Firstly apologies if this is posted in the wrong place. Please let me know if it needs to be moved.
I've just finished a new speaker build and I'm really happy with them. But in the interest of constantly improving I am using a measurement microphone for the first time with REW.
I've just taken a measurement and I see quite a significant dip between 200 and 1000hz. As I'm pretty new to this I am now unsure what to do next to go about getting these more balanced. I am using a JAB5 amp from sure that has a built in DAC so I assume I can make tweaks inside of sigmastudio. Or perhaps the issue is to do with standingwaves inside the enclosure and better padding would help? Any wisdom anyone can impart to get me looking in the right place would be greatly appreciated. Thanks
I've just finished a new speaker build and I'm really happy with them. But in the interest of constantly improving I am using a measurement microphone for the first time with REW.
I've just taken a measurement and I see quite a significant dip between 200 and 1000hz. As I'm pretty new to this I am now unsure what to do next to go about getting these more balanced. I am using a JAB5 amp from sure that has a built in DAC so I assume I can make tweaks inside of sigmastudio. Or perhaps the issue is to do with standingwaves inside the enclosure and better padding would help? Any wisdom anyone can impart to get me looking in the right place would be greatly appreciated. Thanks
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Give more details about the speaker, crossover, and your measurement method.
Moved to multi way speakers.
Moved to multi way speakers.
It's a 2.0 speaker setup.
For the measurement method I was just following a guide on how to use the UMIK-1, So I setup REW with the calibration file for my mic. I then ran a 256k sweep once for each speaker (L and R separately).
Each enclouse contains 1 of the following:
For the measurement method I was just following a guide on how to use the UMIK-1, So I setup REW with the calibration file for my mic. I then ran a 256k sweep once for each speaker (L and R separately).
Each enclouse contains 1 of the following:
Was that guide about measuring loudspeakers or about measuring room acoustics? Anyway, I am afraid you have to explain a lot more about everything before anyone here can help.
Tell us where the mic was placed relative to the speaker you are measuring, whether only one or both speakers were playing, and key dimensions of the room, location of openings, windows, furniture, etc.
In room measurements are always complicated by room modes and reflections.
There is a bit of a learning curve. 🙂
In room measurements are always complicated by room modes and reflections.
There is a bit of a learning curve. 🙂
The JAB5 has four channels, so I'm guessing you have a passive crossover between the tweeter and midrange? Looking at the response there may be some baffle step dropping the response at the low end of the midrange, then the woofer level is set higher
Yes I am using a passive crossover between tweeter and midrange. A 6.8uf monacor capacitor. I will take another look at my crossover in sigmastudio and get back to you. I'm a mac user so have to get out my old sketchy laptop to use sigmastudio.
Oh definitely a learning curve and I'm at the bottom end of it. But that's what I'm here for 😀
Will get the measurements taken when I'm done at work.
You will want to put a coil in series with that midrange. I suspect that is contributing to your rising response as well. Some nice crossover design software would help for getting the passive crossover right. I use Visaton Boxim or Xsim free software. VituixCad is also good. Look for some youTube tutorials to get going with any of these programs. You need measurements of the drivers individually without the crossover, the .frd files, to load into the crossover software. Those files are also available from Parts Express or you can scan data sheet curves with the tool in VituxCad. I measure them with the mic at about 18 inches. Of course you can just get three values of coils and caps and just try different values, measure and listen. Use a crossover component calculator to get some values. Boxsim has a calculator built in.
Firstly, I'd be measuring the speaker - not the room. The treatments for each will be different depending on where the problem lies.
Do you know how to do a gated measurement so you are not measuring your room... and only your speaker?
Do you know how to do a gated measurement so you are not measuring your room... and only your speaker?
Your woofer is 85db, your mid range is 80.5db and your tweeter is 88db. These drivers can work together but there are definitely some problems in your crossover. You will have to have the ability to measure each driver individually and then use some software to help determine what your crossover parts should be. Keep in mind that the woofer is a nominal 4 ohms and the other two drivers are nominal 8 ohm drivers.
When measuring the drivers, keep the microphone in the same spot (ideally 1 meter away directly on axis with the tweeter).
When measuring the drivers, keep the microphone in the same spot (ideally 1 meter away directly on axis with the tweeter).
1. How close was the mic to the speaker?
2. How close is the speaker to the walls?
3. What are your crossover frequencies?
At least post your crossover details and design please and how you came up with the design. That is actual measurements, online calculators, guesswork, someone elses kit etc...)