Share your RoomFit curve

[Wiimer]

The sound below 47Hz is there, but it's a bit muffled. Should I add an external microphone to correct it?

You can also install the House Curve app on your iPhone and compare the measurement results from the built-in microphone with those from RoomFit.

 

[harkpabst]

Point taken. My initial bass correction was indeed based on the RoomFit analysis done by the Amp Ultra.
But that only assisted me in locating the critical frequency spot. The extent of the correction was then dictated by me.

I’ll run another RoomFit analysis with the new setup tomorrow. My guess is that the result WILL be different. We‘ll see.

I'm pretty sure that the PET1200 DM is on another level and that most certainly there can be dynamic differences, in particular when some current is really needed. Just don't over interpret initial expressions when you first plug in a new (and expensive) piece of kit. It will always sound "totally different" and "better beyond compare" ... when simply "better" is actually quite an achievement.

Once again, I'm sure that this amp is as close to the state of the art as you can get.

The sound below 47Hz is there, but it's a bit muffled. Should I add an external microphone to correct it?

By "muffled" do you mean it's still lacking level or power? Or ist it rather like it appears somehow slow and not as punchy as you would like it?

An external microphone (line e.g. the Dayton Audio iMM-6C or the miniDSP UMIK-1) will definitely yield more precise results. First because of the better quality of the microphone capsules, but probably even more so because they come with a calibration file you can upload into the WiiM Home App and because they are tailored to be used for measurements, not for recording spoken words.

The point @Wiimer made is that your iPhone mic could pick up less bass below ~47 Hz than is actually present. in this case RoomFit would attempt to further boost the bass until the measurement looks flat. A true microphone would show the real amount of low bass, which could be higher than what was measured with the iPhone mic.

To further complicate things, WiiM do attempt to compensate for known characteristics of iPhone microphones. This is in fact a microphone calibration, too, but it's not individual. It attempts to correct for a class of devices. Ironically, it is also possible that WiiM's generic iPhone calibration overestimates the loss below ~47 Hz for your individual phone, so RoomFit ends up adding too little.

The best way to get out of this dilemma is to get an external mic with individual calibration file, indeed. The iMM-6C is probably the least expensive serious contender. Get one, if you can.

Back to my initial questions:
If the bass doesn't feel lively and punchy, you might actually miss more bass in the area around 100-120 Hz (which could be muddied by "too much" bass below 60 Hz).
If you really miss the authority in extremely low bass notes (not even present in most pieces of pop music) there could be too little low bass. I think that this is less likely the case, but better measurements can reveal the truth.

PS:
HouseCurve uses a generic calibration for uPhone mics, too, but it's known to be quite accurate.

Another PS:
Since the iPhone 12 is lacking a USB-C port, you will also need the Apple camera adapter to use any USB mic.

 

[Jimmy]

我非常肯定PET1200 DM的性能遠超其他設備，而且動態表現肯定會有差異，尤其是在需要大電流輸出的時候。所以，不要過度解讀你第一次使用全新（且昂貴）設備時的第一印象。它聽起來總是「完全不同」、「無與倫比」……但實際上，「更好」本身就已經相當出色了。

我再次確信，這款擴大機已經非常接近最先進的水平了。


你說的「聲音悶悶的」是指音量或力道不夠嗎？還是說它聽起來有點慢，不夠勁爆？

使用外置麥克風（例如 Dayton Audio iMM-6C 或 miniDSP UMIK-1）肯定能獲得更精確的結果。首先是因為它們的麥克風音頭品質更好，但更重要的是，它們自帶校準文件，可以上傳到 WiiM Home 應用，而且它們是專為測量而設計的，而不是用於錄製語音。

使用者 @Wiimer 指出，iPhone 的麥克風可能無法捕捉到低於 47 Hz 的低頻，導致實際存在的低頻量不足。在這種情況下，RoomFit 會嘗試進一步提升低頻，直到測量結果看起來平直為止。而真正的麥克風能夠準確反映低頻的真實量度，其數值可能高於 iPhone 麥克風的測量結果。

更複雜的是，WiiM 會嘗試補償 iPhone 麥克風的已知特性。這其實也是一種麥克風校準，但並非針對特定設備，而是針對一類設備進行校正。諷刺的是，WiiM 的通用 iPhone 校準可能高估了您手機在 47 Hz 以下的頻率損失，導致 RoomFit 最終補償不足。

解決這個難題的最佳方法是使用帶有獨立校準文件的外置麥克風。 iMM-6C 可能是最經濟實惠的有力競爭者。如果可以的話，買一個吧。

回到我最初的問題：
如果低音感覺不夠生動有力，你可能會覺得 100-120 Hz 附近的低音不夠強勁（因為 60 Hz 以下的低音“太多”，可能會使低音變得渾濁）。
如果你真的覺得極低音（大多數流行音樂甚至不存在）缺乏力度，那可能是低音部分太少了。我認為這種情況不太可能發生，但更精確的測量可以揭示真相。

PS：
HouseCurve 也對 uPhone 麥克風使用通用校準，但眾所周知，它的精確度相當高。

附註：
由於 iPhone 12 沒有 USB-C 接口，因此要使用任何 USB 麥克風，您還需要 Apple 相機轉換器。

OK, thank you for your suggestions. I'll have a try. Thank you.

 

[Aquaman]

I'm pretty sure that the PET1200 DM is on another level and that most certainly there can be dynamic differences, in particular when some current is really needed. Just don't over interpret initial expressions when you first plug in a new (and expensive) piece of kit. It will always sound "totally different" and "better beyond compare" ... when simply "better" is actually quite an achievement.

Once again, I'm sure that this amp is as close to the state of the art as you can get.

I just ran another RoomFit analysis. This time with the Ultra and the Apollon amp.
‚

The result doesn‘t look fundementally different to that done with the Amp Ultra except for the correction peak at aroung 600-700Hz. No idea where this comes from.



Regardless, I don’t use the correction anyway.

The Apollon does handle bass substantially better than the Amp Ultra.
At first listening I didn‘t even think it sounded that much different than the WiiM. But after a few hours and playing with the EQ settings I realized its superior capabilities and that it simply sounds ‚sweet‘ (i.e. I luv it).