Official Rythmik Audio Subwoofer thread - Page 1453 - AVS Forum | Home Theater Discussions And Reviews
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post #43561 of 44634 Old 05-27-2020, 09:00 AM
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Originally Posted by drh3b View Post
If it makes you feel any better, I found having an F18 behind my old chair very distracting for music, as it was constantly vibrating the wooden frame. I didn't try it with movies, the effect might be more enjoyable that way. Haven't tried it with my newer chair. Also, I lost a whole bunch of low end reinforcement with the F18 near the middle of the room.
That has been my experience as well. I've been preaching that subwoofers really are best against the walls!
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post #43562 of 44634 Old 05-27-2020, 09:28 AM
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Originally Posted by raylover79 View Post
The FV18 with Silver cone looks very beautiful. Can you upload a FV25HP with Silver Cone? never seen one.
Just to ask. Does the silver driver have different from the black aluminum driver? As in how would a paper cone differ from other materials.
Did see someone post a 2 piece cone as well, metallic again. How does someone choose?

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post #43563 of 44634 Old 05-27-2020, 09:33 AM
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Originally Posted by gary bechtold View Post
yeah i agree. This isn't any better....


ok i'm done for now?
terminate! Terminate!
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post #43564 of 44634 Old 05-27-2020, 09:33 AM
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Originally Posted by BhootZ View Post
Just to ask. Does the silver driver have different from the black aluminum driver? As in how would a paper cone differ from other materials.
Did see someone post a 2 piece cone as well, metallic again. How does someone choose?

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The FV18 has aluminum or paper. The aluminum can come anodized black or non anodized silver. Other than color there is no difference with aluminum.

Some of the 15” models have one and 2 piece cones.
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post #43565 of 44634 Old 05-27-2020, 09:50 AM
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Originally Posted by tvuong View Post
Not trying to stay sided with Rythmik here but is it me or do you guys also think the port on Rythmik looks better than psa? The 4 screws on the psa port look cheap to me.

Smart of Tom to put the driver at the bottom, though, for better room coupling. Plus the port cannon is better aimed to fire at the listener
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post #43566 of 44634 Old 05-27-2020, 09:52 AM
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Originally Posted by BhootZ View Post
Just to ask. Does the silver driver have different from the black aluminum driver? As in how would a paper cone differ from other materials.
Did see someone post a 2 piece cone as well, metallic again. How does someone choose?

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Silver cone is un-Anodised aluminium cone so they both are same. The two piece cone is the cone that is used for the FVX15 and the single piece cones are used in FV15 and FV25 (these 2 subs have different model drivers anyway)


Can some one enlighten me the difference between the DS1510 and the DS1520 Drivers?
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post #43567 of 44634 Old 05-27-2020, 09:59 AM
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Originally Posted by raylover79 View Post
And, what is the difference between the DS1510 and the DS1520? The Rythmik website describes both the drivers to have 3" Voice coil, 200 oz magnet and +-20mm Xmax.
Ohm rating is lower on the 1520 to take more power.
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post #43568 of 44634 Old 05-27-2020, 10:05 AM
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Originally Posted by Soulburner View Post
Smart of Tom to put the driver at the bottom, though, for better room coupling. Plus the port cannon is better aimed to fire at the listener
When are you buying his subs?

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post #43569 of 44634 Old 05-27-2020, 10:06 AM
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Originally Posted by tvuong View Post
Ohm rating is lower on the 1520 to take more power.
More power handling capability but same xmax(+-20mm), does it also mean that the new DS1520 driver is less sensitive?
Just curious because I have ordered a FV25HP with Silver Cone option.
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post #43570 of 44634 Old 05-27-2020, 10:16 AM
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^^ No, the ohm rating is the ONLY difference between the 1510 and 1520 drivers. I do not design the sub but if I have to guess, the 1520 with lower ohm (2) allows Brian to have two in series in the FV25 for a total of 4Ohms, whereas the 1510 at 3ohms each would make it 6Ohms in the FV25. The 1520 is only used in a 2 drivers box (FV25 and G25).

Congrats on scoring two outstanding performing subs. The silver cones are very sleek and beautiful looking drivers.
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post #43571 of 44634 Old 05-27-2020, 10:32 AM
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Originally Posted by tvuong View Post
^^ No, the ohm rating is the ONLY difference between the 1510 and 1520 drivers. I do not design the sub but if I have to guess, the 1520 with lower ohm (2) allows Brian to have two in series in the FV25 for a total of 4Ohms, whereas the 1510 at 3ohms each would make it 6Ohms in the FV25. The 1520 is only used in a 2 drivers box (FV25 and G25).

Congrats on scoring two outstanding performing subs. The silver cones are very sleek and beautiful looking drivers.
The amp used in the FV18HP and FV25HP is stable to 2 ohms. The FV25HP has 2 amp modules instead of one with each driving a single driver. The lower ohm rating allows the amp to produce more power.

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post #43572 of 44634 Old 05-27-2020, 10:44 AM
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Originally Posted by tvuong View Post
^^ No, the ohm rating is the ONLY difference between the 1510 and 1520 drivers. I do not design the sub but if I have to guess, the 1520 with lower ohm (2) allows Brian to have two in series in the FV25 for a total of 4Ohms, whereas the 1510 at 3ohms each would make it 6Ohms in the FV25. The 1520 is only used in a 2 drivers box (FV25 and G25).

Congrats on scoring two outstanding performing subs. The silver cones are very sleek and beautiful looking drivers.
They are not configured in series. Each DS1520 driver has an independent 900 watts Hypex amp module. The DS1520 is rated 2.0 ohms and the DS1510 is rated 3.0 ohms. The HX1000XLR3 amp uses 1 x Hypex UCD700LZOEM amp module and the HX2000XLR amp uses 2 x Hypex UCD700LZOEM amp modules. The Hypex UCD700LZOEM is rated 1200 watts @ 2 ohms, 700 watts @ 4 ohms and 440 watts @ 8 ohms. Hypex power rates are "Short Term". Quoting from Brian: "the main problem is getting the power supply high enough that the output can be sustained. In our measurements, 900WRMS is real world number".

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post #43573 of 44634 Old 05-27-2020, 10:47 AM
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Originally Posted by tvuong View Post
^^ No, the ohm rating is the ONLY difference between the 1510 and 1520 drivers. I do not design the sub but if I have to guess, the 1520 with lower ohm (2) allows Brian to have two in series in the FV25 for a total of 4Ohms, whereas the 1510 at 3ohms each would make it 6Ohms in the FV25. The 1520 is only used in a 2 drivers box (FV25 and G25).

Congrats on scoring two outstanding performing subs. The silver cones are very sleek and beautiful looking drivers.
Have ordered the FV25HP with silver cone 12 days ago through the Indian dealer. Now waiting for the sub.
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post #43574 of 44634 Old 05-27-2020, 10:48 AM
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Originally Posted by enricoclaudio View Post
They are not configured in series. Each DS1520 driver has an independent 900 watts Hypex amp module. The DS1520 is rated 2.0 ohms and the DS1510 is rated 3.0 ohms. The HX1000XLR3 amp uses 1 x Hypex UCD700LZOEM amp module and the HX2000XLR amp uses 2 x Hypex UCD700LZOEM amp modules. The Hypex UCD700LZOEM is rated 1200 watts @ 2 ohms, 700 watts @ 4 ohms and 440 watts @ 8 ohms. Hypex power rates are "Short Term". Quoting from Brian: "the main problem is getting the power supply high enough that the output can be sustained. In our measurements, 900WRMS is real world number".
I wonder what "short term" would equate to? I know that the amp is rated 900 watts RMS and 1800 watts peak but I'm not sure what the duration of short term and peak are.

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post #43575 of 44634 Old 05-27-2020, 11:07 AM
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I wonder what "short term" would equate to? I know that the amp is rated 900 watts RMS and 1800 watts peak but I'm not sure what the duration of short term and peak are.
Short term could be seconds (1 or 2 seconds, maybe?) while peak is usually milliseconds. Hypex amps have thermal protection circuits that prevent the amp goes beyond their power rates after they have reached certain temp threshold. What really matters here is that our measurements show a sustained 900WRMS no matter how long the subwoofer is used.
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post #43576 of 44634 Old 05-27-2020, 11:10 AM
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Originally Posted by raylover79 View Post
Have ordered the FV25HP with silver cone 12 days ago through the Indian dealer. Now waiting for the sub.
It's worth it, trust me. I've heard the fv15hp and I thought it would be too big for me. The Fv25hp.
BTW Are you alphacentury?

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post #43577 of 44634 Old 05-27-2020, 11:14 AM
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Originally Posted by Soulburner View Post
Smart of Tom to put the driver at the bottom, though, for better room coupling. Plus the port cannon is better aimed to fire at the listener
I have my FV18 on its side (mainly for space reasons), but I did notice a slight improvement in frequency response as a result.
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post #43578 of 44634 Old 05-27-2020, 11:31 AM
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I have my FV18 on its side (mainly for space reasons), but I did notice a slight improvement in frequency response as a result.

Nice.

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I have my FV18 on its side (mainly for space reasons), but I did notice a slight improvement in frequency response as a result.
I’m trying (unsuccessfully) to convince the missus to let me convert the yoga blocks as woofer feet when flipped upside down for last 30 mins. Sadly I lack a carpet hence the isolation issues are real. Also wouldn’t want to scratch or nick the beauty.

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post #43580 of 44634 Old 05-27-2020, 11:33 AM
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Originally Posted by Soulburner View Post
Smart of Tom to put the driver at the bottom, though, for better room coupling. Plus the port cannon is better aimed to fire at the listener

Does coupling depend on floor type at all? Does that work better with one floor type over another or is it a universal type effect tied merely to the distance between sub and floor?

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I’m trying (unsuccessfully) to convert the yoga blocks as woofer feet when flipped upside down. Sadly I lack a carpet hence the isolation issues are real. Also wouldn’t want to scratch or nick the beauty.
That is actually the biggest challenge I have had. I have carpet sliders under each corner, but without the subwoofer feet to keep them in place, when moving the sub, it has a tendency to slide off of the sliders. Just not enough friction between the carpet slider and the sub to keep them in place.
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post #43582 of 44634 Old 05-27-2020, 12:24 PM
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I have my FV18 on its side (mainly for space reasons), but I did notice a slight improvement in frequency response as a result.
It's looking like I'll have to do the same, though I'm not looking forward to making amp adjustments with the amp against the wall.

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post #43583 of 44634 Old 05-27-2020, 12:25 PM
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Does coupling depend on floor type at all? Does that work better with one floor type over another or is it a universal type effect tied merely to the distance between sub and floor?
It's just based on distance. SBIR affects subs the same way it affects speakers.

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post #43585 of 44634 Old 05-27-2020, 01:15 PM
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That is actually the biggest challenge I have had. I have carpet sliders under each corner, but without the subwoofer feet to keep them in place, when moving the sub, it has a tendency to slide off of the sliders. Just not enough friction between the carpet slider and the sub to keep them in place.
Something like this may be able to isolate.. Beeter if you can DIY or remove the wheels, but I feel this should do the job of not having feet.

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post #43586 of 44634 Old 05-27-2020, 01:55 PM
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Originally Posted by Soulburner View Post
Smart of Tom to put the driver at the bottom, though, for better room coupling. Plus the port cannon is better aimed to fire at the listener
So I'll ask the dumb question I have never seen addressed on this thread...we all know the FV18 can be used on its side. Could it be used upside down? Triple-cannon action out the top?
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post #43587 of 44634 Old 05-27-2020, 02:20 PM
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So I'll ask the dumb question I have never seen addressed on this thread...we all know the FV18 can be used on its side. Could it be used upside down? Triple-cannon action out the top?
If you put the triple-cannon at the top, it reduces the boundary enhancement effect. For subwoofer with boomy bass, that is THE way to reduce the boominess. But it certaily reduces the energy coupling to the floor and energy reflection. Place the unit side-way can gain the max boundary enhancement.
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Originally Posted by Rythmik View Post
If you put the triple-cannon at the top, it reduces the boundary enhancement effect. For subwoofer with boomy bass, that is THE way to reduce the boominess. But it certaily reduces the energy coupling to the floor and energy reflection. Place the unit side-way can gain the max boundary enhancement.
So, if using the FV18 on its side, would it be most beneficial to plug the port furthest from the floor rather than the middle port?

Electronics: Denon X4400, Vizio M65
Sub: Rythmik FV18-PC x 2
Speakers: 3 x Chane A2.4 LCR, DIYSG Volt-6 Surrounds
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post #43589 of 44634 Old 05-27-2020, 02:41 PM
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I'm guessing that the FVX12 and F12 use a different driver?
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post #43590 of 44634 Old 05-27-2020, 04:08 PM
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Quote:
Originally Posted by DonH50 View Post
I think the writing on her (?) hand says "NERD" but maybe I am just self-projecting...
My Bad. You are indeed correct, after increasing the picture. It does say NerD, with a small e and r. That did look like P and Y, on a smaller picture since the N and D were in capital letter.


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Last edited by darthray; 05-27-2020 at 04:12 PM.
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f12g subwoofer , fvx12 , fvx15 , integra dtc 9.8 , lv12r , Rythmik , Rythmik Audio , Rythmik Audio F12 Direct Servo Subwoofer , Rythmik Audio F15 Subwoofer , servo sub

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