the t.bone RM 700

Ribbon Microphone

  • Sensitivity: 2mV/Pa (-55dB)
  • Characteristic: Figure 8
  • Nominal impedance: 600 Ohm
  • Max. SPL: 148 dB 1% THD
  • Frequency range: 20 - 10000 Hz
  • S/N ratio: 70 dB
  • Equivalent noise level: 18 dB (A-weight)
  • Weight: 794 g
  • Dimensions: 76 x 165 mm
  • Incl. Shock mount, wooden case and aluminium case
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shockmount included Yes

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253 Customer Ratings:
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4.3 /5
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T Bone RM700 Ribbon mic - relatively average budget mic with one special trick up it's sleeve!
Cirrus, 28.01.2014
This is an interesting mic. My understanding is that they're made in China and branded with the T-Bone name for sale in the EU, and also sold in America under a different brand name.

It's a budget ribbon mic, most likely aimed at people who might have a low end condenser, a couple of '57s, and are curious about the "third kind of mic". It's very well built; despite its lollipop construction it's all metal, feels sturdy and comes with a good shock mount, wooden carry case AND a padded aluminium flight case!

As with most Ribbons, the RM700 has a figure of 8 pickup pattern which makes application and placement quite critical - it hears equally well in both directions, so the room sound is as important as the direct sound. Ribbons tend to exhibit strong proximity effect - a low end build up as you move it closer to the sound source - so care must be taken to utilise this effect well. While most ribbons have low output, the RM700 seems relatively powerful thanks to its onboard transformer, however this is at the expense of some sound quality - while most Ribbons are quite dark sounding, the RM700 is even more mellow than most, and it lacks some of the snappy low and midrange detail that more expensive Ribbons such as the Coles 4038 and Royer 121 possess. HOWEVER - given the price points, it would be churlish to compare them too much.

Ribbons tend to be very sensitive to wind blasts from vocals, kick drum holes, bass ports etc. The RM700 seems to be more rugged than most though, and is rated to withstand high SPL levels. I found that the treble can be improved by opening the mic up and removing some extra pop shields that are taped in place. However as this makes the ribbon less protected and voids the warranty I'd not recommend it unless you're feeling particularly brave!

The mic has one strength that I think makes it very worth the money: The low-mid range. While on its own it can be quite dull, I absolutely love it when paired with another mic on guitar cabs. Alongside an SM57 on a guitar speaker, the RM700 brings out a really thick but rich lower midrange that adds depth and power to clean and distorted tones. It's my go to setup for recording my Vox AC30, and has also worked wonders on higher gained rigs too.

For that reason alone I think this mic justifies its existence in my collection, and I'd recommend it to anyone looking for a second mic for guitar amp duty.
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Quality Value for money
Dev1107, 02.05.2020
Bought this to try some mid side recording on acoustic guitar
Paired with an akg ck91 .
Not the biggest signal but adds a warmth to the room sound when used as figure 8 in mid side pair.
Not perfectly balanced on both sides of the ribbon ,slightly weaker signal to the right hand side (back of mic)
But for price it works very well, I’m happy with it.
Much cheaper than the big brand alternatives.


Have not tried it for any other purpose at present.
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Really good for the pricerange and beyond
Gegginator, 26.04.2020
TBone Microphones are cheap mics that have simialar sonic capturing traits compared to the more pricey range ribbon mics. How ever, the microphone is sensitive to close range setups on guitarcabinets and are more suitable for mid range room micing of drums and guitar cabs. The mic is REALLY excellent for aquistic instruments and also as a secondary mic in a two mic vocal setup, for lower mids and bass layering to get the warm round signature even with high pass filter engaged.

I really love this mic and would easily have bought a second one if needed.
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Good starting point
Roshan, 28.01.2014
Bought this as my first ribbon mic, I had used Cascade Fatheads before so am familiar with what this type of ribbon mic can potentially be. Don't expect high frequencies from this thing, the design dictates that frequency response rolls off from just under 10kHz.

It is a very simple mic, I've had very good results using it on arco double bass where the smoothness really shines, and close in on a guitar cab which gave a lovely creamy sound.

You need a good preamp to drive it with a lot of clean gain, even then there is a fair bit of noise, I think this could be remedied by swapping the transformer for a better, shielded version. You can also mod these quite easily (I removed the inner screens) and there are quite a few places out there that will upgrade the ribbon and transformer for a reasonable fee (check out Xaudia for example).

Given the price, it's good value, you get a nice flight case and wooden box, the provided shock mount feels a little flimsy but does the job.
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$84 €75
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