Eminence PSD High Frequency 1″ Driver, 80 Watts at 8 Ohms. Developed for totally loaded Eminence cabinets, or as upgrades to an existing device. Eminence PSD 1 bolt on high frequency driver handles a powerful 80 watts AES at kHz. Eminence:: 1 Inch Bolt On:: Eminence PSD (Bolt-on) 1 inch Throat 80W Compression Driver 8 Ohm:: Eminence PSD (Bolt-on) 1 inch Throat 80W.
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Search Everywhere Threads This forum This thread. Everywhere Threads This forum This thread. High Frequency Compression Driver Evaluation.
Finally, thanks to Bonnie T, love of my life who put up with my obsessions eminenfe the last month in particular, and the last four years in general. This HF compression driver evaluation was undertaken for three basic reasons: Advances in materials and design has led to higher power handling which may correspond to additional available ejinence and lower distortion.
Most of my sound work presently is in the dry high desert of New Mexico, HF air losses in hot summer temperatures require far more acoustic power to overcome those losses compared to similar heat at high humidity. HF air losses are in addition to the inverse distance 6 dB per doubling of distance. To achieve the same HF response at feet in the desert would requires a Drivers with more efficient, extended HF output would require eminnece compensating boost.
In the past two decades, LF driver technology has made large advances in linear excursion capability and power handling, resulting in more clean LF output per driver, although requiring more power to achieve that goal. Thiele -Small parameters for cone transducers make comparison of cone speakers psd002 easy, allow allowing reasonably reliable predictions of response in a particular cabinet alignment.
Eminence PSD Speaker Driver With Horn P17 | eBay
HF compression driver manufacturers do not publish TS parameters, at best one gets power, Fs resonant frequency diaphragm size and composition, exit diameter and response on a specific horn or plane wave tube, sometimes with harmonic distortion eminennce derived from a single frequency sweep at a small fraction of rated power.
This makes comparison of HF compression drivers between different manufacturers difficult in pd2002 than very fundamental respects. Having heard dozens of different HF drivers on dozens of different horns in different venues ranging from home theaters to arenas, with different arrays driven with various playback material and mixes by different engineers mixing different bands through different consoles, processing, and amplification, about the only conclusion drawn were various HF drivers can sound quite good or lousy.
A single DH1A had more extended, clean response than the pair of JBLs, at a considerable weight, size, and cost advantage, both in reduction of driver cost and eminenec of a crossover point and amp channels.
I designed a series of tests that involves elimination of as many variables described above to determine how a variety of drivers compare to each other at different drive levels, all driven with the same program material through the same electronics chain. Program consisted of both dual sine wave tones of the same musical interval at different frequencies, and a 30 second music excerpt.
The results of the tests were recorded and normalized for level and ppsd2002 available for download. To be continued next post. Each driver also used a specific delay compensation to align it with the LF track, slightly different delay and EQ were required for the Hz alignment. The process was akin to aligning a dozen different PA systems, no small feat in itself. This is hardly evident with the low track and HF horn mixed together, but obvious when the HF horn recording is listened to alone as it is in these recordings.
The actual SPL and power levels for the recordings are: I suggest downloading “DRPAHiOutOnly” the high output of the crossover used for testing the HF driversfirst as a comparison to hear what the high end of the song sounds like before being recorded from the output of the HF drivers.
All the drivers tested are nominally rated as 16 ohm. Sorry for the run on mess, tabs and more than single spaces in a line vanish after editing.
The narrow horn results in an pad2002 axis sensitivity around 6 dB more than most typical 90 degree horns, the 2 meter results would be similar to one meter results on some horns. Care was taken to insure a smooth transition between driver, adapter and horns, requiring a fair amount of drilling, filing and cursing those that made poorly aligned adapters and drivers that have unique bolt patterns.
The low frequency ripple is less than the unit to unit driver frequency response variance. The larger diaphragms provide more output with less distortion.
The BMS drivers are only capable of low distortion output with a Hz crossover frequency at a level lower than one watt.
The inexpensive PSD was a surprise, with 6 dB more power, it hit The distortion levels above do not include the minimal contributions of upper harmonics past the second, and are psdd2002 to the nearest whole number above the actual 2ndHD. Anyone willing to crunch the numbers further is welcome to look eminecne the RTA charts and derive finer resolution.
Having done so in the past pse2002 prove the point that 3rd, 4th etc. Odd order harmonics tend to sound worse at least from a western musical standpoint and there are differences in their levels between the drivers. The Jensen Hypex PA30 driver, lacking a phase plug, had an additional 16 odd harmonics occur. The larger diaphragm drivers have less odd order harmonic distortion at high volume. The Jensen Hypex PA30 driver, lacking a phase plug, but having an acoustic high pass filter, had less upper harmonic distortion.
The Eminence PSD has a rough response, and little output above This compression results in high throat SPL, at the upper power levels the drivers were tested at the non- linearity of air is responsible for a significant though undetermined percentage of the of distortion measured, that non- linear distortion is unavoidable in any compression driver design.
Examples of air non-linearity introduced by the mixing of two ultrasonic tones fminence dB SPL are available in posts of: What are benefits of adding HF driver 7khz up? Considering the disparity between size, weight, diaphragm material, and design, the constraints and compromises inherent in each approach, once equalized for flat on-axis response there was surprisingly little difference in the end results of listening tests.
The dual ppsd2002 wave tests made hearing the differences between the drivers easiest, simply stated, the EV DH1A has more output available with less audible distortion than the other drivers.
Eminence PSD2002-16DIA Diaphragm
wminence The BMS drivers have the smallest diaphragms of the drivers tested, whether this type of distortion is simply the result of the higher throat SPL required by the smaller diaphragm and exit diameter, or the driver design itself is an unanswered question. The upward masking from lower frequencies crossover masks those distortion effects to a large degree. All of the drivers tested showed many desirable characteristics and some defects. The Jensen Hypex is an antique, no longer available except on the used market.
For such a seemingly simple PA public address driver, it handled music surprisingly well. Having one sitting idle after use in a Leslie-style rotating speaker, it has sat idle for the last decade, and provided an interesting glimpse into past designs.
Having owned many of these drivers, have found unit to unit consistency to be quite poor, the driver tested was the best of four units I still own. The BMS is by far the highest output for size and weight of the drivers tested. It was not the most efficient driver, but was the flattest overall, and appears to handle the extra power it requires pds2002 the others with no problems. I was hoping to eminece a psd20002 weight replacement with sound quality exceeding the Electro-Voice DH1A, but in this series of tests it simply was the best sounding driver in every metric I can think of: It appears to me that although LF transducer technology has made some definite improvements in the past decades, HF driver design constraints have limited improvements to voice coil and diaphragm survivability and lighter weight.
Since as a professional in the audio feild you probably care far more about the performance of a driver when pushed hard, several examples will be posted. The musical recordings include the output of the high frequency horn only, a full range mix of the same files are available, recorded at the same and lower levels down to just under a watt: Hope you find the recordings interesting, they offer an insight in compression driver comparison as far as I know never undertaken before this study.
Eminence PSD 2002-8 High Frequency 1″ Driver 80 Watts at 8 Ohms
High Frequency Compression Driver Evaluation Eminene recordings, description of them is at the bottom of post 1. Michael Smithers Junior May 16, Jun 25, 8 18 Sydney, Australia eclipseaudio.
One question, and this eminencs directed more to Bennett. Granted distortion plots don’t necessarily relate to subjective listening tests but providing this data does help everyone make more informed choices.
Jeff Babcock Senior May 16, Jan 11, 3 18 Ontario, Canada jeffbabcock.
I was surprised to find how much distortion can be tolerated in the presence of the low frequency output. Jan 11, 10, 7 38 34 Wallingford, CT www.
Art Welter Senior May 16, Michael, Probably to keep spec sheets concise, although I don’t actually know. We don’t publish a great deal of the data we take for each product, all of this is of course available for the asking.
High Frequency Compression Driver Eminence PSD 80w RMS 8 Ohm Pair | eBay
I could not resist quoting this Art. An extensive discussion could be had about our hearing as it relates to distortion and the “masking” that LF signals can have on its perception. I recall first coming to this realization years ago when making some DSP presets for some DIY biamped cabs and discovering that the HF driver with the lowest distortion level didn’t actually end up being the driver I liked best in the cab once it was put into the context of a full range cab.
Greg Cameron Senior May 17, Jan 11, 0 So in addition to masking, our ears tend not to notice increasing amounts of distortion at higher frequencies. Art Welter Senior May 17, I’d also be very interested to follow a thread on masking in relation to drivers.
More recently coders have pushed compression ratios even high by incorporating spectral replication. That is, only lower frequencies are compressed and transmitted, and higher frequencies are synthesized by copying lower frequency regions up higher. While this may sound extreme, these techniques are backed by a lot of double blind listening tests with expert listeners. John Roberts Graduate Student May 17, Jan 12, 2, 3 38 MS www. One of my biggest complaints about a lot of audio codecs is how much distortion in the higher frequencies I actually do hear.
Granted it has much improved over the original mp3 format. But I do hear it even with AAC at the lower to mid bit rates. I suppose many folks don’t notice it but I do, namely on cymbals and high hats.