on Sale - $55/pr (drivers & XO)

[bsl100]

BTW... my question is whether the ND105 will make a difference rear mounted and not rear firing.

[Chris Roemer]

Yeah ! (forehead slap) I see that now.
It would affect phase, but w/out doing a sim, it might not make a huge difference. That would be the issue more-so than a "waveguide" effect.

[bsl100]

Thanks Chris. I got a comment of yours from another thread where you mentioned that rear mount on a baffle effects the mids and highs and that its a real PITA to manage it in the XO.

Anyways, I did a bit more reading and have found that rear mounting does have an effect on diffraction due to baffle effects.

I am linking a recent YouTube video which highlights the effects of a chamfer/roundover on a tweeter. Notice the effect on the graphs from 2KHz onwards.

https://youtu.be/D11m8R1_daI

[bsl100]

I have seen a few Nano Neos built with the ND105 being rear mounted behind the baffle (PWR RYD, Gracias). In some cases, even the ND20FA is rear mounted.

Since the crossover point is around 3KHz, there might be some rise in the mids around 1.5KHz to 3Khz and beyond.

in the absence of measurement equipments, it might then be a bad idea to rear mount when the original design calls for a flush mount or front mount.

[Chris Roemer]

Yes, but...
(aside from phase issues) rear mounting the tweeter (which has greater dispersion) will have a greater effect on its FR than rear mounting the woofer (only).

[PWR RYD]

I have seen a few Nano Neos built with the ND105 being rear mounted behind the baffle (PWR RYD, Gracias).

I have designed and built two different speaker projects with the ND105, both rear mounted. I have never built a pair of Nano Neos. I have heard them though

[bsl100]

@ Craig.... Sorry. My bad. I just saw that post. It was the "Maddies" that were built by you. You had posted about baffle diffraction effects due to rear mounting the ND105-4 and the tweeter. You have mentioned that by rear mounting the tweeter you got a bit of a bump in the 2.5k to 4khz range.

I was researching about rear mounting the ND105 and I was concerned about the bump in that region as I was crossing it around 3khz. I have no measuring equipment and didnt know how to factor that in my crossover modelling in XSim.

[bsl100]

So, I decided to do my own listening tests. I earlier had the ND105-8 woofers rear mounted and crossed over to the ND20FB-4 at 2.8khz. The baffle and cabinet is 1/2" thick MDF. The tweeteris anyways a rear mounted design with it being flush with the baffle after installation.

Today, I mounted the ND105-8 on the front of the baffle and gave it a listen. The mids, particularly voices became slighty more open and cleaner. Off axis response was slightly better.

[Spaker]

People remark on my Nano Neo pair more than any other speaker set I have fabricated. The look gives it something futuristic and sexy. So I hear. I've always used pretty tame power to push my Neos. Desktop near field computer speakers. Bedroom LEDTV stereo speakers, etc. But I'm wondering how hard can these bad boys be pushed? They always seem to have more to give when I've attached them to 20 & 50 wpc amps. What about you guys? Anyone gone too far and found the absolute limit? Anyone hooked a pair up to something preposterous, only to be shocked and confused? How far can these go? Come on scientists! I want charts and graphs and language with words I need to look up in order to get proper context. Take it to the edge Nano Neo challenge Sent from my SM-G892A using Tapatalk

[Chris Roemer]

I've heard the AURA NS3s (probably the "precursor" to Dayton's entire ND midbass line) "squeal" when they were being cranked by an old 1970s amp (maybe 50w RMS/ch?) when someone accidentally hit the CONTOUR button. Ungodly noise they made (for several seconds). No apparent damage though :-) !