Download THX and Atmos Trailers: www.hometheaterfanatics.com

Greetings from Serbia. Siegfrid Linkwitz once said that bass reflex is fundamentally wrong way of making loudspeakers. He was absolutely right.

@JilesMcCoy

4 ай бұрын

Thanks for watching!

@clearbrain

6 күн бұрын

I agree totally ❤❤

I agree, I purchased a pair of NHT 2.3a speakers that are acoustically suspended in 1998. And I still love there sound!

@HSmith-xp6ik

3 жыл бұрын

Hello I hve four vt 1.2s tower i'm using for front l & r and two for surrounds. I use two super ones as heights. what do you mean acoustically suspended in 1998? Your 2.3s sound better than what I have, do you think I need to upgrade? I've these speakers for a whilethey still sound pretty good.

@cruzingrsx4484

3 жыл бұрын

@@HSmith-xp6ik NHT in my opinion make very nice sounding speakers. NHT has stopped making the 2.3a’s I own a long time ago. Acoustically suspended just means a completely sealed box. 1998 is the year I purchased these speakers and yes I have them for a long time. I did replace the silk dome tweeter with an OEM once in that time frame. There are a lot of great speaker in 2021 in different budget’s, and purposes (movies, music or both) and there’s a lot of information available in this day an age. Enjoy you NHT VT 1.2 speakers

@swinde

3 жыл бұрын

@@cruzingrsx4484 Actually, acoustic suspension means more than just an air tight box. When AR came out with the AR-1W they explained that the design includes a rather soft suspension of the woofer cone along with a specific volume of air in a sealed box. The air in the box served as the restoring force for the cone rather than stiff spiders and surround attachments. The air would be a more linier restoring force. An air tight box is an infinite baffle, but really requires rather large cabinets and the ideal infinite baffle would be open backed and have a mounting "baffle" that is larger than any bass wavelengths that you expect to reproduce.

Explained in detail.. thank you guys! 😎👍

@JilesMcCoy

Жыл бұрын

You are welcome!

The much shallower rate of attenuation of sealed coupled with the fact that the output below vent tuning/f3 doesn't become out-of-phase with the signal above tuning (causing even further attention from the onset of cancellations with frequencies above vent tuning), it explains why the "additional output" of vented designs over sealed doesn't always materialize in the real world. Also, Acoustic Suspension is actually a very specific sub-variant of sealed box tuning. With AS, the driver mass, suspension compliance, and enclosure volume are kept in very specific and tight ratios. One cannot just seal a box and place a driver with compatible T+S parameters in there and have an "Acoustic Suspension" system. Fantastic clip. Really great stuff. I would give it two up votes if i could.

@JilesMcCoy

3 жыл бұрын

Thanks! I can't wait till I get a pair of these to review! I really like the look.

@DBravo29er

3 жыл бұрын

@@JilesMcCoy These KLH's are straight knockouts!! 😍😍

I built my speakers after much learning and went the way of accustom suspension. When listen to low sounds it is so clean. No flutter.

I'm on the fence on getting the NHT C3. A 3-way sealed bookshelf.

I enjoy immensely my sealed Bang Olufsen Beovox S70 after replacing capacitors and strengthening a bit the woofer's membrane .

@JilesMcCoy

11 күн бұрын

That’s great!

Kloss' Baby Advent is not really sealed. The cabinet is - of course. However he made an opening at the back of the magnet motor that goes through the cone by a very fine silk screen cone cover. Somehow he wanted to cancel the bass in order to compensate the thin cabinet and lower the power requirement to drive the speaker.

When crossing to subs should what is the best combo?? Ported speaker to ported sub, sealed speaker to sealed sub, ported to sealed and vice versa...?

@JilesMcCoy

3 жыл бұрын

I would cross to a sub sure. You can do either, but I like sealed.

How ironic. I just stumbled across your video (thanks youtube algorithm!). I built my own 12" 3 way acoustic suspension speakers in the '60's and was actually an Acoustic Research rep back in the late '70's. So I am very familiar with acoustic suspension design. I frequent a lot of audiophile youtubers. With the KLH5 return a lot of them have covered it and touch on acoustic suspension compared to the typical ported designs most common. But this is the first time I have heard anyone go into the level of detail and especially promoting the technical advantages of that design. And it turns out to be a home theater rather than 2 channel audiophile site? GREAT JOB!

@JilesMcCoy

3 жыл бұрын

We are modern audiophiles over here! Glad you liked the video. Share with your buddies! I hope to have shot at reviewing the Model 5 one day too!

@glenncurry3041

3 жыл бұрын

@@JilesMcCoy I caught the longer complete interview and found out you were interviewing the engineer from KLH. Being the first time I stumbled across your channel I thought you were both just partners here. Makes a lot more sense now that I know who was saying all of that.

@dwaynepiper3261

4 ай бұрын

@@JilesMcCoyModern audiophiles are the best kind :)

i have Technics SB-F1, 2 and 3 for monitors and pioneer CS-A700 as mains.... once you try acustic suspension you can't go back

@JilesMcCoy

3 жыл бұрын

True!

Is an acoustic suspension woofer designed differently than a bass reflex woofer and if yes, in what way are they different?

@JilesMcCoy

2 жыл бұрын

Well, certain woofers work better in particular boxes.

I have had AR-3a speakers since 1970 and love them. Can you name the brands that currently use true acoustic suspension among current speaker models?

@JilesMcCoy

3 жыл бұрын

I am sure there are many many.

@meta5291

2 жыл бұрын

Near impossible to find acoustic suspension speakers. I hope the Chinese can be persuaded that these sound better, then we'll have a real deluge of sealed speakers in every price range.

@armanddimeo6575

Жыл бұрын

In addition to KLH, the two that come to mind are NHT and Magico. Magico is very high end and very pricey and out of reach of most people. NHT speakers are reasonably priced and are generally sold on the internet only. NHT was founded by a former Acoustic Research engineer and comes from the same lineage as KLH. I have two pairs of NHT speakers (C3s and Super Ones) and love them. I have had ported and passive radiator speakers in the past and believe that acoustic suspension is inherently superior.

@ericschmitz357

8 ай бұрын

First time I heard ARa speakers was in 1970 and they sounded fantastic...almost electrostatic in the mid and highs and clean/ defined/ coherent in the bass.

Ported vs Sealed (Acoustic Suspension) is night and day to my ears. When I went from a ported sub to a sealed sub, the difference was obvious. Then I picked up the KLH M5, same experience, night and day difference over a ported cabinet. The bass out of the Model 5 is fast and tight, incredibly musical, and at this point, I see no reason to even add one of my SB3000's into the mix. The bass is that good on the Model 5.

Id really like to build a theater system with both model 5s and model 3s for 4 channels, then klh Kendall bookshelves for surround, thats like my dream system...would it work????

@JilesMcCoy

3 ай бұрын

I don’t see why not! Seems cool!

Why I’m so excited for the Atlantic Tech 8600 speakers 🔊

@JilesMcCoy

3 жыл бұрын

Filming those tomorrow.

@Novilicious

3 жыл бұрын

@@JilesMcCoy yasssssssss!

How do you address the claim that higher efficiency speakers yield more micro detail?

@JilesMcCoy

3 жыл бұрын

I have no clue if that is true or not. I would need to sit down with a pair of speakers and listen for differences.

@glenncurry3041

3 жыл бұрын

By listening to a really good analog system with low efficiency speakers. A large percent of systems with low efficiency speakers just lack an amp capable of driving them properly.

I've always loved bass reflex for movies, acoustic suspension for both music and movies, albeit more for music. I think ports are a double edged sword in the sense that if it's done well considering airflow dynamics and such, it'll pay dividends, but will probably deter low-end fidelity if not much thought is given.

Is there a difference between a séaled design vs a ported design with stuffed ports?

@JilesMcCoy

3 жыл бұрын

Well, if you stuff the ports it is sealed. But was it designed to have the ports stuffed? Many ported boxes are not designed to have the ports blocked and perform poorly that way.

@glenncurry3041

3 жыл бұрын

A ported cabinet allows the woofer cone to move more easily because the woofer lacks the "acoustic suspension" to the cone that a sealed cabinet's internal air pressure does. So the surround on a ported cabinet woofer is stronger and more restrictive. Plugging the ports totally changes the loading and travel of the woofer cone in ways it was never designed for.

@swinde

2 жыл бұрын

The Dynaco A25 speakers had a modified port which offered some resistance to air movement without being sealed. They were manufactured in Denmark and have had very good reviews. My guess is they fit somewhat between acoustic suspension and bass reflex.

I still love my New Large Advents...

@JilesMcCoy

3 жыл бұрын

Awesome!

@Old_Sailor85

2 жыл бұрын

Try replacing the tweeter with a waveguide. See Econowave speakers. Take your Advents to a whole new level.

Would plugging ports tightly produce a sealed box? Would it harm the woofer?

@JilesMcCoy

Жыл бұрын

Yes, and probably not. But it might not perform well.

@johndough8115

10 ай бұрын

I tried sealing a Ported house speaker... and it didnt sound right. I believe the drivers have to be specifically designed for Acoustic Suspension.

But why most flapship loudspeaker use bass reflex?

@JilesMcCoy

3 жыл бұрын

Thats not true across the board. As an example look at Focal. They use bass reflex in their lower lines but the top of the line Utopias are sealed. This is pretty common.

Jiles what is your favorite Acoustic Suspension speaker?

@JilesMcCoy

11 ай бұрын

You want to make me choose amongst my children???!?!? What kind of speaker?

@rancosteel

11 ай бұрын

@@JilesMcCoy Yes brand and model.

@JilesMcCoy

11 ай бұрын

Thats really an impossible choice. There are so many. A daily driver for me is the Starke Sound IC-H3. Absolutely phenomenal speaker. @@rancosteel

@JilesMcCoy

11 ай бұрын

If you are talking subwoofers there are lots there too. Not sure exactly what you are looking for though. I use Perlisten D15s which is sealed. Its really nice.

@rancosteel

11 ай бұрын

@@JilesMcCoy Yikes. At $3,740.00 USD each they better be. My first job at 17 in 1978 was working at a loudspeaker manufacturer that made only acoustic suspension systems. Great video thanks.

Sealed is definitely better than ported but to my ears open baffle is the only way to go. I don't use ported for anything and only use sealed when absolutely necessary such as surround speakers. I would never use any box speaker, sealed or otherwise for 2-ch critical listening, there are simply too many fundamental flaws.

@JilesMcCoy

3 жыл бұрын

Your theater build looks outstanding! I'd love to hear more about it. Do you have details anywhere?

@mfkhometheater7742

3 жыл бұрын

@@JilesMcCoy I haven't really posted a lot of detail on my web site so just a basic rundown... Room dimensions 21'x28'x11'. Front and middle rows will have five seats each, back row four seats. I've already ordered Valencia Tuscany in Navy blue for these... that knocked a dent in the budget! I have an Anthem AVM60 processor to start with, it will get upgraded to something eventually. I'm looking at the Epson 6050 projector as a cheaper alternative to the JVC's and Sony's I looked at earlier but I still might spring for one of those. The screen will be DIY around 180" diagonal 2.35:1, using AT material, still looking, trying to decide between perforated or woven. All speakers will be DIY, the left/right approximately 9.5' tall dipole CBT arrays. Each will have fourteen Dayton Audio AMT-Pro4 air motion transformers plus fifty six Dayton Reference 5" truncated frame drivers. The center will be a horizontal dipole CBT array that is partially physically curved and partially acoustically curved using DSP delays. The center will contain twenty seven GRS 3.5" planer tweeters along with fifty four Dayton Reference 3" drivers. The center speaker itself will operate from 300 Hz up while 300 Hz down will be summed back into the left/right main speakers. This should extend the directivity control beyond the capability of the 5.5' wide CBT. About 30 Hz to 80 Hz will be floor to ceiling dipole H-frame woofers each using a low cost 15" woofer from Newark (formerly MCM) eight woofers per column. The choice of this woofer is based on performance, not on its incredibly low price of just over $20/ea. Below 30 Hz will be six to eight Dayton Ultimax 18" drivers IB mounted in the attic. Aux woofers probably using the aforementioned MCM 15" woofers will be IB attic mounted as needed to smooth out the response in the room. These will be in left/right pairs with each pair having its own DSP channel. The left/right mains will each be powered by two Emotiva BasX-700 7-ch amplifiers, the center will be powered by two BasX-700 and one BasX-500 with one channel unused. I'm looking at ICE modules for powering the woofers. I have two Emotiva BasX A5175 5-ch amplifiers for powering surrounds and atmos. Eight miniDSP 2x4HD's will handle the DSP for the LCR, dipole woofers, IB subwoofers, and Aux woofers for bass uniformity. If you are not familiar with CBT arrays, here are a couple articles specifically about dipole CBT... Constant Directivity Circular-Arc Arrays of Dipole Elements www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwin0KmKktHwAhVBpZ4KHUOFCVcQFjABegQIAxAD&url=https%3A%2F%2Ffaculty.tru.ca%2Frtaylor%2Fpublications%2Fcbt_dipole.pdf&usg=AOvVaw3nOg-c_bt0PVjSAnrU_4vt Implementation of a Dipole Constant Directivity Circular-Arc Array www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwin0KmKktHwAhVBpZ4KHUOFCVcQFjACegQIAhAD&url=https%3A%2F%2Ffaculty.tru.ca%2Frtaylor%2Fpublications%2Fdipole_cbt_implementation.pdf&usg=AOvVaw3K_smFJF4h5UVe0ncydWVc

@glenncurry3041

3 жыл бұрын

Love my Maggie 1.7i!

By far the best Bass I had the chance to experience was from TL's. Even Sealed isobaric cannot equal a good TL system.

@JilesMcCoy

6 ай бұрын

Nice!

I appreciate the content in this discussion and appreciate the validity of what you're saying but one point that seems valid to me was not made in your discussion. In terms of the quality of bass output it has always seemed to me that the passive radiator tuned enclosures tread a line between sealed systems and bass reflex, providing better efficiency than sealed box systems and better linearity and woofer control than a pure port tuned bass reflex. In other words a PR system is the best of both worlds with fewer negatives. Do you think this is an accurate view and if not why not?

@JilesMcCoy

4 ай бұрын

I think of a PR system as the best version of the bass reflex design (over ported). But it is still bass reflex so it will shift phase and unload under port tuning.

@thomaswomack3888

4 ай бұрын

@@JilesMcCoy Has anyone ever quantified what you give up in efficiency by using a sealed box as opposed to bass reflex? I'd be very curious to know what the average loss is with a sealed box

@JilesMcCoy

4 ай бұрын

@@thomaswomack3888 I am sure that someone has done that math. But there is a point where sealed produces more down low. I always say if you are chasing DBs go ported, but if you arent and have enough then you can choose what you like.

it's not the tech in itself , it is , ..how it's implemented, to say that infinity baffle is superior to bass refflex or otherwise, is missing the point, there are valuable aproaches to each technology , in 35 years of dealing with both technologies,...as also quarter wave , transmission line, slot reflex ,horn charged,....etc..etc..etc... i have heard both good and bad to very bad implementation of every technology

The problem isnt the Recording these days. The problem today, is that they Compress all of the music to Hell, at the Studio. It all sound Flat, distorted, and lifeless. This has been happening since the 90s. This was the result of the ECO-Radicals... trying to save a few watts of power, per household. They kept increasing the Compression levels, each and every year since the 90s. The only place that they dont seem to compress audio, is on DVD / Bluray Movies. But good luck finding a modern CD that has the Dynamics of something put out in the 80s. Also, from my ears, it seems that Apples Itunes was compressing all of their audio.. and then upscaling the files to a higher bit rate... to make the file sizes larger... to make it SEEM like you were getting higher quality music. When in fact, its much lower quality / dynamics, than any old MP3 files that you downloaded on old Filesharing applications, ages ago. I never used Itunes.. but as a PC Tech.. I had dealt with transferring peoples files.. and so I was able to sample a lot of these files for myself. In fact, the whole reason why they went from Sealed speakers, to Ported... is because of the ECO Radicals. Sealed speakers require more power to drive them. In addition, ported speakers were cheaper and easier to build. They also started using thinner wood walls, to reduce weigh (shipping based fuel concerns + reduced shipping costs). Since the drivers didnt have to fight air pressures.. they could also use lower magnet strength, and weaker coils. This resulted in speakers that could play loud.. but... they are prone to a lot of distortions. You would never know what you were missing... until hearing an Audiophile grade sealed speaker. Then you want to almost Cry, for all of the years you missed how good these songs SHOULD have sounded... but you were Denies, due to the "Fun Police".

@JilesMcCoy

10 ай бұрын

I do love my sealed too!

Gershman Studio ii, sealed and uncompromised

they are ... just bought GERSCHMAN STUDIO II V2 monitors !

@JilesMcCoy

3 жыл бұрын

Congrats!

Way too short! Can i just plug the ports?

@FSXgta

3 жыл бұрын

Ported speakers generally has more airspace than sealed, so it wouldn't be ideal

@mfkhometheater7742

3 жыл бұрын

It depends on the design of the ported speaker, if it never should have been ported to start with, (true of many designs) then yes. The original JBL L-100 could be greatly improved by stuffing its port with fiber to make it more of a resistive vent. If you want to experiment, try stuffing some quilt batting material in the port and see if you like the sound better.

@TylerStout

3 жыл бұрын

A lot of speakers will come with plugs if they are designed to be plugged. If not it's a YMMV sort of deal.

@ChannelBri

3 жыл бұрын

REVEL F35, surprised they didn't come.with port.plugs

@crazymetallian

3 жыл бұрын

no. there is something that makes acustic suspension speakers way more expensive... this is quality, for an acoutic suspension you REALLY need a good box, very strong, better yet, use aluminum, solid concrete, if its made of wood to cheap out then it needs to be really heavy, really thick you can't use MDF, also you need a lot of acustic isolators in short bass reflex is done to cheap out (some models and technologies are better than others, but is an easy way to cheap out)

I had a Wharfedale speaker I just mailed back, it was acclaimed as balanced, smooth, and warm.. well it was all these, but Warm is not what I need in a home theater setup... like most have.. the dialogue on TV news sounds like, hmm....hmm. hmm....hmmm...... it is not listenable to me... music sounds good but the distortion on low bass is not acceptable on bass reflex.. I would think manufacturers should wake up to the coffee and stop pushing bass reflex!

@JilesMcCoy

11 ай бұрын

What speakers did you go with?

Why is the title sarcastically written?

@JilesMcCoy

10 ай бұрын

You mean YOU don't know?

@clearbrain

10 ай бұрын

@@JilesMcCoy I wanted to know why it's written (Sorry ported) I don't understand the language actually

@JilesMcCoy

10 ай бұрын

@@clearbrain It’s not sarcastically written… it’s simply a title.

@clearbrain

10 ай бұрын

@@JilesMcCoy oh...now I see.. You are basically saying (sorry) to ported ... meaning - Ported stuff, sorry you are not recommended... Ok ... Funny how language drives us to think in different ways...,😊😊😊😊

wwwwwweeeeeeeeeeeee im #1 !!! Good video!!!

With speaker design there's always a compromise. If you design your bass reflex correctly it can be low on distribution

@JilesMcCoy

8 ай бұрын

I agree. Bass reflex can go low if designed for that. Generally though, sealed is where its at for super low.

@BostonMike68

8 ай бұрын

@@JilesMcCoy I have a Dayton 12 " reference high exersion sub and I was going to make it ported but I changed my mind and going sealed because it's a low distortion and a good driver for music and that's what I manly want it for to let my other speakers focus more on mid bass even though I built my speakers with 10" Dayton Reference woofers and they really don't need a sub for music but I still want one 😂. That's why I was looking at the video. Thanks

@JilesMcCoy

8 ай бұрын

@@BostonMike68 awesome!

To say re recordings have got better while there is a huge segment of garbage recordings nowadays

@JilesMcCoy

4 ай бұрын

Thanks for watching!

Are these guys being sarcastic?

@JilesMcCoy

3 жыл бұрын

Nope

Ok I grew up in the 80s and experienced the best music scene that has ever or will ever exist again. You're actually going to say music is getting better and better with a straight face.. Are you kidding me??? The kids these days are far too lazy and uncoordinated to actually play musical instruments. Most of the time you have a vocalist (and I use that word lightly) singing to downloaded and sampled music created on a fucking machine. Hardly anyone in the music industry in 2023 plays a musical instrument of any kind. The talent and passion for creating good music died like 10 to 15 years ago! In 2023 if you are putting a nice sound system together you will most likely be playing the real music of the past on it not the talentless garbage music of today.

@JilesMcCoy

Жыл бұрын

There is plenty of great music today. Plenty of junk too. But it’s out there.

@dammdaniel9953

2 ай бұрын

Absolutely today's music are so garbage everything is electronic made artificial no real human touch even the vocal artist is auto tuned .