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Discussion Starter · #1 ·
Finally recieved dual HO 15s last friday and I spent the weekend putting the logics to reality. Build pics to follow soon....
 

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Discussion Starter · #3 ·
That's a very clean build. Can you post any pics of the finished cab? A REW response will also be of great help. Thanx
 

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Discussion Starter · #4 ·
Finally built the first of dual cabs. Here are the pix;




























Listenting


I wanted to test it raw with no calibration just to check how it performs as it is. Tested the following movies;
  • WOTW (Pod emerging)
  • Knowing (Plane Crash and last scene)
  • Pearl Harbour (japs attack)
  • Master and Commander (First scene)
  • Battle LA (Last scene)


The sub just smiled at those scenes,,,,,Fantastic is the verdict. Very very strong subsonic impact. I think it is easily digging till 13-14Hz. Huge tactile response.


While it gallops over tough LFE fed movies, the short comings were exposed in music. It is not fast and catches the beat a tad late. The bass is flabby in music. I wonder if HO 15 requires breaking in period or not. And if so, how long is that?? Need help on this issue.
 
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Discussion Starter · #6 ·
Phase is correct wrt mains and LP. I haven't run REW sweeps yet coz I wanted to check the raw response, which is great in movies. 50Hz and below, it is tremendous with scary and monsterous impact. That's exactly what I was shooting for
. However, I think midbass (50-80 hz) is weak. I haven't applied any filters in BFD thus far, which is in bypass mode.
 

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Discussion Starter · #7 ·
Ran REW sweeps just now and here are the FRs;

NEARFIELD


The response does not include port contribution as it was taken 2" from the center of the cone;



MLP


Taken at the MLP without audyssey, all EQ off, BFD bypassed, and without speakers;




That's the response with mains engaged. Audyssey and DEQ off and BFD bypassed;





As I pointed out in the earlier post after listening raw, the sub is actually digging down to 13Hz
with monsterous impact, but midbass is weaker. Any thoughts why?? Shall I wait for the break in period and let the rubber surrounds loosen up??
 

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Quote:
As I pointed out in the earlier post after listening raw, the sub is actually digging down to 13Hz with monsterous impact, but midbass is weaker. Any thoughts why?? Shall I wait for the break in period and let the rubber surrounds loosen up??

I doubt it but dang that looks like a stout build.. mmm
 

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"...midbass is weaker. Any thoughts why??"


did you change the location of the sub and/or the location of the listening position?


also, the added extension may be exciting a resonance that is smearing up the time domain if all other things were held equal.
 

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that is a nice close mic sweep on the rss390. i don't recall seeing one before. only a couple db rolloff and no big inductance peak. looks like dayton did a pretty good job on that one too.


it looks like you have a nice big suckout at 72hz. seems to be going around lately. if there is a "fundamental" to mid-bass, that is probably about it. 72hz is 15.7 feet long in wavelength. a 1/4 wavelength reflection will create that kind of suckout. is the subwoofer located around 3.9 feet from a boundary, particularly the wall behind the subwoofer?
 

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Discussion Starter · #13 ·

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What kind of subs did you have before?

I've used Klipsch KSW-10, SUB-12, SW-112, SW-115, Def Tech SC Reference. Still own SC Ref. Of all these subs, SC Ref has the worst price performance ratio. Um still pulling my hair as to why I wasted money on SC Ref. It gives nothing but resonance. Those two PRs coupled with the size of the box and no bracing makes the box unstable and weak.


Before taking on Dayton HO 15 for DIY, I made another ported box with Alpine SWR-1223D (In my signature)......this build proved to be fantastic. Raw listening shows it is surely going down to 15-16hz. Though I haven't calibrated and run any REW sweeps on it. This sub has depth, as well as, tremendous mid-bass. So compared with Alpine, Dayton is lacking in this area.
Quote:
Your graphs look pretty flat so maybe you don't like a flat response?

You are right. I always dial in 6-7dB house curve in the passband. But even without the HC, it is giving me tremendously strong depth.
 

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Discussion Starter · #14 ·

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Can you measure up to 200hz with your mains active?

I had actually measured upto 150Hz. Here is the response of sub only;





And this is the one with mains engaged and crossed at 80Hz in the AVR;





My speakers are Klipsch RF-82 II, RC-62 II, RS-52 II.
 

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Discussion Starter · #15 ·

Quote:
it looks like you have a nice big suckout at 72hz. seems to be going around lately. if there is a "fundamental" to mid-bass, that is probably about it. 72hz is 15.7 feet long in wavelength. a 1/4 wavelength reflection will create that kind of suckout. is the subwoofer located around 3.9 feet from a boundary, particularly the wall behind the subwoofer?

I think you are right coz the sub is about 3 inches from the rear wall, and it can't be pulled out any further. It's actually right in the middle of the side wall in the bay window recess. The LP is also roughly in the middle of the room coz it is a bedroom. The LP is a sofa placed right after the front end of the bed, which makes the LP roughly in the middle of the room. Mains and center channel are 12' from the LP.


I will be starting to build the second sub this weekend and plan on putting it smack in the middle of the opposite wall, which is on the right side of the LP. Do you think opposite locations will help smooth out the midbass?
 

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Discussion Starter · #16 ·

Quote:
Originally Posted by Jay1  /t/1469627/dual-ported-dayton-audio-rss390ho-4-reference-15-build-for-ht#post_23264670


What are your mains?

Here are some pics of the speakers um using and the layout of listening area. Also there is a dome right above the LP.....I wonder if that is screwing the response. I plan on building the second cab and putting it in place of Def Tech along the opposite wall. I hope that will smooth out the response. Any thoughts??













 

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agree with jay. midbass runs easily up to 150hz so having that region eq'd so low relative to the other bass is going to cause it to sound anemic.


the suckout at 150hz is almost certainly 1/4 wave reflection of the mains off the wall behind the mains. that would happen at about 1.9 feet.


with the large distance seperating the mains from the sub and the close proximity to the sub of the listening position, extra care should be taken to ensure the good integration of the sub and the mains. how much delay is there on the mains and on the sub? and are either the subs or the mains wired and/or set for reverse polarity or any other phase changing settings?


turning the sub sideways along the wall will get the driver closer to the wall and reduce the distance and raise the cancellation up out of the subwoofer's passband.
 

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Discussion Starter · #19 ·

Quote:
Originally Posted by Jay1  /t/1469627/dual-ported-dayton-audio-rss390ho-4-reference-15-build-for-ht#post_23268469


Besides the 70 hz area, there's definitely some issues causing the perceived SQ issue.

"Too Low + Suckout" region is where the mains are taking over from sub. I have checked many subs on the front stage next to the mains and have been completely disappointed by the response. The bass becomes completely void and magically disappears as if it isn't there at all. Do you think my room layout is the culprit?
 

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Discussion Starter · #20 ·
The physical distance of the sub from MLP (roughly center seat of sofa) is 5 feet. Setting the distance to 11.5 feet makes the sub in perfect phase with mains wrt MLP offering max spl at xo frequency (80Hz). Polarity is correct.
 
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