REW or OSM for speaker measurements

it is that simple. this box does it all for you:

TZT J-BOX III Audio Speaker Tester Frequency Response Impedance Measuring Box Kit Support for justMLS REW - AliExpress 44

Hey everyone! We've got a 3-way sound system with self-built subs and we're looking to create some presets for our speakers. Up until now, we've been using Open Sound Meter for our measurements, but I've recently come across some discussions suggesting that Room EQ Wizard might be better suited for this type of work. Could someone break down the pros and cons of both software options for speaker tuning and preset creation? I'd really appreciate any recommendations on which direction we should go. Thanks in advance for your help!

However, in the context of this thread, where the OP simply wants to tune his system, suggesting that he needs to be able to measure the impedance is at best misleading.

What kind of hardware did you use for this measurement? Just curious about the minimum that's needed, I found this, is it really that simple?

Yes it is that simple. It is basic ohms law. If you have two resistors in series, the current is the same in both of them. If you know the value of one of the resistors, you can determine the value of the other one by comparing the voltage across each one.

Link to Audio Speaker Tester

Again, in the context of the thread’s original question, my advice would be to wait until the 50% discount is removed, then when you don’t buy it you save twice as much money.

The OP (who is nowhere to be seen) stated 'self-built subs and we're looking to create some presets for our speakers' If you self build my advice would be to check the tuning.

OP only wanted to know if REW was better than OSM.

Anyway, for the benefit of any self-builder, already using Open Sound Meter (or similar),  and therefore assuming that they already have a measurement microphone and an interface to connect it it to the computer. If they want to check the tuning of a reflex cabinet, here are 3 options which all work. Take your pick.

1. Obtain a couple of low inductance, high power, resistors, some cable, and a few connectors, from which you construct an interface which needs calibrating, so that you can measure the impedance from which you determine the resonant frequency.

2. Buy another usb interface as suggested by Jan-2T (discount cost £96.99) which incorporates the resistor and small amplifier, to save making the above interface. Except it uses banana terminals thus requiring a custom lead to connect the loudspeaker anyway. Measure the impedance… etc. etc.

3. Set up the measuring system in the normal way, move the measuring microphone close to the port exit and measure the tuning frequency directly.