restorer-john
Grand Contributor
Yeah, right, OK.
200W continuous 'RMS' into any speaker is ridiculous, letalone some little pissant two way sh#tbag bookshelf speakers...
-
WANTED: Happy members who like to discuss audio and other topics related to our interest. Desire to learn and share knowledge of science required. There are many reviews of audio hardware and expert members to help answer your questions. Click here to have your audio equipment measured for free!
Dayton Audio OPAL1 speaker launches
- Thread starter RickS
- Start date
Yeah, right, OK.
200W continuous 'RMS' into any speaker is ridiculous, letalone some little pissant two way sh#tbag bookshelf speakers...
OP
- Thread Starter
- #102
yes, but does not state continuous.
Since you like traditional amplifiers so much, did you look at the AP report for their new A400 amp?
https://www.parts-express.com/Themes/Default/images/PDP/300-3848/A400 AudioPrecision Reports
My initial skim did not motivate me to run out and buy, but have no experience with AP reports.
restorer-john
Grand Contributor
They say this:
With an RMS power handling of 200 watts, they can achieve output capability beyond most bookshelf speakers of this size.
RMS is the calulation to determine the equivalent constant DC current that would disipate the same rated AC power. The key word is constant.
This is Scanspeaks (excerpt) of a document (technical note 02) on rated power handling with IEC 268-5 ratings:
Dayton is specifying RMS, which is the top one. 100Hrs with continuous signal...
Here is the back panel of my old Jamo 507a speakers.
Note the Long Term and Short Term as per IEC 268-5. They are a speaker with 2x165mm woofers, 2x100mm mids and a 25mm tweeter. A lot of VCs to get rid of heat and they don't even specify an RMS figure as we know it would be ~100W so.
The 200W RMS figure for this little PE two way is fantasy, no two ways about it.
With an RMS power handling of 200 watts, they can achieve output capability beyond most bookshelf speakers of this size.
RMS is the calulation to determine the equivalent constant DC current that would disipate the same rated AC power. The key word is constant.
This is Scanspeaks (excerpt) of a document (technical note 02) on rated power handling with IEC 268-5 ratings:
Dayton is specifying RMS, which is the top one. 100Hrs with continuous signal...
Here is the back panel of my old Jamo 507a speakers.
Note the Long Term and Short Term as per IEC 268-5. They are a speaker with 2x165mm woofers, 2x100mm mids and a 25mm tweeter. A lot of VCs to get rid of heat and they don't even specify an RMS figure as we know it would be ~100W so.
The 200W RMS figure for this little PE two way is fantasy, no two ways about it.
Penelinfi
Addicted to Fun and Learning
- Joined
- Apr 22, 2021
- Messages
- 727
- Likes
- 579
I'm happy that generally speakers get too loud before anything runs out of power. No stress about blowing up amps or drivers!
Also I wonder about supposed RMS rating for any speaker. The cooling ability of a speaker driver varies with frequency let alone its ability to even handle excursion at such ratings as frequency drops. As frequency increases cooling decreases due to less movement.
In other words, get speakers to handle the job with safety factor. You push it to the edge constantly it's going to fail sooner.
Also I wonder about supposed RMS rating for any speaker. The cooling ability of a speaker driver varies with frequency let alone its ability to even handle excursion at such ratings as frequency drops. As frequency increases cooling decreases due to less movement.
In other words, get speakers to handle the job with safety factor. You push it to the edge constantly it's going to fail sooner.
Very, very good sir!!
a4eaudio
Active Member
- Joined
- May 7, 2024
- Messages
- 173
- Likes
- 242
Dayton Audio and GRS are both Parts Express speakers. According to the PE site there are approx. 340 Dayton Audio or GRS speakers manufactured. I'm not saying you are wrong, but do you have anything other than a pic of a back panel of a speaker that is not related to the one under consideration, to suggest PE/Dayton Audio does not know how to measure speakers?
Attachments
restorer-john
Grand Contributor
I don't think you realise how much heat is produced, nor have you ever measured 200W of continuous disipation in any electronic device. We are talking about a small, floating voice coil of copper wire, not thermally coupled to anything and another even smaller voice coil (tweeter), perhaps trying to sink 10% of that (20W).
It's just not going to happen. The numbers are utter fantasy.
I think you are forgetting that a lot of the speaker driver's power goes to constantly changing the energy state of the moving mass. I asked ChatGPT to calculate this, so I don't know how correct this is...
According to this sheet, https://www.daytonaudio.com/images/resources/295-102--epique-e150he-44-spec-sheet.pdf, the speaker has about 83.3dB 1W/1M. At 200W input, this driver has about 1.5mm travel at 1kHz. Moving a 26.6gram mass at 1kHz in a sinusoidal motion 1.5mm, which is tied to the center point of travel with a spring that has a compliance of 0.6mm/N, takes 86 Watts. And these calculations are in a vacuum. Some additional work is done on the air. Again, I don't know how correct this is, but the point is that a not-insignificant amount of power is converted to mechanical energy and not dissipated as heat in the voice coil.
Dayton Audio OPAL1 Bookshelf Loudspeaker Review
Dayton Audio's OPAL1 achieves subwoofer-like bass from 5.5” woofers in a compact bookshelf speaker. Priced at $800/pair, they stand without peer for their bass performance and exceptional build quality.
www.audioholics.com
James Larson seems at least implicitly critical of Erin’s review.
How particularly?
Dayton Audio OPAL1 Bookshelf Loudspeaker Review
Dayton Audio's OPAL1 achieves subwoofer-like bass from 5.5” woofers in a compact bookshelf speaker. Priced at $800/pair, they stand without peer for their bass performance and exceptional build quality.
James Larson seems at least implicitly critical of Erin’s review.
If you don’t see it, then perhaps it’s not there.
I'm more curious what you deemed to be the differences since you posted......I'm not that interested in reviewing both in detail to ascertain specific differences you may or may not be referring to. Brief summary is fine.
OP
- Thread Starter
- #114
Dayton Audio OPAL1 Bookshelf Loudspeaker Review
Dayton Audio's OPAL1 achieves subwoofer-like bass from 5.5” woofers in a compact bookshelf speaker. Priced at $800/pair, they stand without peer for their bass performance and exceptional build quality.
James Larson seems at least implicitly critical of Erin’s review.
Not clear Larson seems specifically aimed at Erin but rather an overemphasis on speaker measurements. While I can empathize with individual preference, seems notably unhelpful from a professional reviewer. One is tempted to claim bias and seek rationalization for why he seems to be walking away from a past reputation for objectivity. No doubt though that the (glowing) AH review and Erin’s do not really align. Erin’s review is more in line with what I’d expect for his speaker.
The overall AH scoring for the Opal is out of line with some major shortcomings. One should not have to read a long review to find the reviewer bucked the measurements. If the big embedded Buy Now button does not make a consumer question the ratings credibility though, nothing else is likely to save them.
Last edited:
Velocipede_Acoustics
Member
- Joined
- Jun 8, 2021
- Messages
- 95
- Likes
- 69
I've tested this tweeter and so have others. The diffraction is the tweeter itself. The tweeter dome has a plastic cover over it to help the response, and it does. I took it off and tested and it was worse. I don't think this diffraction dip is resolvable even with a wave guide. However, it's a good sounding tweeter.
OP
- Thread Starter
- #117
The pic was too. Looks to be my bad so I deleted.
Last edited:
livinon2wheels
Active Member
- Joined
- May 3, 2024
- Messages
- 102
- Likes
- 61
If the paint is applied too tightly they end up being C#-notes
livinon2wheels
Active Member
- Joined
- May 3, 2024
- Messages
- 102
- Likes
- 61
I just bought a pair of the Opal1s to go in my kitchen when we move back home. For now I am using them as near field monitors with my computer. I think they are decent at moderate volume and have suprisingly decent bass. They are attractive and nicely finished. A bit pricey to be sure but they sound quite good.
uwotm8
Addicted to Fun and Learning
- Joined
- Jul 14, 2020
- Messages
- 589
- Likes
- 626
I actually find this one of the most adequate and reasonable judgements a good reviewer should apply to any speaker (and a consumer should keep in mind as well):
1) A mere glance at the [speaker] “spin-o-rama” curves would likely be misleading as to the tonal sense that these speakers impart in real-world listening. If I had judged it only from this graph, I would not have guessed that I would like the [speaker] as much as I did.
2) The [speakers] deserve more than a superficial analysis of measurements. This isn’t to say measurements aren’t indicative of how the speaker will sound, but rather that these need a deeper dive to get a full understanding of how they behave in real-world situations. Despite the erratic anechoic frequency responses, the [speakers] sounded good and measured well in my room, even when compared to a nearly perfect reference speaker.
That doesn't mean that any speaker with subpar measurements sound good.
But as far as all the "awfulness" happening with OPALs and some other speakers keeps within +-3 dB, one must be really not very bright to make bold statements by just looking at graphs only. "Reeee $100 Micca is better" etc
But oh wait, it sells so well nowadays
Much respect for the reviewer.
Similar threads
