drivers in the enclosure for FR (Frequency Response curves) in order to design a crossover.

I’m told ARTA – LIMP and REW software will be capable of this, however REW has a stronger support forum

I’m not sure if my my pc’s built in sound card has stereo input, and cant find a logical way to check. I had planned on purchasing the Behringer UC202/222 which a few have been using with both software, however I came across the following post:
http://www.avsforum.com/forum/155-diy-speakers-subs/1408068-uca202-owners-please-read.html
Will this be an issue for what I intend to use it for?

Can anyone recommend an internal or external sound card that is say <$35
I will be building the simple jig shortly, should I use metal film or carbon resistors, and 1 watt or .5 watt (I believe the Behringer puts out about 1.2w so that would necessitate at least a 1w resistor?)

If anyone has any guides, links or advice specifically related to what I wish to achieve or please pipe in.
Many thanks

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dgmartin

· #2 · Sep 25, 2015

Jonesy_SA said:
I would like to design and build a 2 way system based on some speakers I have obtained with no available data. I have only commenced reading on the topic however I understand I will need to obtain impedance measurements of Thiele and Small parameters to design an enclosure, then measure the drivers in the enclosure for FR (Frequency Response curves) in order to design a crossover.

Can anyone recommend an internal or external sound card that is say <$35
I will be building the simple jig shortly, should I use metal film or carbon resistors, and 1 watt or .5 watt (I believe the Behringer puts out about 1.2w so that would necessitate at least a 1w resistor?)

This is basically the design process. There are several good sites about the design process. You can learn a lot from "zaphaudio", troels gravesen and the like, just to name a few. You may try posting pictures of your drivers. Chances are that people here or at diyaudio would recognize drivers from major manufacturers.

Within that budget, you are probably better off looking for used sound cards. 1W metal film is fine.

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