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HDI HDI exam contents
testing on the HDI-1200P turned into carried out with the microphone facing the woofer at a 1-meter distance and then scaled lower back to 2-meters in their graphs through subtracting 6dB in output. The temperature changed into recorded at 65F degrees with eighty% humidity. The subwoofer’s gain turned into set to maximum, phase was set to 0, and the low circulate filters were left off.
The above graphs exhibit the measured frequency responses for the JBL HDI-1200P subwoofer. here they see a reasonably neutral response besides the fact that children now not rather absolute perfection. JBL’s spec for the response as “28Hz - 150Hz (-6dB)” is correct. The anechoic range of this sub is relatively an awful lot 30Hz to 250Hz, and the in-room response should still be able to extend that right down to 25Hz or so in commonplace home room sizes. The ports appear to be tuned to around 30Hz, so here is no longer the deepest-digging subwoofer around, but it truly is what could be expected of a small ported enclosure. This extension should be enough to catch ninety nine% of recorded tune bass content material and 90% of recorded movie bass content material. besides the fact that children, there are some videos with extraordinarily deep bass that might lose whatever with a 30Hz roll-off. it's exceptional to see some real upper bass extension, and these subs may simply be crossed over as high as 200Hz if the consumer desired. The advantages of this are that a multi-sub system can address room modes above general crossover frequencies with out being concerned about localization. The subs are additionally more likely to bring a stronger dynamic latitude than most audio system are in a position during this mid-bass band as smartly. This prolonged higher bass range will also be positive, so it's great to look right here, and unexpected seeing that many of these lengthy-throw, small-cone drivers are usually on the heavier side that could simply kill the response above 100Hz.
The above CEA-2010 measurements are brief-time period bursts that show the subwoofer’s clean peak SPL earlier than heavy distortion sets in. Their measurements have been referenced to 2-meter RMS, which is 9dB down from the regular requirement for the measurements to be shown at 1-meter peak. although most publicly attainable CEA-2010 measurements are shown at 2-meter RMS, so they adopted that conference. The HDI-1200P become in a position to flow a 25Hz verify tone, despite the fact not with ease considering that frequency lay beneath the port tuning frequency. because the frequency response measurements exhibit, this sub is constructed for 30hz and above. 50Hz and 63Hz flip in an peculiarly powerful showing here, and that latitude serve as the foundation for the simple frequency for a good deal of tune, so the HDI-1200P should still be capable of provide a really solid basis for track even at loud listening degrees. The response does taper off a little at 80Hz and above, and that could be because of the load of the moving mass or probably induction chipping away at higher bass frequencies. The 31Hz tone burst became amp confined, and frequencies above that could not be pushed into any big distortion tiers. The sub is especially clear above 30Hz, and it is obvious that non-linear distortion was a parameter that JBL took severely of their efficiency aims. whereas the HDI-1200P doesn’t technically qualify for their Bassaholics ‘Medium’ room dimension score given that it misses the output requirement at 25Hz, i will be able to provide it a ‘Medium’ anyway because it considerably exceeds the requirements for the ‘Medium’ room dimension ranking at 31.5Hz and above.
checking out for long-term output compression became done through first conducting a 20-second sweep tone where 50Hz hit 90 dB with the subwoofer 2 meters from the microphone. They then habits extra 20-second sweeps by using elevating the gain with the aid of 5dB except no more output may well be wrung out of the subwoofer. These tests demonstrate us the lengthy-time period continual headroom that the subwoofer is in a position to. The HDI-1200P holds its response form relatively well out past the 100dB level, and then what appears to be a average induction-related height pops up headquartered around 50hz. The aluminum shorting ring isn’t quite ample to negate induction outcomes completely, but that is not a shock given the tremendous 3” voice coil with such a protracted throw. It’s a lot of copper with a lot of action beneath loads of magnet. There are certainly much less expensive subwoofers that do offer greater output, however here's usual a respectable degree of output for a small ported 12”.
The above graphs show the corresponding total harmonic distortion to the lengthy-term output graphs. virtually, they depict how linear the subwoofer is still for the corresponding force stage viewed in the lengthy-term sweeps. The quantity being measured is how tons of the subwoofer’s output is distortion and is proven here as a percentage. As they noticed within the burst measurements, the HDI-1200P is awfully satisfied at 30Hz and above but isn’t truly constructed for the rest beneath 30hz. it'll be saved in mind that while distortion takes off like a rocket below 30Hz, output falls like a rock below 30Hz, so any distorted output may be very a ways down in degree relative to clear output. Take a close seem to be on the response shape seen here, and it is pretty much an inverse of the frequency response form. So don’t think that the sub will make every kind of distress noises if it is pushed to play deep bass seeing that it vastly reduces all output beneath 30Hz. It could make some audible distortion if best fed sub-30Hz sinewave look at various tones, nevertheless it wouldn’t be loud in degree, and in true-world use, any distorted output can be masked via the an awful lot louder signal content above 30Hz.
The above graphs depict measurements of the constituent harmonics from the long-term output sweeps and are what the entire harmonic distortion measurements are composed of for the 2nd and 3rd harmonics. These particular person harmonics can provide us a clue as to what might be the reason behind some quirk or non-linearity. they are only showing the 2nd and third right here because they more or much less reflect the greater even-order and odd-order behaviors, youngsters better-order harmonics are typically a whole lot further down as a percentage of distortion compared to the second and third.
what's pleasing within the harmonic components of the HDI-1200P is that there are not any peculiar-order distortion items to talk of within its operational range of 30Hz and above. JBL’s ‘Symmetric box Design’ technology looks to be working extremely smartly! I don’t continuously are expecting a good deal of those types of advertising buzzwords, but the proof is in the pudding here. The exceptional component about this is that the odd-order harmonics are lots greater audible than even-order harmonics, primarily in tune content material, so what little distortion the HDI-1200P has is of the extra benevolent range. Even-order harmonic distortion can scarcely spoil over 5% which is what they also saw in burst trying out. here's a very clear subwoofer that cannot be pushed into any audible distortion in its meant operating latitude.
neighborhood extend is the size of how lots time it takes for particular person frequency bands of an input sign to be produced by way of the speaker. it will possibly point out that some frequency add-ons are establishing slower than others or are taking longer to decay. it's generally notion that 1.5 sound cycles are needed for group prolong to be audible at bass frequencies, besides the fact that children there is an argument that neighborhood lengthen should still remain beneath 20ms to be absolutely unnoticeable, however that is likely supposed for mid and upper bass frequencies. Ported subs ought to necessarily exceed at the least one cycle of group delay due to the ported design, but the HDI-1200P restricts its community lengthen to as little as possible. Port tuning frequencies simply above one cycle and then without delay returned down backyard of port-resonance. The neighborhood prolong is awfully unlikely to be anywhere close audibility because it occurs at such a deep frequency. with the aid of 40Hz, it's beneath 20ms which is one-fiftieth of a 2d, so the time area behavior in track stages is fairly good. There shouldn’t be any audible bloat or overhang at all from the HDI-1200P, and people who hear that from a equipment with an HDI-1200P subwoofer are certainly suffering from room acoustics issues or calibration issues since it isn’t coming from the subwoofer itself.
I enjoyed spending time with the JBL HDI-1200P, and it turned into a treat to listen to what it might do with the movies and track that I used with it. it is a quality subwoofer, however absolutely should still be for $3k. $3k is some huge cash for a subwoofer that doesn’t in fact dig deeper than 30Hz or compresses its response shape above 110dB. The fundamental performance attributes aren’t bad, but there are subs of similar size that surpass its normal performance level for a decrease price aspect. What then is the purpose to buy the HDI-1200P? The intent is appearance and construct satisfactory. This factor is constructed like a tank and has one of the most top-rated real-timber veneer I even have considered on a subwoofer. it's a sub that presents very decent performance and a beautiful appearance that other family dwellers can be unlikely to object to even in rooms with a nicer decor. It straddles the road between a luxurious merchandise and excessive-performance audio gear.
The JBL HDI-1200p Subwoofer eye-catching real timber Veneer
The ordinary element of the HDI-1200P is that here is a modestly sized sub that compliments the HDI loudspeaker sequence, which are relatively massive audio system for probably the most part. One would consider that the consumers of the HDI speakers could be able to accommodate a bigger sub than the 1200P, and that could permit JBL to get tremendously more suitable performance with the aid of both tuning the ports for deeper frequencies or getting more output from the better effectivity granted by way of higher enclosures. JBL as a substitute opted for a smaller form factor that makes it perfect for extra household members. I won't have guessed they needed to do that, however I think JBL’s market research group knows their client base more suitable than I do. despite the fact, i'm not right here to evaluate JBL’s strategy however somewhat the individual product under evaluation, so they should take it on its own phrases.
on its own terms, there is lots to love right here. whereas the HDI-1200P doesn’t dig right down to extremely deep bass frequencies, it boasts audiophile-stage fidelity above 30hz with superlative handle of nonlinear distortion as well as very good time-domain conduct. Its dynamic range level is first rate although now not rather wonderful. The inclusion of XLR inputs and a parametric EQ are niceties that tick checkboxes that you would are expecting to peer in a sub of this pricing. It’s a chic-searching sub that isn’t very colossal and doesn’t inn to the commonplace gloss black conclude for a high-conclusion appearance (although gloss black is accessible to people that desire that). And it has the type of solidity that could be expected of great furnishings. It’s a dear subwoofer, however does fill a spot; extraordinary bass from a small sub with excessive-end timber veneer and build nice. If that is your criteria, it gained’t be convenient to discover a less expensive choice.
The scoring under is based on each piece of machine doing the responsibility it is designed for. The numbers are weighed closely with respect to the individual can charge of every unit, as a consequence giving a score roughly equal to:
Audioholics.com word: The ratings indicated beneath are in line with subjective listening and objective testing of the product in query. The rating scale is in response to performance/cost ratio. in case you word more suitable performing products in future stories which have decrease numbers in definite areas, be conscious that the value element is definitely the culprit. other Audioholics reviewers can also fee items totally according to efficiency, and each reviewer has his/her personal device for ratings.
Prolix posts on October 09, 2021 15:27
I even have a Revel b112, which I gather is relatively lots a sealed version of the hdi-1200p. once I run audyssey its raw in-room response is flat via 20hz in my lounge with 10' ceilings. It does not have the impact of the twin monolith 12s I actually have within the basement, but it's enough to blow the minds of usual humans, and it doesn't appear out of vicinity. i've been very chuffed with it for a number of years.
TLS man posts on October 08, 2021 00:03
Eppie, submit: 1508969, member: 94526Thank you for the graphs and photographs. Does the depth of the container ingredient heavily in the calculations or is it essentially the size of the TL that yields the preferred consequences? i used to be questioning if it would be purposeful to are attempting and design an enclosure below 11" deep or does that result in a width and height that could no longer be purposeful? Sorry, however I have not had the possibility to play with the TL design application yet.The pipe quantity Vp is regarding the VAS of the driving force. The better the VAS the greater the pipe volume must be. figuring out this was George Augspurger's amazing contribution to TL design.
Eppie posts on October 07, 2021 23:fifty three
TLS man, post: 1508936, member: 29650Here is the response of slim TL sub using the ten" Dayton sub driver….thanks for the graphs and photographs. Does the depth of the field component heavily within the calculations or is it essentially the length of the TL that yields the preferred effects? i was wondering if it will be useful to are trying and design an enclosure lower than 11" deep or does that result in a width and peak that could now not be practical? Sorry, however I have not had the probability to play with the TL design software yet.
TLS guy posts on October 07, 2021 18:33
Eppie, publish: 1508900, member: 94526Leon speakers has been the use of the approach of designing slim cabinets, that specialize in low profile aspect mounts and sound bars and offer slim subs (not TL) however the specs record them as best going all the way down to 30Hz (in-wall) and 28Hz (slim construct). Paradigm additionally sells in-partitions however seem to be reluctant to post full specs. They simplest state the the low freq. extension is 19Hz-17Hz, but lack of appropriate specs looks rather telling. JL Audio appear to have a greater unique design approach, but even those tall Fathom subs are best rated all the way down to 25Hz -3dB.
I imagine that any slim sub will face challenges due to constrained excursion, exceptionally considering lengthy day trip looks to be the buzz be aware with subs. I think you have got your work reduce out for you. now they have seen what small drivers can do within the SVS 3000 Mirco and KEF Kube, which looks to indicate that larger diameter drivers with shallow baskets can be the way to go. How deep is the in-wall for your tremendous room? Do you think that there's a TL design that might work with a relatively shallow cabinet? i might assume that a TL design would require some minimum depth for the physics to still work. What a couple of driver array the usage of distinctive smaller subs to boost surface enviornment but in the reduction of depth, or would that just create a bloody mess?here is the response of slim TL sub the use of the ten“ Dayton sub driver.
here's the in room response of the three entrance speakers and sub, at all seating positions and the a ways side of the dinning room table. The green line is taken over the Kitchen cook proper.
this is the TL
it is eleven” deep, 5' lengthy and 25“ high.
here's the room.
notice there is an open stairway.
That one driver fills the area very evenly, due to what organ builders seek advice from the encompassing phenomenon of pipes.
The sub is very productive and vigour is reduced 5 db beneath the different speakers or it overpowers them.
Cone day trip is not an issue as the force in the pipe at the driver is excessive and pipes handle the driver like a vice. In my studio i use a total of 4 10” SEAS Excel drivers within the correct and left bass TLS. I even have in no way bottomed the drivers regardless of vibrating the room, even at modest extent.
The best thing of all is that the bass first-rate is an awful lot bigger than from a typical ported or sealed sub. it's enormously functional. Even that lone 10" driver can permit an organ to fill that house with authority.
There is not any doubt in any way in my mind that TL subs, produce essentially the most simple and natural bass of another design.
Mark E. long posts on October 07, 2021 18:02
Verdinut, put up: 1508925, member: 80194No, you can not get a good infrasonic LF response from a little container, length. you will only get efficient subwoofer response under 20 Hz with a ported design.
Verdinut, post: 1508925, member: 80194No, you cannot get a good infrasonic LF response from a bit container, period. you will simplest get productive subwoofer response below 20 Hz with a ported design.Iam reasonably aware about that my remark changed into a ment in jest .
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