Single vs Dual Channel Measurements, or why friends don’t let friend use USB mics

What does single channel or dual channel measurement really mean, and what are the implications of choosing one over the other? This document aims to help answer this.
Strictly speaking, a microphone is a single channel of audio input, in that it is a mono signal. USB microphones which include integrated ADC and USB codec can be considered a single channel device.

Dual channel would be a measurement which includes a second channel of signal input in addition to the microphone....

[krizork]

Hello everyone,
First time post, although I've been scrolling this forum for quite some time.

My question concerns the production change in the AST2560 (https://www.htguide.com/forum/showth...lease-chime-in).

In...

[Jim Holtz]

Just a heads up that between Curt and Efalegalo they have come up with a modification to the original crossover that works better with the new production AST2560's currently shipping. Meniscus has also committed to testing every AST2560 driver ordered to assure the correct crossover parts are included...

[Zvu]

On axis and roughly 30 deg off axis. Calibrated Behringer ECM8000, M-audio FastTrack USB, Holmimpulse. Gate is good to about 85-90Hz.

Measurement conditions



Midwoofer and tweeter





Simulation of Kef's factory crossover>...

[Efalegalo]

Hi All,

I just recently completed my build of The Bordeaux and needed help with crossover issue I'm having.

See attached picture of the frequency response. I have a massive dip in the 1.25Khz - 4.0Khz range.

I've checked the crossover a 100x.
...

[Zvu]

Measurements are done in factory cabinets, gated, at 1m distance mic at tweeter axis - gate is good to 250Hz. Holm-impulse, calibrated ECM8000, M-Audio Fast Track II USB interface Dell Inspiron notebook. Vertical grid is 40dB, with 1dB resolution.

Link to gallery:

https://...

[wkhanna]

jim1961 has been kind enough to offer me some help learning to use REW.

so I have started this thread so others may also gain some information.

my system specs can be seen if you check out my profile link.
basically I am using a 65 liter, bottom-ported version of Jon's...

[JonMarsh]

I've spent too much time talking about the ZA14 in the Dayton Esoteric thread, which is not a good example for a moderator to set for staying on topic. To that end, I'm starting a new thread- it will include my own thoughts and observations, and I expect will eventually include some proposed and tested...

[dsrviola]

I'm about to begin my first measurements/crossover design of a system with a waveguide. I was wondering if people who've worked with waveguide designs do anything different when taking measurements and designing the crossover. Here's the measurements of the tweeter on a flat baffle and in the waveguide:...

[dlneubec]

You may have seen this thread over on PR tech talk. ABS Waveguide Thread Dave Pellegrene has a thread about creating some elliptical waveguides using various plastic materials, a heat gun and a pressing method. He has sent me four samples to do some testing on. All were originally created for the Vifa...

[dlneubec]

This thread is to report on an attempt to make develop a waveguide for use with the Neo3pdr and/or Neo3w. DanP and I worked together to come up with the specs for 4 waveguide prototypes, which he then produced and sent to me. I ordered a Neo3pdr and a Neo3w to test in the waveguides. I received the...

[dlneubec]

Hi all.

I was finally able to get some preliminary measurements of this tweeter on a flat baffle (sort of infinite baffle) and with some custom waveguides. The Transducer labs tweeter is a ceramic dome tweeter. You can read about it here:
TDL N26C



First...

[dsrviola]

I can't find a usable version of this:

https://www.htguide.com/forum/attach...chmentid=17522

Can anyone point me in the right direction?

Thanks!...

[bbcmp1979]

Ok, so I finally got my measurement up and here's my inroom FR for the NatP w/ 1/6smoothing.


I forgot to mentioned that this is measured with the rs28f vs the original design which called for a rs28a. The rs28f does have a rising response on the top end.

I turned it...

[Thooms]

Hi all,

As my active crossover/amp project is approaching completion, I'm starting to think about building a pair of speakers to go with it.

Looking at drivers, I'd really like to build a 2 way using the Peerless HDS / Scan Speak D2608 tweeter along with a Peerless 830875/830883...