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@Timothy1180 where are you moving from/to in Cali? SoCal? I'm sure @kyzer soze and I would love checkout your extremely capable setup (Especially once FV25s are added). You have a unique perspective in regards to focusing on the 20-60Hz octaves for your subs. I think I can tolerate your extreme >120dB LFE for some demos one afternoon.

I have 3 rooms w/5.1 or more. One capable of single digit response (sealed PSA subs). One with output down to 15Hz (ported Seatons). My bedroom system doesn't have much below 25Hz but can still rock (4 subs, 2 under the bed). We rarely ever listen above -10dB MV with subs +10dB. In all cases LFE caps out between 110-120dB.

I have found pleasure in achieving greater tactile response at lower SPL levels (utilizing nearfield placements and TTs). I do utilize D + M processors BTW, but my outboard amp sensitivities are only 0.8V & 1.0V.

What is your thought concerning the 60-120Hz? Do you let your mains deal with this octave. How do you rank its importance vs 20-60 Hz and
 

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Im currently running 2xPB13 Ultras and 1xPB16 in my HT / living room.

Can / will the FV25HP play well with the SVS Ultras?

any advise would be appreciated.
Can you provide more information regarding your space and current setup? What are you lacking and hoping an additional sub would provide? Is another PB16 an option or is there a reason you are looking to go another direction?
 

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Can you provide more information regarding your space and current setup? What are you lacking and hoping an additional sub would provide? Is another PB16 an option or is there a reason you are looking to go another direction?
well.....

I have met with dealer of Rythmik China and have received a good offer for a unit here. As I am a bit of an extreme bass head I was curious if I could mix this dual sub with my other units. Im honestly not lacking bass but I guess you can call me a bass crack head and I cannot get enough...
 

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Epik conquest: amazing sub. Huge 18" driver. Probably better than most made now. Earth shattering lows.

Epik empire: chad talked me into these. I had 4. Dual opposed 15". Huge mid bass. Usable output down to 8-10hz. Especially with 4

Seaton submersivehp: amazing sub but sounded like 2 epik empire. After empire amps died I wanted something different

Svs:tried pb1000 not good anywhere. Was going to be bedroom sub. Pb2000 it's ok was bought for my sons room nothing life changing. Svs pc12plus was bought to save room and no midbass and lows were just so so. Big disappointment. Pb13ultra was ok again but not what I wanted. I wanted 30-60hz bass that sounded clean and loud above 120db. So I gave up on svs.

Psa: than I went to Psa. Lol. Got two xv15 was really surprised how good they were. Excellent lows and midbass slam. Than I wanted more

Rythmik: got one rythmik lv12r for my music room. Just was ok. It made some bad noises and hit limiter easily. Also got two Rythmik fv15hp. Was great. Had that high sound quality. Almost like a sealed sub with ported output. Than I called Tom at Psa. Lol

Psa: Tom talked me into Xv30fse and took one of my Rythmik as trade. Lol. Great guy. He still has it. I kept one fv15hp for music room. Still have it. Xv30fse was a monster and gave me amazing output but was really similar to fv15hp. So I wanted more so I added two xs30 to the mix. Great subs. Midbass was there. Lows was there it was perfect. Than we moved and we no longer had media room. Damn my disease that stopped me from working. Lol

We moved and I tried svs that I already talked about like pc12plus. Needed smaller footprint.

hsu: vtf3 mk5 for my bedroom was incredible was very tunable and really good tight clean bass. Just recently sold it was overkill

Than wife said I could have one awesome sub in our living room so I went dss. Found a guy selling used locally.

Dss: had the 24" mariana. Great sub. So clean. Was very happy with low extension and so much output everywhere. I think I fell in love with the hi end look. I was missing what I had once before. So I sold it.

Jtr:cap1400. Was great sub. Maybe the best single sub I had. Massive output. Great sound quality. Sub screams don't turn the lights on. Wife hated the look. So it was gone.

Psa: talked wife into two psa v1800. Moved everything around. To get two subs in. Everything was better again. I realized I needed 2 subs at least. The bass just wasn't what my rythmiks were or my old Psa setup. They were good just a looser sound. If that makes since.

Rythmik: back to two fv15hp with xlr master slave. Brian informed me they had new drivers. Made me happy! Wow as soon as I heard them I was back to what I wanted. Deep clean bass. Was perfect for me. Brought me back to the sound of my 4 epik and my seaton. That sealed slam with the ported lows. Great combo.

Now we are moving again to a bigger house with a media room. First thing I do in that room is 2 fv25 to go with 2 fv15hp. It'll be the best system I've ever had.

Sorry for such a long post. If you want me to go into more detail about certain sub I will. Just didn't want to go to crazy. Lol
Thanks. 2FV25's and 2 FV15's, I envy you :) what is yoor room size?
 

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On gain structure: Most consumer amplifiers have enough gain to reach full-scale output with 1-2 Vrms input. Consumer components have that in mind. No use clipping the amp's input. Pro amplifiers typically accept 4 V rms or more since pro levels are higher by default (noisier environment, more headroom needed for live work, etc.) To imply a component is bad because it has lower output is generally erroneous, and having much higher output than ever needed is not always an advantage. Not that clean power and high SPLs without distortion are bad, but you really have to look at the overall gain chain and system requirements, not just pull one number out in isolation.

IME/IMO - Don
 

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Never inferred anything about over 100 db about you. I was talking about other people that I know and have heard their systems. I saw you say you don't exceed 115-120db. The fv18 is a awesome sub without a doubt! I'm glad you are very happy with them. I'm a huge rythmik fan. I didn't say get something like a pair of svs pb2000. I said a pair of fv15hp would of been plenty. The fv18 is without a doubt better than fv15hp. Maybe I'll talk to Brian again soon about this, but it's only 2db louder in the lower bass. And around that in the mid bass as well.

The sound quality on fv18 and fv15hp will be very similar. Except fv18 gets louder. Which is great. At 115 db it would be hard to tell the difference from fv18 and fv15hp.

My next move will be two fv25 in stereo with my two fv15hp near field. Two fv15hp stacked is better than one fv25.

Also that might be why your getting so many rattles and creeks. That low bass isn't really useable to all. You might want to change your settings and run sub wide open to cut those low frequencies out.

Those are just my observations. I do love it loud I won't apologize for that. I also enjoy clean sounding subs. That's why I stick to rythmik. Jtr you talked about are monsters and very nice. I'd just never want a sub that looks like that again.

I've done seaton. Jtr. Psa. Epik. Elemental. Hsu. Svs. Deep sea and more.

Just keep coming back to rythmik. Lol
I apologize if I took your last post too personally. Anyway, it encouraged me to breakout my UMIK-1, open the SPL meter in REW, and check what my peaks listening levels are. I watched the scene of the initial assault in Hacksaw Ridge in which the battleships pound the Japanese positions with 16 inch gunfire before the Army launches the attack. The peaks were between 100 and 105 SPL but I was getting as much of that in the
 

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I apologize if I took your last post too personally. Anyway, it encouraged me to breakout my UMIK-1, open the SPL meter in REW, and check what my peaks listening levels are. I watched the scene of the initial assault in Hacksaw Ridge in which the battleships pound the Japanese positions with 16 inch gunfire before the Army launches the attack. The peaks were between 100 and 105 SPL but I was getting as much of that in the
 

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@Timothy1180 where are you moving from/to in Cali? SoCal? I'm sure @kyzer soze and I would love checkout your extremely capable setup (Especially once FV25s are added). You have a unique perspective in regards to focusing on the 20-60Hz octaves for your subs. I think I can tolerate your extreme >120dB LFE for some demos one afternoon.

I have 3 rooms w/5.1 or more. One capable of single digit response (sealed PSA subs). One with output down to 15Hz (ported Seatons). My bedroom system doesn't have much below 25Hz but can still rock (4 subs, 2 under the bed). We rarely ever listen above -10dB MV with subs +10dB. In all cases LFE caps out between 110-120dB.

I have found pleasure in achieving greater tactile response at lower SPL levels (utilizing nearfield placements and TTs). I do utilize D + M processors BTW, but my outboard amp sensitivities are only 0.8V & 1.0V.

What is your thought concerning the 60-120Hz? Do you let your mains deal with this octave. How do you rank its importance vs 20-60 Hz and
 

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Room is 20' by 25' by 20'. Open on two sides.

Your fv18 are also awesome subs and your right jtr is a great company. They just are making so many great subs now. Every company has so much spl now. Most people don't need that much bass.

My friends have two cap orbit shifters. They are incredible but a lot of people might be surprised that in the 115-125db range my rythmik sound better. Now his gets louder. It just starts to sound sloppy the louder it gets.
 

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was spl meter set to z weighted and fast? the spl logger is real good for this and you won't miss any split second peaks and z weighted insures you capture the under 30Hz stuff
Yeah, one of the Wise Men who post to the REW thread had warned me about the need to set the REW SPL meter for Z weighting and Fast in order to accurately measure all of the LFE so I did it. Interestingly, I also checked to lean what my old RadioShack SPL meter said. It thought the peaks were
 
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What do you think of Canare star quad cable if the source has RCA output and the amp has XLR input with this components? Someone told me that this is better than a standard RCA-RCA connection & will help in noise reduction.
Male XLR to Male RCA
XLR cable with star quad
Using that adapter won't make the connection better because it will work the same as a RCA cable (unbalanced). You can make a RCA out (unbalanced) balanced using a passive or active DI box. A passive DI box that I recommend for this kind of job is this one:

https://www.amazon.com/Whirlwind-Direct-Interfacing-Outputs-Players/dp/B0002OKGNK/ref=sr_1_1?ie=UTF8&qid=1493816165&sr=8-1&keywords=pc+di+box

You can find cheaper DI boxes for about $20, though.

The Canare star quad cable is a good cable. All my XLR cables are Mogami Studio Gold (quad cables as well).

In reference to the the bolded part of your post, this piece, written by Bill Whitlock of Jensen Transformers, shows the circuitry for the XLR-RCA connection noted above. See figure 2.1. The piece also has a lot of good information on balanced connections. Mr. Whitlock is an expert in this field. You can often find his presentations on YouTube.

http://www.jhbrandt.net/wp-content/uploads/2014/11/Interconnection_of_Balanced_and-Unbalanced-Equipment.pdf

While an XLR to XLR connection would be best, a connection of an RCA output to XLR input using the set of cables noted in the first post, if that's all that is available, can be an improvement over RCA to RCA, as Mr. Whitlock notes.
 

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What do you think of Canare star quad cable if the source has RCA output and the amp has XLR input with this components? Someone told me that this is better than a standard RCA-RCA connection & will help in noise reduction.
Male XLR to Male RCA
XLR cable with star quad
Hmmm... (1)Quad cables typically comprise redundant twisted pairs to provide greater common-mode suppression for long microphone runs. I have seen folk talking about it here (AVS) and on other audio forums but to me it seems like overkill for line connections in general and even more so for a sub. The capacitance is also higher, not usually a big deal for line level signals in general and less so for subs, (2)but again why bother?

(3)I do not know how the connectors are configured. Obviously going to an RCA (single-ended) connection at one end means you lose a lot of the benefits of differential connections. Where an extra shield can benefit is if the signal ground is isolated from the cable shield, usually by a small resistor or directly tied to chassis ground (at a different place than signal ground) and/or by disconnecting the shield at one end so it acts a Faraday'ish shield without any signal current. Typically the latter is done by tying the outer shield to the ground pin of the XLR and leaving it floating at the RCA end. That way the outer shield provides some shielding of HF noise (RFI) and doesn't corrupt the inner signal ground return.

Personally if I needed such a configuration I'd go with coax that has an extra outer shield and do the same thing but without the twisted pair. If you are in a very high-noise environment and the differential receiver has good common-mode rejection that could benefit. In the real world common-mode rejection is all but gone by the time you reach a few hundred kHz to a few MHz so it may not do much good anyway.

If you really need differential, then run XLR to XLR and use a transformer (typical passive DI boxes use that approach, like the one Enrico linked) or active circuit (active DI box) to convert back to single-ended just before the RCA connector.

Random babbling - Don

(1) If you mean star quad cables in this part of your post, then that statement isn't correct. Star quad cables aren't made up of multiple twisted pair cables; multiple conductors, but not multiple twisted pairs. There is a difference. Perhaps you are thinking of Ethernet or HDMI cables. Here are a couple good links to the details of star quad construction and demonstration of the benefits.

https://benchmarkmedia.com/blogs/application_notes/116637511-the-importance-of-star-quad-microphone-cable

https://benchmarkmedia.com/blogs/application_notes/117842759-star-quad-cable-demonstration-video

(2) Hopefully the links above, and other information that is easily obtained on the Internet will help you answer this question.

(3) It's rather obvious that the RCA male is connected to the output of a piece of equipment, the XLR male on the other end of that cable is then connected to the female end of the XLR cable. The male end of the XLR cable is then connected to the input of a piece of equipment. How else would you connect this set of cables using standard equipment? While this connection is not as good as an XLR to XLR connection, it can provide improvements in performance if only an RCA output is available.

Here is a piece (this link is included in a nearby post as well), written by Bill Whitlock of Jensen Transformers, that shows the circuitry for the XLR-RCA connection noted above. See figure 2.1. The piece also has a lot of good information on balanced connections including the use of transformers. Mr. Whitlock is an expert in this field. You can often find his presentations on YouTube.

http://www.jhbrandt.net/wp-content/uploads/2014/11/Interconnection_of_Balanced_and-Unbalanced-Equipment.pdf
 

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Room is 20' by 25' by 20'. Open on two sides.

Your fv18 are also awesome subs and your right jtr is a great company. They just are making so many great subs now. Every company has so much spl now. Most people don't need that much bass.

My friends have two cap orbit shifters. They are incredible but a lot of people might be surprised that in the 115-125db range my rythmik sound better. Now his gets louder. It just starts to sound sloppy the louder it gets.
There really are a lot of great subwoofers available from high end makers these days. When I bought my Hsu VTF-3 MK3 Turbo nine years ago, I thought its 12 inch driver, large ports and 350W amp would be all I would ever need. Ha! My Hsu sub was great for the money and for its day. These days, though, the exponentially superior modern subs now available from Rythmik, JTR, and others give we bass-heads a lot of can't miss choices. For example, I couldn't be happier with my FV18s. They are fun, fun, fun!
 
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In reference to the the bolded part of your post, this piece, written by Bill Whitlock of Jensen Transformers, shows the circuitry for the XLR-RCA connection noted above. See figure 2.1. The piece also has a lot of good information on balanced connections. Mr. Whitlock is an expert in this field. You can often find his presentations on YouTube.

http://www.jhbrandt.net/wp-content/uploads/2014/11/Interconnection_of_Balanced_and-Unbalanced-Equipment.pdf

While an XLR to XLR connection would be best, a connection of an RCA output to XLR input using the set of cables noted in the first post, if that's all that is available, can be an improvement over RCA to RCA, as Mr. Whitlock notes.
On my statement, I was talking about fully differential in/outs (XLR - XLR). I can run 300 ft balanced cables (XLR - XLR) without any degradation on the signal. Using those adapters the cable becomes single ended (unbalanced) so after 50 ft you will get noise or interference.
 

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Very true gwsat. So many choices out there. Really is incredible time for subwoofers.

Just wish it was 2000-2008 time for avr and preamps. That's was their pinnacle of greatness. Imagine a marantz 7011 weighing 30lbs with 2v preouts in 2005. That would be a $399 avr. Lol

Something like a 70lb denon 5803 that has 18v Preouts. From 2005. Now if we could just put all the new sound fields and hdmi in our older receivers. :)
 

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when I buy my 2nd rhythmik to go along with my 15hp, I keep wondering if just to match it w/2nd 15hp...or get an F18 or get F25. I would like cosmetically to get a huge sub that would do double duty as a console table behind my loveseat.

size/dimensions are so important imo.

anyone think the larger models will play nice with my 15hp...or just get a 2nd 15hp which I would probably place as an end table either to loveseat or my couch...

edit my floorplan is pretty adjustable so dont take pic as gospel. and a new time consuming adjustment tool :)
 

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when I buy my 2nd rhythmik to go along with my 15hp, I keep wondering if just to match it w/2nd 15hp...or get an F18 or get F25. I would like cosmetically to get a huge sub that would do double duty as a console table behind my loveseat.

size/dimensions are so important imo.

anyone think the larger models will play nice with my 15hp...or just get a 2nd 15hp which I would probably place as an end table either to loveseat or my couch...

edit my floorplan is pretty adjustable so dont take pic as gospel.
@TulsaCoker has two mismatched SVS subs, one ported and one sealed, in his home theater. He EQed them with YPAO and an SPL meter and has been pleased with the results. They sound good to me too.
 

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@TulsaCoker has two mismatched SVS subs, one ported and one sealed, in his home theater. He EQed them with YPAO and an SPL meter and has been pleased with the results. They sound good to me too.
yea, i spent a month or so tweaking positioning my velodyne subs to play nice with rhythmik...its possible, but was a pain in the ass.

thank you for comment/opinion/fact.
 

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