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View Full Version : 2453H-SL on STX825 waveguide over 2265g-1 center channel



nyt
01-08-2017, 04:13 PM
Just got this together the other day to replace a 3677 I was using as a center channel. I needed something that could fit under my screen and wanted something to that would match my left and right closer (4722 with 2452h-be). Very happy with how this came out, sounds great. I considered using the D2430k, but I like the 4" aquaplas and Be CDs better after comparing them back to back.

I'm running this full active driven by a pair of NC400s using brutefir for processing and an RME fireface UFX+ interface. Keeping the noise floor low was a challenge, but the good interface plus a 12db pad from an autoformer worked well. I compared the 4722s with the network driven by my AVR to running with the active setup and the active config actually ended up quieter.

My build on left, 3677 right.
http://i.imgur.com/p8s1kL6.jpg

guts, 3636 autoformer and 100uf cap
http://i.imgur.com/V5MjhZT.jpg

bracing and damping
http://i.imgur.com/n3rDKg8.jpg

CD w/ spacer
http://i.imgur.com/0Cq9ux1.jpg

"Rough" eq/xover, will refine this later.... 1/48 smoothing with 35 cycle window.

http://i.imgur.com/RqX9Y5A.png

time aligned step response and impulse. Some room interaction here. I wanted to measure this outside, but winter and snow had different ideas.
http://i.imgur.com/5xC3CbL.png

linear phase
http://i.imgur.com/14rMm08.png

http://i.imgur.com/13wHn0j.png

native response of 2453h-sl on stx825 w/ spacer. There's a bit of a gnarly dip/phase issue without it.
http://i.imgur.com/MIpkdoQ.png

All components without any EQ

http://i.imgur.com/uPWQJg2.png

srm51555
01-08-2017, 06:28 PM
Nice work and welcome to the forum!

nyt
01-08-2017, 06:41 PM
Nice work and welcome to the forum!

Thanks, been lurking for a while ;) I mostly post @ avsforum

pos
01-08-2017, 10:45 PM
Nice build!!
Where did you get that autoformer?
Have you considered lowering the gain on the nc400 module?

nyt
01-09-2017, 06:31 AM
Nice build!!
Where did you get that autoformer?
Have you considered lowering the gain on the nc400 module?


It's a 3636 from http://www.critesspeakers.com/autotransformers.html

I considered lowering it it, but not really worth it. I'd have to raise the level on the AVR to make up for it.

pos
01-09-2017, 08:27 AM
I am using the 3654 myself, similar to yours but with -3/-6/-9/-12 attenuation values (double the impedance each time) and all the taps on the same side.